[{"html_arr":"

TI\u00caU CHU\u1ea8N VI\u1ec6T NAM<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

TCVN 2221:1977 <\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

THU\u1ed0C TH\u1eec-AMONI SUNFAT Reagents Amonium sullfate<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Amoni sunfat c\u00f3 d\u1ea1ng tinh th\u1ec3 b\u1ed9t, m\u00e0u tr\u1eafng, tan trong n\u01b0\u1edbc.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0- C\u00f4ng th\u1ee9c: (NH4)2SO4<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- Kh\u1ed1i l\u01b0\u1ee3ng ph\u00e2n t\u1eed: 132,15<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

1. C\u00c1C CH\u1ec8 D\u1eaaN CHUNG <\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665313__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.1.Thu\u1ed1c th\u1eed s\u1eed d\u1ee5ng trong Ti\u00eau chu\u1ea9n<\/span> n\u00e0y, n\u1ebfu kh\u00f4ng c\u00f3 Quy \u0111\u1ecbnh<\/span> g\u00ec kh\u00e1c ph\u1ea3i c\u00f3 \u0111\u1ed9 tinh khi\u1ebft ho\u00e1 h\u1ecdc ( TK.HH) ho\u1eb7c tinh khi\u1ebft ph\u00e2n t\u00edch ( TKPT).<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665313__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.2. N\u01b0\u1edbc c\u1ea5t d\u00f9ng trong Ti\u00eau chu\u1ea9n<\/span> n\u00e0y ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi TCVN 2117-77<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665313__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.3 .T\u1ea5t c\u1ea3 c\u00e1c ph\u00e9p th\u1eed ph\u1ea3i ti\u1ebfn h\u00e0nh song song tr\u00ean hai m\u1eabu c\u00e2n<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665313__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.4. M\u1eabu \u0111\u01b0\u1ee3c l\u1ea5y nh\u01b0 th\u1ebf n\u00e0o \u0111\u00f3, sao cho kh\u1ed1i l\u01b0\u1ee3ng m\u1eabu trung b\u00ecnh kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n 700 gam. M\u1eabu \u0111\u01b0\u1ee3c \u0111\u1ef1ng trong l\u1ecd kh\u00f4, c\u00f3 n\u00fat \u0111\u1eady k\u00edn.<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665313__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

2.\u00a0Y\u00caU C\u1ea6U K\u1ef8 THU\u1eacT <\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 2","anchorId":"665313__khoan_2","anchorText":"Kho\u1ea3n 2 "},{"html_arr":"

Thu\u1ed1c th\u1eed amoni sunfat ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c y\u00eau c\u1ea7u ghi trong b\u1ea3ng sau:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

CH\u1ec8 TI\u00caU<\/span><\/span><\/b><\/p>

\u00a0<\/span><\/span><\/b><\/p><\/td>

M\u1ee9c ( t\u00ednh b\u1eb1ng % )<\/span><\/span><\/b><\/p><\/td><\/tr>

Lo\u1ea1i TK.HH<\/span><\/span><\/p><\/td>

Lo\u1ea1i TK.PT<\/span><\/span><\/p><\/td>

Lo\u1ea1i TK<\/span><\/span><\/p><\/td><\/tr>

1.Amoni sunfat, kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n<\/span><\/span><\/p>

2.C\u1eb7n kh\u00f4ng tan trong n\u01b0\u1edbc, kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

3. L\u01b0\u1ee3ng c\u00f2n l\u1ea1i sau khi nung kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

4. Nitrat (NO3), kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

5. Sunfua xianua ( CSN) kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

6. Photphat ( PO4) kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

7. Clorua ( Cl), kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

8. S\u1eaft(Fe), kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

9. Magie (Mg), kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

10. Canxi (Ca), kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

11. Asen ( As), kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

12. Kim lo\u1ea1i n\u1eb7ng ( Pb), kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p>

13. pH c\u1ee7a dung d\u1ecbch 5 %<\/span><\/span><\/p><\/td>

\u00a099,0<\/span><\/span><\/p>

\u00a00,002<\/span><\/span><\/p>

\u00a00,01<\/span><\/span><\/p>

\u00a00,001<\/span><\/span><\/p>

\u00a00,003<\/span><\/span><\/p>

0,001<\/span><\/span><\/p>

0,0003<\/span><\/span><\/p>

0,0002<\/span><\/span><\/p>

0,002<\/span><\/span><\/p>

0,00005<\/span><\/span><\/p>

0,0003<\/span><\/span><\/p>

5,0 - 6,0<\/span><\/span><\/p><\/td>

\u00a098,0<\/span><\/span><\/p>

\u00a00,005<\/span><\/span><\/p>

\u00a00,02<\/span><\/span><\/p>

\u00a00,002<\/span><\/span><\/p>

\u00a00,005<\/span><\/span><\/p>

\u00a00,002<\/span><\/span><\/p>

\u00a00,001<\/span><\/span><\/p>

\u00a00,0005<\/span><\/span><\/p>

\u00a00,005<\/span><\/span><\/p>

\u00a00,0002<\/span><\/span><\/p>

\u00a00,0005<\/span><\/span><\/p>

\u00a04,5-6,0<\/span><\/span><\/p><\/td>

\u00a097,0<\/span><\/span><\/p>

\u00a00,01<\/span><\/span><\/p>

0,05<\/span><\/span><\/p>

\u00a00,005<\/span><\/span><\/p>

\u00a00,002<\/span><\/span><\/p>

\u00a0-<\/span><\/span><\/p>

0,0005<\/span><\/span><\/p>

0,001<\/span><\/span><\/p>

\u00a04,5-6,0<\/span><\/span><\/p><\/td><\/tr><\/table>","node_type":"","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3. PH\u01af\u01a0NG PH\u00c1P TH\u1eec <\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.1. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng amoni sunfat<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.1.1 Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Natri hidroxit ( NaOH) dung D\u1ecbch<\/span> 0,5 N v\u00e0 0,1 N;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

N\u01b0\u1edbc c\u1ea5t kh\u00f4ng ch\u1ee9a cacbonic (CO2) chu\u1ea9n b\u1ecb theo TCVN 1057-71;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> phenolphtalein 1 %, theo TCVN 1057-71;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Foocmalin, dung D\u1ecbch<\/span> ( 1: 1 ) theo TCVN 1055-71;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.1.2 Ti\u1ebfn h\u00e0nh th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 1 g m\u1eabu ( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,0002 g ) cho v\u00e0o c\u1ed1c 250 ml, ho\u00e0 tan b\u1eb1ng 50 ml n\u01b0\u1edbc. Th\u00eam v\u00e0o 25 ml dung D\u1ecbch<\/span> foocmalim, 3-4 gi\u1ecdt Ch\u1ec9 th\u1ecb<\/span> phenolphtalein v\u00e0 chu\u1ea9n \u0111\u1ed9 b\u1eb1ng dung D\u1ecbch<\/span> natri hydroxit 0,5 N cho \u0111\u1ebfn khi dung D\u1ecbch<\/span> v\u1eeba chuy\u1ec3n sang m\u00e0u h\u1ed3ng nh\u1ea1t.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.1.3. T\u00ednh to\u00e1n k\u1ebft qu\u1ea3<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

H\u00e0m l\u01b0\u1ee3ng amoni sunfat ( X ), t\u00ednh b\u1eb1ng ph\u1ea7n tr\u0103m (%), x\u00e1c \u0111\u1ecbnh theo c\u00f4ng th\u1ee9c:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

trong \u0111\u00f3 :<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

V- th\u1ec3 t\u00edch natri hydroxit ti\u00eau t\u1ed1n trong ph\u00e9p chu\u1ea9n \u0111\u1ed9, t\u00ednh b\u1eb1ng ml;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

0,33035- l\u01b0\u1ee3ng amoni sunfat t\u01b0\u01a1ng \u1ee9ng v\u1edbi 1 ml natri hydroxit 0,5 N, t\u00ednh b\u1eb1ng g;<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 0,","anchorId":"665313__khoan_0","anchorText":"Kho\u1ea3n 0, "},{"html_arr":"

Sai s\u1ed1 gi\u1eefa hai l\u1ea7n x\u00e1c \u0111\u1ecbnh song song kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 0,2 % gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.2. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng c\u1eb7n kh\u00f4ng tan trong n\u01b0\u1edbc<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 50 g m\u1eabu ( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g ), cho v\u00e0o c\u1ed1c 500 ml, th\u00eam kho\u1ea3ng 300 ml n\u01b0\u1edbc n\u00f3ng v\u00e0 khu\u1ea5y cho tan m\u1eabu h\u1ebft. \u0110\u1eady c\u1ed1c b\u1eb1ng m\u1eb7t k\u00ednh \u0111\u1ed3ng h\u1ed3 v\u00e0 \u0111un c\u00e1ch thu\u1ef7 trong th\u1eddi gian kho\u1ea3ng 1 gi\u1edd. Ti\u1ebfn h\u00e0nh l\u1ecdc v\u00e0 chuy\u1ec3n to\u00e0n B\u1ed9<\/span> c\u1eb7n v\u00e0o ch\u00e9n l\u1ecdc x\u1ed1p G2 V\u00e0 G3 ( ch\u00e9n \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1ea5y \u1edf 105-1100 C \u0111\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i v\u00e0 c\u00e2n v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ebfn 0,0002 g ). R\u1eeda c\u1ed1c v\u00e0 c\u1eb7n b\u1eb1ng 100 ml n\u01b0\u1edbc n\u00f3ng.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

S\u1ea5y c\u1eb7n \u1edf 105-110 0C \u0111\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i. \u0110\u1ec3 ngu\u1ed9i ch\u00e9n trong b\u00ecnh h\u00fat \u1ea9m v\u00e0 \u0111\u00eam c\u00e2n.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Amoni sunfat \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu kh\u1ed1i l\u01b0\u1ee3ng c\u1eb7n sau khi s\u1ea5y kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc- 1,0 mg;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch- 2,5 mg;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft- 5,0 mg.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.3. X\u00e1c \u0111\u1ecbnh c\u1eb7n sau khi nung.<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 200 g m\u1eabu ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g, cho v\u00e0o ch\u00e9n platin hay ch\u00e9n s\u1ee9 50 ml ( ch\u00e9n \u0111\u00e3 \u0111\u01b0\u1ee3c nung \u1edf 6000C \u0111\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i v\u00e0 c\u00e2n v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ebfn 0,0002 g). C\u1ea9n th\u1eadn \u0111un n\u00f3ng ch\u00e9n tr\u00ean b\u1ebfp \u0111i\u1ec7n \u0111\u1ebfn khi bay h\u1ebft kh\u00f3i tr\u1eafng. Cho ch\u00e9n v\u00e0o L\u00f2<\/span> nung v\u00e0 nung \u1edf nhi\u1ec7t \u0111\u1ed9 6000C \u0111\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Amoni sunfat \u0111\u1ea1t ti\u00eau chu\u1ea9n, n\u1ebfu kh\u1ed1i l\u01b0\u1ee3ng c\u1eb7n sau khi nung kh\u00f4ng v\u01b0\u1ee3t qu\u00e1:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc- 2,0 mg;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch- 4,0 mg;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft \u2013 10,0 mg.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

C\u1eb7n c\u00f2n l\u1ea1i sau khi nung \u0111\u01b0\u1ee3c gi\u1eef l\u1ea1i \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh canxi v\u00e0 magie ( theo M\u1ee5c<\/span> 3.10 v\u00e0 3.11).<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.4. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng Nitrat<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.4.1. Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Axit sunfuric, \u0111\u1eadm \u0111\u1eb7c v\u00e0 dung D\u1ecbch<\/span> 16 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Axit clohydric \u0111\u1eb7c;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Natri clorua, dung D\u1ecbch<\/span> 5 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> indigocacmin.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

C\u00e2n 0,20 g indigocacmin ( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,001 g), cho v\u00e0o b\u00ecnh \u0111\u1ecbnh m\u1ee9c 1 lit v\u00e0 ho\u00e0 tan b\u1eb1ng 500 ml axit sunfuric 16 %. Th\u00eam v\u00e0o 20 ml axit clohydric \u0111\u1eadm \u0111\u1eb7c. Th\u00eam n\u01b0\u1edbc \u0111\u1ebfn v\u1ea1ch m\u1ee9c, v\u00e0 l\u1eafc k\u1ef9. Dung D\u1ecbch<\/span> b\u1ec1n trong th\u1eddi gian 14 ng\u00e0y.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> 1 mg NO3 \/ ml chu\u1ea9n b\u1ecb theo TCVN 1056-71. Khi d\u00f9ng pha lo\u00e3ng th\u00e0nh dung D\u1ecbch<\/span> 0,01 mg NO3\/ ML.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.4.2. Ti\u1ebfn h\u00e0nh th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 2,5 g m\u1eabu ( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g ), cho v\u00e0o \u1ed1ng so m\u00e0u 100 ml c\u00f3 v\u1ea1ch m\u1ee9c \u1edf 50 ml sau \u0111\u00f3 ho\u00e0 tan b\u1eb1ng 30 ml n\u01b0\u1edbc v\u00e0 th\u00eam n\u01b0\u1edbc \u0111\u1ebfn m\u01b0cs 50 ml. L\u1ea5y 10 ml dung D\u1ecbch<\/span> m\u1eabu ( t\u01b0\u01a1ng \u1ee9ng 0,5 g m\u1eabu) cho v\u00e0o \u1ed1ng so m\u00e0u 50 ml, th\u00eam 1ml dung D\u1ecbch<\/span> natri clorua, 1 ml dung D\u1ecbch<\/span> indigocacmin, 12 ml axit sunfuric \u0111\u1eadm \u0111\u1eb7c ( v\u1eeba th\u00eam v\u1eeba l\u1eafc). Sau 5 ph\u00fat, so m\u00e0u tr\u00ean n\u1ec1n thu\u1ef7 tinh tr\u1eafng \u0111\u1ee5c. Amoni sunfat \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u00e0u dung D\u1ecbch<\/span> m\u1eabu kh\u00f4ng nh\u1ea1t h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh g\u1ed3m:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc - 0,005 mg NO3;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch - 0,010 mg NO3;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft - 0,025 mg NO3.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

v\u00e0 10 ml n\u01b0\u1edbc, 1ml natri clorua, 1 ml dung D\u1ecbch<\/span> indigocacmin, 12 ml axit sunfuric \u0111\u1eadm \u0111\u1eb7c,th\u00eam n\u01b0\u1edbc \u0111\u1ec3 \u0111\u1ed9 cao dung D\u1ecbch<\/span> trong \u1ed1ng m\u1eabu v\u00e0 \u1ed1ng so s\u00e1nh b\u1eb1ng nhau.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.5. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng sunfua xianua<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.5.1. Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Ph\u00e8n s\u1eaft-amoni sunfat, dung D\u1ecbch<\/span> B\u00e3o<\/span> ho\u00e0 trong n\u01b0\u1edbc;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Axit sunfuric, dung D\u1ecbch<\/span> 16 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Natri sunfat khan c\u00f3 h\u00e0m l\u01b0\u1ee3ng sunfoxianua (CSN) nh\u1ecf h\u01a1n 10-5 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> 1 mg CSN \/ml pha ch\u1ebf theo TCVN 1056-71, khi d\u00f9ng pha th\u00e0nh dung D\u1ecbch<\/span> ph\u00e8n s\u1eaft v\u00e0 l\u1eafc k\u1ef9,( \u0111un n\u00f3ng).<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Amoni sunfat \u0111\u1ea1t ti\u00eau chu\u1ea9n, n\u1ebfu m\u00e0u \u0111\u1ecf n\u00e2u c\u1ee7a dung D\u1ecbch<\/span> m\u1eabu kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh g\u1ed3m:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc- 0,3 mg CSN;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch- 0,5 mg CSN;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft - 0,5 mg CSN;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Th\u00eam 10 g natri sunfat v\u00e0 \u0111un n\u00f3ng \u0111\u1ebfn tan c\u00e1c tinh th\u1ec3 mu\u1ed1i. Th\u00eam 0,5 ml dung D\u1ecbch<\/span> axit sunfuric, \u0111\u1ec3 ngu\u1ed9i. Th\u00eam 0,5 ml dung D\u1ecbch<\/span> ph\u00e8n s\u1eaft v\u00e0 th\u00eam n\u01b0\u1edbc c\u1ea5t d\u1ec3 \u0111\u1ed9 cao dung D\u1ecbch<\/span> trong hai \u1ed1ng b\u1eb1ng nhau.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.6. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng photphat<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.6.1. Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Natri sunfit khan, dung D\u1ecbch<\/span> 10 % b\u1ea3o qu\u1ea3n trong l\u1ecd n\u00e2u, k\u00edn, dung D\u1ecbch<\/span> b\u1ec1n trong th\u1eddi gian ba tu\u1ea7n;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Axit sunfit khan, dung D\u1ecbch<\/span> 10 % b\u1ea3o qu\u1ea3n trong l\u1ecd n\u00e2u, k\u00edn , dung D\u1ecbch<\/span> b\u1ec1n trong th\u1eddi gian 3 tu\u1ea7n;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Axit clohydric, dung D\u1ecbch<\/span> 1:2;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Amoni hydroxit, dung D\u1ecbch<\/span> 1:1;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Amoni molipdat, dung D\u1ecbch<\/span> 5 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

C\u00e2n 25 g amoni molipdat, cho v\u00e0o c\u1ed1c dung t\u00edch 500 ml, ho\u00e0 tan v\u1edbi 300 ml n\u01b0\u1edbc v\u00e0 \u0111un s\u00f4i. N\u1ebfu dung D\u1ecbch<\/span> \u0111\u1ee5c th\u00ec l\u1ecdc, sau \u0111\u00f3 th\u00eam n\u01b0\u1edbc \u0111\u1ebfn 500 ml.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Ph\u00e8n s\u1eaft ( III ) amoni ( s\u1eaft ( III )- amoni sunfat)<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

C\u00e2n 110 g ph\u00e8n s\u1eaft amoni v\u00e0o c\u1ed1c 500 ml, th\u00eam v\u00e0o 10 ml axit clohidric ( 1:2) v\u00e0 th\u00eam \u0111\u1ebfn 500 ml.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> 1 mg PO4\/ ml theo TCVN 1056-71, khi d\u00f9ng pha lo\u00e3ng th\u00e0nh dung D\u1ecbch<\/span> 0,05 mg PO4\/ ml.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.6.2 Ti\u1ebfn h\u00e0nh th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 10 g m\u1eabu ( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g ) cho v\u00e0o \u1ed1ng so m\u00e0u 50 ml, th\u00eam 20 ml n\u01b0\u1edbc v\u00e0 l\u1eafc cho tan m\u1eabu. Th\u00eam 2 ml dung D\u1ecbch<\/span> ph\u00e8n s\u1eaft v\u00e0 trung ho\u00e0 b\u1eb1ng dung D\u1ecbch<\/span> amoni hidroxit. Ho\u00e0 tan k\u1ebft t\u1ee7a b\u1eb1ng m\u1ed9t v\u00e0i gi\u1ecdt axit clohidric v\u00e0 cho th\u00eam 1 ml n\u1eefa. Sau \u0111\u00f3 th\u00eam 2 ml dung D\u1ecbch<\/span> natri sunfit v\u00e0 \u0111un c\u00e1ch thu\u1ef7 2 ph\u00fat. L\u00e0m l\u1ea1nh dung D\u1ecbch<\/span> , th\u00eam 3 ml dung D\u1ecbch<\/span> axit clohidric ( v\u1eeba th\u00eam t\u1eebng gi\u1ecdt v\u1eeba l\u1eafc), 2 ml dung D\u1ecbch<\/span> amoni molipdat. Th\u00eam n\u01b0\u1edbc \u0111\u1ebfn v\u1ea1ch m\u1ee9c, l\u1eafc \u0111\u1ec1u. Sau 5 ph\u00fat so m\u00e0u tr\u00ean n\u1ec1n thu\u1ef7 tinh tr\u1eafng \u0111\u1ee5c. Amoni sunfat \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> m\u1eabu nh\u1ea1t h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh \u0111\u01b0\u1ee3c chu\u1ea9n b\u1ecb \u0111\u1ed3ng th\u1eddi v\u00e0 g\u1ed3m:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc- 0,5 mg PO4;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch -0,100 mg PO4;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft- 0,200 mg PO4;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

v\u00e0 ti\u1ebfn h\u00e0nh nh\u01b0 khi chu\u1ea9n b\u1ecb dung D\u1ecbch<\/span> m\u1eabu t\u1eeb giai \u0111o\u1ea1n cho th\u00eam ph\u00e8n s\u1eaft.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.7. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng clorua<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.7.1. Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Axit nitric, dung D\u1ecbch<\/span> 0,1 N;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

B\u1ea1c nitrat, dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> 1 mg Cl\/ ml theo TCVN 1056-71.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Khi d\u00f9ng pha lo\u00e3ng 2,5 l\u1ea7n th\u00e0nh dung D\u1ecbch<\/span> 0,4 ml Cl\/ml.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.7.2. Ti\u1ebfn h\u00e0nh th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 4 g m\u1eabu( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g), cho v\u00e0o \u1ed1ng so m\u00e0u 50 ml, th\u00eam 30 ml n\u01b0\u1edbc v\u00e0 l\u1eafc cho tan m\u1eabu. Th\u00eam 2 ml dung D\u1ecbch<\/span> axit n\u1ec9tic, 1 ml dung D\u1ecbch<\/span> b\u1ea1c nitrat v\u00e0 l\u00e1c \u0111\u1ec1u. Sau 20 ph\u00fat so m\u1ea7u tr\u00ean n\u1ec1n thu\u1ef7 tinh \u0111en. Amoni sunfat \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu dung D\u1ecbch<\/span> m\u1eabu kh\u00f4ng \u0111\u1ee5c h\u01a1n dung D\u1ecbch<\/span> so s\u00e1nh; dung D\u1ecbch<\/span> so s\u00e1nh \u0111\u01b0\u1ee3c chu\u1ea9n b\u1ecb \u0111\u1ed3ng th\u1eddi v\u00e0 g\u1ed3m:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc- 0,012 mg Cl;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch- 0,040 mg Cl;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft- 0,080 mg Cl,<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

v\u00e0 30 ml n\u01b0\u1edbc c\u1ea5t, 2 ml dung D\u1ecbch<\/span> axit nitric, 1 ml dung D\u1ecbch<\/span> b\u1ea1c nitrat.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.8. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng s\u1eaft<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.8.1. Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Axit ascobic ho\u1eb7c hidroxylamin, dung D\u1ecbch<\/span> 10 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u0110\u1ec7m axetat- l\u1ea5y 500 ml dung D\u1ecbch<\/span> axetic \u0111\u1eb7c tr\u1ed9n v\u1edbi 10 ml natri axetat 2 M;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Axit clohidric, dung D\u1ecbch<\/span> 25 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Phenolphtalein, dung D\u1ecbch<\/span> 0,1 % trong R\u01b0\u1ee3u<\/span> etylic;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> 1 mg Fe\/ ml theo TCVN 1056-71, khi d\u00f9ng pha th\u00e0nh dung D\u1ecbch<\/span> 0,04 mg Fe\/ ml.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.8.1.2 Ti\u1ebfn h\u00e0nh th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 2 g m\u1eabu ( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g ), cho v\u00e0o \u1ed1ng so m\u00e0u 50 ml, th\u00eam 20 ml n\u01b0\u1edbc, 1 ml dung D\u1ecbch<\/span> axit clohidric v\u00e0 \u0111un c\u00e1ch thu\u1ef7 trong th\u1eddi gian 20 ph\u00fat. L\u00e0m l\u1ea1nh dung d\u1ecbch, th\u00eam 2 ml dung D\u1ecbch<\/span> axit ascobic, 1 gi\u1ecdt dung D\u1ecbch<\/span> phenolphtalein v\u00e0 d\u00f9ng amoni hydroxit 25 % trung ho\u00e0 \u0111\u1ebfn v\u1eeba m\u1ea5t m\u00e0u h\u1ed3ng. Th\u00eam 5 ml dung D\u1ecbch<\/span> a-a\ufffd dipyridin, 5 ml dung D\u1ecbch<\/span> \u0111\u1ec7m axetat v\u00e0 th\u00eam n\u01b0\u1edbc c\u1ea5t \u0111\u1ebfn v\u1ea1ch 50 ml. Sau 30 ph\u00fat \u0111\u00eam so m\u00e0u.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Amoni sunfat \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> m\u1eabu kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh, dung D\u1ecbch<\/span> so s\u00e1nh \u0111\u01b0\u1ee3c chu\u1ea9n b\u1ecb \u0111\u1ed3ng th\u1eddi v\u1edbi dung D\u1ecbch<\/span> m\u1eabu v\u00e0 g\u1ed3m:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc- 0,004 mg Fe;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch- 0,010 mg Fe;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft- 0,020 mg Fe;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

v\u00e0 ti\u1ebfn h\u00e0nh nh\u01b0 \u0111\u1ed1i v\u1edbi dung D\u1ecbch<\/span> m\u1eabu t\u1eeb ph\u1ea7n th\u00eam dung D\u1ecbch<\/span> axit ascobic.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.8.2. X\u00e1c \u0111\u1ecbnh s\u1eaft theo axit sufoxalisilic<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.8.2.1 Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Amoni hidroxit, dung D\u1ecbch<\/span> 25 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Kali pemanganat, dung D\u1ecbch<\/span> 0,85 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Axit clohydric \u0111\u1eadm \u0111\u1eb7c;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Axit sunfoxalisilic, dung D\u1ecbch<\/span> 10 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> s\u1eaft Ti\u00eau chu\u1ea9n<\/span> theo 3.8.1.1.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.8.2.2 Ti\u1ebfn h\u00e0nh th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 2 g m\u1eabu( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01g ) v\u00e0 cho v\u00e0o \u1ed1ng so m\u00e0u 50 ml, th\u00eam 20 ml n\u01b0\u1edbc, 1 ml axit clohidric v\u00e0 \u0111un c\u00e1ch thu\u1ef7 trong th\u1eddi gian 2 ph\u00fat. \u0110\u1ec3 ngu\u1ed9i dung d\u1ecbch, th\u00eam 2 ml dung D\u1ecbch<\/span> axit sunfoxalisilic, l\u1eafc \u0111\u1ec1u v\u00e0 th\u00eam 5 ml dung D\u1ecbch<\/span> amoni hydroxit, th\u00eam n\u01b0\u1edbc \u0111\u1ebfn v\u1ea1ch m\u1ee9c v\u00e0 l\u1eafc k\u1ef9.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Sau 10 ph\u00fat m\u1eadt \u0111\u1ed9 quang tr\u00ean m\u00e1y FEK \u2013 M, d\u00f9ng K\u00ednh l\u1ecdc<\/span> m\u00e0u ch\u00e0m ( s\u1ed1 3) v\u00e0 cuvet d\u00e0y 5 cm, th\u00eam cuvet b\u1ed5 sung s\u00e1t v\u1edbi k\u00ednh l\u1ecdc. D\u00f9ng n\u01b0\u1edbc c\u1ea5t l\u00e0m dung dc\u1ecbh so s\u00e1nh.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Amoni hidroxit \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u1eadt \u0111\u1ed9 quang c\u1ee7a dung D\u1ecbch<\/span> m\u1eabu kh\u00f4ng l\u1edbn h\u01a1n m\u1eadt \u0111\u1ed9 quang c\u1ee7a dung D\u1ecbch<\/span> m\u1eabu kh\u00f4ng l\u1edbn h\u01a1n m\u1eadt \u0111\u1ed9 quang c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh g\u1ed3m:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0-lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc- 0,004 mg Fe;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0-lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch- 0,010 mg Fe;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0-lo\u1ea1i tinh khi\u1ebft- 0,020 mg Fe;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

v\u00e0 ti\u1ebfn h\u00e0nh nh\u01b0 \u0111\u1ed1i v\u1edbi dung D\u1ecbch<\/span> m\u1eabu t\u1eeb ph\u1ea7n th\u00eam dung D\u1ecbch<\/span> axit clohidric.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.9. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng canxi<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.9.1. Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Axit clohydric, dung D\u1ecbch<\/span> 25 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Murexit, dung dc\u1ecbh 0,5 %, b\u1ec1n trong 2 ng\u00e0y;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Natri hydroxit, dung D\u1ecbch<\/span> 1 N;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> 1 mg Ca\/ ml theo TCVN 1056-71; khi d\u00f9ng pha lo\u00e3ng th\u00e0nh dung D\u1ecbch<\/span> 0,01 mg Ca\/ mg.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.9.2. Ti\u1ebfn h\u00e0nh th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u1eb7n sau khi nung( theo M\u1ee5c<\/span> 3.3), th\u00eam v\u00e0o 1 ml dung D\u1ecbch<\/span> axit clohidric, 10 ml n\u01b0\u1edbc v\u00e0 \u0111un c\u00e1ch thu\u1ef7 cho \u0111\u1ebfn khi c\u1eb7n tan h\u1ebft. Th\u00eam n\u01b0\u1edbc \u0111\u1ebfn 100 ml, ta \u0111\u01b0\u1ee3c dung D\u1ecbch<\/span> A d\u00f9ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh canxi v\u00e0 magie.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

D\u00f9ng pipet kh\u1eafc \u0111\u1ed9 l\u1ea5y 2,5 ml dung D\u1ecbch<\/span> A (t\u01b0\u01a1ng \u1ee9ng v\u1edbi 0,5 g m\u1eabu), cho v\u00e0o \u1ed1ng so m\u00e0u 50 ml, th\u00eam 5,5 ml n\u01b0\u1edbc c\u1ea5t, 1 ml dung D\u1ecbch<\/span> natri hydroxit, l\u1eafc \u0111\u1ec1u. Th\u00eam ti\u1ebfp 1 ml dung D\u1ecbch<\/span> murexit v\u00e0 l\u1eafc \u0111\u1ec1u. Sau 2 ph\u00fat so m\u00e0u tr\u00ean n\u1ec1n thu\u1ef7 tinh tr\u1eafng \u0111\u1ee5c.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Amoni sunfat \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u00e0u t\u00edm h\u1ed3ng c\u1ee7a dung D\u1ecbch<\/span> m\u1eabu nh\u1ea1t h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh g\u1ed3m:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc \u2013 0,010 mg Ca;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch- 0,025 ng Ca;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

v\u00e0 1 ml dung D\u1ecbch<\/span> natri hydroxit, 1ml dung D\u1ecbch<\/span> murexit v\u00e0 th\u00eam n\u01b0\u1edbc \u0111\u1ec3 \u0111\u1ed9 caoc\u1ee7a dung D\u1ecbch<\/span> trong \u1ed1ng so s\u00e1nh v\u00e0 \u1ed1ng m\u1eabu b\u1eb1ng nhau.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

M\u00e0u c\u1ee7a dung D\u1ecbch<\/span> b\u1ec1n trong 10 ph\u00fat.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.10. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng magie<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.10.1. Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Natri hidroxit, dung D\u1ecbch<\/span> 10 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Titan v\u00e0ng, dung D\u1ecbch<\/span> 0,05%;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> magie Ti\u00eau chu\u1ea9n<\/span> 1 mg Mg\/ ml theo TCVN 1056-71.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Khi d\u00f9ng pha lo\u00e3ng th\u00e0nh dung D\u1ecbch<\/span> 0,005 mg Mg\/ ml.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.10.2. Ti\u1ebfn h\u00e0nh th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

D\u00f9ng pipet kh\u1eafc \u0111\u1ed9 l\u1ea5y 7,5 ml dung D\u1ecbch<\/span> A, cho v\u00e0o \u1ed1ng so m\u00e0u 50 ml, th\u00eam 0,2 ml dung D\u1ecbch<\/span> titan v\u00e0ng, 2 ml dung D\u1ecbch<\/span> natri hydroxit v\u00e0 l\u1eafc k\u1ef9.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Sau 10 ph\u00fat so m\u00e0u tr\u00ean n\u1ec1n thu\u1ef7 tinh tr\u1eafng \u0111\u1ee5c. Amoni sunfat \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u00e0u h\u1ed3ng c\u1ee7a dung dc\u1ecbh m\u1eabu kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh g\u1ed3m:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh kh\u1ebft ho\u00e1 h\u1ecdc- 0,0030 mg Mg;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh kh\u1ebft ph\u00e2n t\u00edch \u2013 0,0075 mg Mg;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

v\u00e0 0,2 ml dung D\u1ecbch<\/span> titan v\u00e0ng, 2 ml natri hidroxit v\u00e0 th\u00eam n\u01b0\u1edbc \u0111\u1ec3 \u0111\u1ed9 cao dung D\u1ecbch<\/span> trong \u1ed1ng m\u1eabu v\u00e0 \u1ed1ng so s\u00e1nh b\u1eb1ng nhau.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.11 X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng asen<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.11.1. Dung d\u1ecbch, Thu\u1ed1c th\u1eed<\/span> v\u00e0 d\u1ee5ng c\u1ee5<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Ch\u00ec axetat, dung D\u1ecbch<\/span> 5 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Thi\u1ebfc (II) clorua, dung D\u1ecbch<\/span> 10 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Axit sunfuric \u0111\u1eadm \u0111\u1eb7c, d= 1,84;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Thu\u1ef7 ng\u00e2n II bromua, dung D\u1ecbch<\/span> 1%;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> asen Ti\u00eau chu\u1ea9n<\/span> 1 mg As\/ ml theo TCVN 1056-71, khi d\u00f9ng pha th\u00e0nh 0,001 mg As\/ ml.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

K\u1ebdm kim lo\u1ea1i h\u1ea1t \u0111\u1ed3ng \u0111\u1ec1u c\u00f3 h\u00e0m l\u01b0\u1ee3ng asen nh\u1ecf h\u01a1n 10-5 %.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Gi\u1ea5y t\u1ea9m dung D\u1ecbch<\/span> ch\u00ec axetat theo TCVN 1055-71;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

B\u00f4ng th\u1ea5m n\u01b0\u1edbc, t\u1ea9m dung D\u1ecbch<\/span> ch\u00ec axetat, \u0111\u01b0\u1ee3c s\u1ea5y kh\u00f4 v\u00e0 \u0111\u1ef1ng trong l\u1ecd c\u00f3 n\u00fat \u0111\u1eady k\u00edn;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Gi\u1ea5y t\u1ea9m thu\u1ef7 ng\u00e2n (II) bromua theo TCVN 1055-71;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

D\u1ee5ng c\u1ee5 x\u00e1c \u0111\u1ecbnh asen (theo h\u00ecnh v\u1ebd)<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.11.2. Ti\u1ebfn h\u00e0nh th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 10 g m\u1eabu( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g) cho v\u00e0o c\u1ed1c 250 ml, th\u00eam 40 ml n\u01b0\u1edbc c\u1ea5t v\u00e0 khu\u1ea5y cho tan m\u1eabu. Sau \u0111\u00f3 th\u00eam n\u01b0\u1edbc \u0111\u1ebfn 50 ml ( c\u1ed1c c\u00f3 v\u1ea1ch m\u1ee9c 50 ml).<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

L\u1ea5y 10 ml dung D\u1ecbch<\/span> m\u1eabu( t\u01b0\u01a1ng \u1ee9ng 2 g m\u1eabu) cho v\u00e0o b\u00ecnh ph\u1ea3n \u1ee9ng, th\u00eam 20 ml n\u01b0\u1edbc c\u1ea5t, 0,5 ml dung D\u1ecbch<\/span> thi\u1ebfc ( II) clorua, 20 ml dung D\u1ecbch<\/span> axit sunfuric, 5 g k\u1ebdm h\u1ea1t. Nhanh ch\u00f3ng l\u1eafp D\u1ee5ng c\u1ee5<\/span> x\u00e1c \u0111\u1ecbnh asen v\u00e0o b\u00ecnh ph\u1ea3n \u1ee9ng.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Sau 1 gi\u1edd 30 ph\u00fat, so m\u00e0u gi\u1ea5y v\u00e0ng c\u1ee7a dung D\u1ecbch<\/span> th\u1eed v\u00e0 dung D\u1ecbch<\/span> so s\u00e1nh \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh song song \u1edf D\u1ee5ng c\u1ee5<\/span> x\u00e1c \u0111\u1ecbnh asen th\u1ee9 2 g\u1ed3m:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

-lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc- 0,001 mg As;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

-lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch- 0,004 mg As;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

-lo\u1ea1i tinh khi\u1ebft- 0,01 mg As;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

v\u00e0 c\u00e1c Thu\u1ed1c th\u1eed<\/span> nh\u01b0 tr\u00ean, th\u1ec3 t\u00edch dung D\u1ecbch<\/span> th\u1eed v\u00e0 dung D\u1ecbch<\/span> so s\u00e1nh trong 2 b\u00ecnh ph\u1ea3n \u1ee9ng b\u1eb1ng nahu.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Amoni sunfat \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u00e0u v\u00e0ng c\u1ee7a gi\u1ea5y t\u1ea9m thu\u1ef7 ng\u00e2n bromua trong b\u00ecnh th\u1eed kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u v\u00e0ng c\u1ee7a gi\u1ea5y t\u1ea9m thu\u1ef7 ng\u00e2n bromua trong b\u00ecnh so s\u00e1nh.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.12. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng kim lo\u1ea1i n\u1eb7ng<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

3.12.1.Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

Kali hidroxit, dung D\u1ecbch<\/span> 10 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Kali-natri tatrat, dung D\u1ecbch<\/span> 20 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Thioaxetamit, dung D\u1ecbch<\/span> 2 %, b\u1ec1n trong 3 ng\u00e0y;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> 1 mg Pb\/ ml, theo TCVN 1056-71, khi d\u00f9ng pha th\u00e0nh dung D\u1ecbch<\/span> 0,005 mg Pb\/ ml.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.12.2. Ti\u1ebfn h\u00e0nh th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 6,6 g m\u1eabu( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g) cho v\u00e0o \u1ed1ng so m\u00e0u 50 ml, ho\u00e0 tan b\u1eb1ng 30 ml n\u01b0\u1edbc. Th\u00eam v\u00e0o 2 ml dung D\u1ecbch<\/span> kali hidroxit, 2 ml dung D\u1ecbch<\/span> axetamit v\u00e0 th\u00eam n\u01b0\u1edbc \u0111\u1ebfn v\u1ea1ch m\u1ee9c. Sau 10 ph\u00fat so m\u00e0u tr\u00ean n\u1ec1n thu\u1ef7 tinh tr\u1eafng \u0111\u1ee5c. Amoni sunfat \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ec1n thu\u1ef7 tinh tr\u1eafng \u0111\u1ee5c. Amoni sunfat \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u1ea7u \u0111en c\u1ee7a dung D\u1ecbch<\/span> th\u1eed kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u \u0111en c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh, dung D\u1ecbch<\/span> so s\u00e1nh \u0111\u01b0\u1ee3c chu\u1ea9n b\u1ecb \u0111\u1ed3ng th\u1eddi v\u1edbi dung D\u1ecbch<\/span> m\u1eabu v\u00e0 g\u1ed3m:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ho\u00e1 h\u1ecdc- 0,018 mg Pb;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft ph\u00e2n t\u00edch- 0,030 mg Pb;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

- lo\u1ea1i tinh khi\u1ebft \u2013 0,060 mg Pb;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

v\u00e0 ti\u1ebfn h\u00e0nh nh\u01b0 tr\u00ean t\u1eeb ph\u1ea7n cho dung D\u1ecbch<\/span> kali-natri tatrat.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

3.13. X\u00e1c \u0111\u1ecbnh pH c\u1ee7a dung D\u1ecbch<\/span> 5 %<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665313__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":"

C\u00e2n 5 g m\u1eabu( v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g ) cho v\u00e0o b\u00ecnh c\u1ea7u 200 ml, ho\u00e0 tan v\u1edbi 95 ml n\u01b0\u1edbc c\u1ea5t kh\u00f4ng ch\u1ee9a cacbonic ( CO2). Ti\u1ebfn h\u00e0nh \u0111o pH c\u1ee7a dung D\u1ecbch<\/span> tr\u00ean pHmet v\u1edbi \u0111i\u1ec7n c\u1ef1c thu\u1ef7 tinh.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

4.BAO G\u00d3I V\u00c0 GHI NH\u00c3N <\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 4","anchorId":"665313__khoan_4","anchorText":"Kho\u1ea3n 4 "},{"html_arr":"

Amoni sunfat \u0111\u01b0\u1ee3c \u0111\u1ef1ng trong c\u00e1c chai thu\u1ef7 tinh c\u00f3 n\u00fat m\u00e0i ho\u1eb7c chai nh\u1ef1a c\u00f3 n\u00fat xo\u00e1y \u0111\u1eady k\u00edn. Kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng b\u00ec m\u1ed7i chai 0,5; 1 ; 1,5 kg m\u1ed7i chai d\u00e1n k\u00e8m theo 1 nh\u00e3n ph\u00f9 h\u1ee3p v\u1edbi ti\u00eauc chu\u1ea9n n\u00e0y.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

4.1. Chai d\u00f9ng \u0111\u1ec3 \u0111\u1ef1ng Thu\u1ed1c th\u1eed<\/span> ph\u1ea3i kh\u00f4, s\u1ea1ch v\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn Ch\u1ea5t<\/span> l\u01b0\u1ee3ng c\u1ee7a Thu\u1ed1c<\/span> th\u1eed.<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 4","anchorId":"665313__khoan_4","anchorText":"Kho\u1ea3n 4 "},{"html_arr":"

4.2. Ghi nh\u00e3n<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 4","anchorId":"665313__khoan_4","anchorText":"Kho\u1ea3n 4 "},{"html_arr":"

Tr\u00ean m\u1ed7i chai \u0111\u1ef1ng amnoi sunfat ph\u1ea3i d\u00e1n nh\u00e3n, ghi r\u00f5:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

T\u00ean B\u1ed9<\/span> ho\u1eb7c T\u1ed5ng c\u1ee5c,<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

T\u00ean x\u00ed nghi\u1ec7p s\u1ea3n xu\u1ea5t,<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u0110\u1ecba ch\u1ec9 x\u00ed nghi\u1ec7p s\u1ea3n xu\u1ea5t,<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

T\u00ean Thu\u1ed1c th\u1eed<\/span> v\u00e0 c\u00f4ng th\u1ee9c ho\u00e1 h\u1ecdc,<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

M\u1ee9c \u0111\u1ed9 tinh khi\u1ebft ( TK-HH; TK-PT; TK)<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

C\u00e1c ch\u1ec9 ti\u00eau Ch\u1ea5t<\/span> l\u01b0\u1ee3ng,<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

Kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng b\u00ec.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""}]

Tiêu chuẩn Việt Nam TCVN 2221:1977 về thuốc thử - amoni sunfat

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