[{"html_arr":"

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

TCVN 2222:1977 <\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

THU\u1ed0C TH\u1eec-AXIT OXALIC Reagents -Oxalic acid<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0Axit oxalic c\u00f3 d\u1ea1ng tinh th\u1ec3 tr\u1eafng, tan trong n\u01b0\u1edbc.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0C\u00f4ng th\u1ee9c nguy\u00ean : H2C2O4 . H2O.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0C\u00f4ng th\u1ee9c c\u1ea5u t\u1ea1o : COOH<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0? . H2O<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

\u00a0COOH<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

C\u00f4ng th\u1ee9c ph\u00e2n t\u1eed : 126,07.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

1. CH\u1ec8 D\u1eaaN CHUNG. <\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665314__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.1. Thu\u1ed1c th\u1eed<\/span> s\u1eed d\u1ee5ng trong Ti\u00eau chu\u1ea9n<\/span> n\u00e0y ph\u1ea3i c\u00f3 \u0111\u1ed9 tinh khi\u1ebft t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi tinh khi\u1ebft ho\u00e1 h\u1ecdc (TKHH) ho\u1eb7c tinh khi\u1ebft ph\u00e2n t\u00edch (TKPT).<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665314__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.2.\u00a0N\u01b0\u1edbc c\u1ea5t d\u00f9ng trong Ti\u00eau chu\u1ea9n<\/span> n\u00e0y ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi TCVN 2217-77.<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665314__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.3. T\u1ea5t c\u1ea3 c\u00e1c ph\u00e9p x\u00e1c \u0111\u1ecbnh 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":"665314__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.4. Dung D\u1ecbch<\/span> so s\u00e1nh ph\u1ea3i \u0111\u01b0\u1ee3c chu\u1ea9n b\u1ecb \u0111\u1ed3ng th\u1eddi v\u1edbi dung D\u1ecbch<\/span> th\u1eed trong \u0111i\u1ec1u ki\u1ec7n ho\u00e0n to\u00e0n nh\u01b0 khi chu\u1ea9n b\u1ecb dung D\u1ecbch<\/span> th\u1eed. Khi so s\u00e1nh, \u0111\u1ed9 cao c\u1ee7a dung D\u1ecbch<\/span> trong \u1ed1ng th\u1eed v\u00e0 \u1ed1ng so s\u00e1nh ph\u1ea3i b\u1eb1ng nhau.<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665314__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.5. C\u00e1c \u1ed1ng so m\u00e0u ph\u1ea3i c\u00f3 k\u00edch th\u01b0\u1edbc b\u1eb1ng nhau, kh\u00f4ng m\u00e0u, \u0111\u00e1y ph\u1eb3ng.<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665314__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.6.\u00a0M\u1eabu \u0111\u01b0\u1ee3c l\u1ea5y sao cho kh\u1ed1i l\u01b0\u1ee3ng m\u1eabu trung b\u00ecnh kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n 500 g. M\u1eabu \u0111\u01b0\u1ee3c \u0111\u1ef1ng trong l\u1ecd kh\u00f4 k\u00edn.<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665314__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

1.7.\u00a0Dung D\u1ecbch<\/span> so s\u00e1nh trong c\u00e1c \u1ed1ng so m\u00e0u quy \u01b0\u1edbc theo s\u1ed1 th\u1ee9 t\u1ef1 nh\u01b0 sau: \u1ed1ng 1; \u1ed1ng 2; \u1ed1ng 3 t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c m\u1ee9c tinh khi\u1ebft ho\u00e1 h\u1ecdc TKHH); tinh khi\u1ebft ph\u00e2n t\u00edch ( TKPT) v\u00e0 tinh khi\u1ebft ( TK)<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 1","anchorId":"665314__khoan_1","anchorText":"Kho\u1ea3n 1 "},{"html_arr":"

2.Y\u00caU C\u1ea6U K\u1ef8 THU\u1eacT <\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 2","anchorId":"665314__khoan_2","anchorText":"Kho\u1ea3n 2 "},{"html_arr":"

Axit oxalic ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c m\u1ee9c ghi trong b\u1ea3ng:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":"

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

T\u00ean ch\u1ec9 ti\u00eau<\/span><\/span><\/p><\/td>	M\u1ee9c ( % )<\/span><\/span><\/p><\/td><\/tr>
Lo\u1ea1i TKHH<\/span><\/span><\/p><\/td>	Lo\u1ea1i TKPT<\/span><\/span><\/p><\/td>	Lo\u1ea1i TK<\/span><\/span><\/p><\/td><\/tr>
\u00a0<\/span><\/span><\/p> 1. Axit oxalic (H2C2O4 . H2O), 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. C\u1eb7n c\u00f2n l\u1ea1i sau khi nung, kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p> 4. G\u1ed1c sunfat( SO4), kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p> 5. G\u1ed1c clorua, ( Cl), kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p> 6. Nit\u01a1 ( N ) t\u1ed5ng s\u1ed1 kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p> 7. S\u1eaft, kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p> 8. Canxi (Ca), 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.Kim lo\u1ea1i n\u1eb7ng ( Pb) kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n<\/span><\/span><\/p><\/td>	\u00a0<\/span><\/span><\/p> \u00a099,8<\/span><\/span><\/p> 0,002<\/span><\/span><\/p> 0,01<\/span><\/span><\/p> 0,001<\/span><\/span><\/p> 0,001<\/span><\/span><\/p> 0,001<\/span><\/span><\/p> 0,0002<\/span><\/span><\/p> 0,002<\/span><\/span><\/p> 0,0015<\/span><\/span><\/p> 0,0002<\/span><\/span><\/p><\/td>	\u00a0<\/span><\/span><\/p> 99,0<\/span><\/span><\/p> \u00a00,005<\/span><\/span><\/p> 0,02<\/span><\/span><\/p> 0,002<\/span><\/span><\/p> 0,002<\/span><\/span><\/p> 0,002<\/span><\/span><\/p> 0,0005<\/span><\/span><\/p> 0,005<\/span><\/span><\/p> 0,003<\/span><\/span><\/p> 0,0005<\/span><\/span><\/p><\/td>	\u00a0<\/span><\/span><\/p> \u00a098,0<\/span><\/span><\/p> 0,001<\/span><\/span><\/p> 0,05<\/span><\/span><\/p> 0,025<\/span><\/span><\/p> 0,005<\/span><\/span><\/p> 0,005<\/span><\/span><\/p> 0,002<\/span><\/span><\/p> -<\/span><\/span><\/p> -<\/span><\/span><\/p> 0,001<\/span><\/span><\/p><\/td><\/tr>
11. T\u1ea1p ch\u1ea5t h\u1eefu c\u01a1<\/span><\/span><\/p><\/td>	theo m\u1ee5c 3.11<\/span><\/span><\/p><\/td><\/tr><\/table>","node_type":"","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3. PH\u01af\u01a0NG PH\u00c1P PH\u00c2N T\u00cdCH <\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" 3.1. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng axit oxalic<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__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":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" Kali pemanganat, dung D\u1ecbch<\/span> 0,1 N;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" C\u00e2n 3,16 g kali pemanganat, pha trong 1000 ml n\u01b0\u1edbc, v\u00e0 x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 chu\u1ea9n b\u1eb1ng axit oxalic \u0111\u00fang 0,1 N;<\/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":" N\u01b0\u1edbc c\u1ea5t theo TCVN 2217-77.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.1.2 C\u00e1ch ti\u1ebfn h\u00e0nh<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" C\u00e2n 0,25 g S\u1ea3n ph\u1ea9m<\/span> ch\u00ednh x\u00e1c \u0111\u1ebfn 0,0002 g, cho v\u00e0o b\u00ecnh n\u00f3n 250 ml v\u00e0 ho\u00e0 tan b\u1eb1ng 50 ml n\u01b0\u1edbc c\u1ea5t. Th\u00eam 5 ml axit sunfuric \u0111\u1eadm \u0111\u1eb7c, \u0111un n\u00f3ng h\u1ed7n h\u1ee3p \u0111\u1ebfn 70-80 0 C. Chu\u1ea9n \u0111\u1ed9 n\u00f3ng v\u1edbi dung D\u1ecbch<\/span> kali pemangatnat 0,1 N \u0111\u1ebfn khi m\u00e0u h\u1ed3ng kh\u00f4ng bi\u1ebfn m\u1ea5t sau 1 gi\u00e2y.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" H\u00e0m l\u01b0\u1ee3ng axit oxalic ( X1), t\u00ednh b\u1eb1ng ( % ), x\u00e1c \u0111\u1ecbnh theo c\u00f4ng th\u1ee9c:<\/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":" \u00a0V- th\u1ec3 t\u00edch dung D\u1ecbch<\/span> KMnO4 0,1 N d\u00f9ng \u0111\u1ec3 chu\u1ea9n \u0111\u1ed9 m\u1eabu, t\u00ednh b\u1eb1ng ml;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u00a0G- kh\u1ed1i l\u01b0\u1ee3ng m\u1eabu t\u00ednh b\u1eb1ng g;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u00a00,006303-l\u01b0\u1ee3ng axit oxalic t\u01b0\u01a1ng \u1ee9ng v\u1edbi 1 ml dung D\u1ecbch<\/span> KMnO4 O,1 N, t\u00ednh b\u1eb1ng g.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.2. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng c\u00e1c Ch\u1ea5t<\/span> kh\u00f4ng tan trong n\u01b0\u1edbc<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" C\u00e2n 50 g S\u1ea3n ph\u1ea9m<\/span> ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g, cho v\u00e0o c\u1ed1c thu\u1ef7 tinh dung t\u00edch 500 ml. Cho 400 ml n\u01b0\u1edbc c\u1ea5t \u0111\u1ec3 ho\u00e0 tan. L\u1ea5y m\u1eb7t k\u00ednh \u0111\u1ed3ng h\u1ed3 \u0111\u1eady c\u1ed1c, cho l\u00ean b\u1ebfp \u0111i\u1ec7n \u0111un s\u00f4i trong 30 ph\u00fat. L\u1ecdc b\u00e3 qua ch\u00e9n l\u1ecdc x\u1ed1p s\u1ed1 4 ( \u0111\u00e3 s\u1ea5y \u0111\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i). R\u1eeda c\u1eb7n v\u1edbi 100 ml n\u01b0\u1edbc n\u00f3ng.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" S\u1ea5y kh\u00f4 ch\u00e9n c\u00f3 c\u1eb7n \u1edf 105-1100C trong t\u1ee7 s\u1ea5y \u0111\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" S\u1ea3n ph\u1ea9m \u0111\u1ea1t ti\u00eau chu\u1ea9n, n\u1ebfu nh\u01b0 kh\u1ed1i l\u01b0\u1ee3ng ph\u1ea7n c\u1eb7n kh\u00f4ng v\u01b0\u1ee3t qu\u00e1:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" - 1 mg \u0111\u1ed1i v\u1edbi S\u1ea3n ph\u1ea9m<\/span> tinh khi\u1ebft ho\u00e1 h\u1ecdc;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" - 2,5 mg \u0111\u1ed1i v\u1edbi S\u1ea3n ph\u1ea9m<\/span> tinh khi\u1ebft ph\u00e2n t\u00edch;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" - 5 mg \u0111\u1ed1i v\u1edbi S\u1ea3n ph\u1ea9m<\/span> tinh khi\u1ebft.<\/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":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" C\u00e2n 10 g S\u1ea3n ph\u1ea9m<\/span> ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g, cho v\u00e0o ch\u00e9n s\u1ee9 ( ch\u00e9n \u0111\u00e3 \u0111\u01b0\u1ee3c nung \u0111\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i v\u00e0 c\u00e2n ch\u00ednh x\u00e1c \u0111\u1ebfn 0,002 g). \u0110\u1eb7t ch\u00e9n l\u00ean b\u1ebfp \u0111i\u1ec7n, \u0111un \u0111\u1ebfn khi bay h\u1ebft h\u01a1i axit, cho ch\u00e9n v\u00e0o L\u00f2<\/span> nung, nung \u1edf nhi\u1ec7t \u0111\u1ed9 600-700 0C trong 30 ph\u00fat. \u0110\u1ec3 ngu\u1ed9i, \u0111em c\u00e2n. Ti\u1ebfn h\u00e0nh nung v\u00e0 c\u00e2n nh\u01b0 tr\u00ean \u0111\u1ebfn khi kh\u1ed1i l\u01b0\u1ee3ng c\u1eb7n kh\u00f4ng \u0111\u1ed5i.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" S\u1ea3n ph\u1ea9m \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu kh\u1ed1i l\u01b0\u1ee3ng ph\u1ea7n c\u1eb7n c\u00f2n l\u1ea1i sau khi nung kh\u00f4ng v\u01b0\u1ee3t qu\u00e1:<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" - 1 mg \u0111\u1ed1i v\u1edbi S\u1ea3n ph\u1ea9m<\/span> tinh khi\u1ebft ho\u00e1 h\u1ecdc<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" - 2 mg \u0111\u1ed1i v\u1edbi S\u1ea3n ph\u1ea9m<\/span> tinh khi\u1ebft ph\u00e2n t\u00edch<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" - 5 mg \u0111\u1ed1i v\u1edbi S\u1ea3n ph\u1ea9m<\/span> tinh khi\u1ebft.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Ph\u1ea7n c\u1eb7n c\u00f3 th\u1ec3 gi\u1eef l\u1ea1i \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh s\u1eaft, canxi v\u00e0 magie<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.4.X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng sunfat.<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__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":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" Natri cacbonat ( Na2CO3), dung D\u1ecbch<\/span> 2 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Hydro peoxyt ( H2O2), dung D\u1ecbch<\/span> 3 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Axit clohidric, dung D\u1ecbch<\/span> 10 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Bari clorua( BaCl2), dung D\u1ecbch<\/span> 10 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Ch\u1ec9 th\u1ecb metyl \u0111\u1ecf, dung D\u1ecbch<\/span> 0,1 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Dung D\u1ecbch<\/span> sunfat Ti\u00eau chu\u1ea9n<\/span> 1 mg sunfat trong 1 ml ( dung D\u1ecbch<\/span> A) pha theo TCVN 1056-71;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Dung D\u1ecbch<\/span> B ch\u1ee9a 0,1 mg sunfat trong 1 ml, b\u1eb1ng c\u00e1ch pha lo\u00e3ng 10 l\u1ea7n dung D\u1ecbch<\/span> A.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" H\u1ed3 tinh b\u1ed9t, dung D\u1ecbch<\/span> 1 %.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.4.2. C\u00e1ch ti\u1ebfn h\u00e0nh<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" C\u00e2n 2 g s\u1ea3n ph\u1ea9m, ch\u00ednh x\u00e1c d\u1ebfn 0,01 g cho v\u00e0o b\u00e1t b\u1ea1ch kim, th\u00eam 1 ml dung D\u1ecbch<\/span> Na2CO3, 2%. \u0110\u1eb7t b\u00e1t b\u1ea1ch kim tr\u00ean b\u00ecnh c\u00e1ch thu\u1ef7 \u0111un cho bay h\u01a1i \u0111\u1ebfn kh\u00f4. Chuy\u1ec3n qua L\u00f2<\/span> nung \u0111i\u1ec7n, nung \u1edf 600-7000C \u0111\u1ebfn khi b\u00e3 trong b\u00e1t tr\u1eafng ra. \u0110\u1ec3 ngu\u1ed9i, ho\u00e0 tan b\u00e3 v\u1edbi 20 ml n\u01b0\u1edbc, n\u1ebfu \u0111\u1ee5c ti\u1ebfn h\u00e0nh l\u1ecdc, chuy\u1ec3n sang b\u00ecnh n\u00f3n 100 ml, th\u00eam 0,2 ml dung D\u1ecbch<\/span> H2O2 v\u00e0 \u0111un s\u00f4i. L\u00e0m ngu\u1ed9i dung D\u1ecbch<\/span> v\u00e0 trung ho\u00e0 b\u1eb1ng HCl theo gi\u1ea5y Ch\u1ec9 th\u1ecb<\/span> pH. Dung D\u1ecbch<\/span> thu \u0111\u01b0\u1ee3c \u0111\u01b0a v\u1ec1 25 ml cho v\u00e0o \u1ed1ng so m\u00e0u, th\u00eam 1 ml dung D\u1ecbch<\/span> HCl, 3 ml dung D\u1ecbch<\/span> h\u1ed3 tinh b\u1ed9t v\u00e0 3 ml dung D\u1ecbch<\/span> BaCl2. Sau m\u1ed7i l\u1ea7n cho Thu\u1ed1c th\u1eed<\/span> ph\u1ea3i l\u1eafc k\u1ef9.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Chu\u1ea9n b\u1ecb 3 \u1ed1ng so m\u00e0u, h\u00fat l\u1ea7n l\u01b0\u1ee3t v\u00e0o \u1ed1ng 1, \u1ed1ng 2 v\u00e0 \u1ed1ng 3 \u2013 0,2 ml; 0,4 ml v\u00e0 5 ml dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> B. Th\u00eam n\u01b0\u1edbc c\u1ea5t v\u00e0o cho v\u1eeba \u0111\u1ee7 25 ml v\u00e0 l\u1ea7n l\u01b0\u1ee3t cho v\u00e0o m\u1ed7i \u1ed1ng 1 ml dung D\u1ecbch<\/span> HCl, 3 ml dung D\u1ecbch<\/span> h\u1ed3 tinh b\u1ed9t v\u00e0 3 ml dung D\u1ecbch<\/span> BaCl2.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" S\u1ea3n ph\u1ea9m \u0111\u1ea1t ti\u00eau chu\u1ea9n, n\u1ebfu sau 30 ph\u00fat \u0111\u1ed9 \u0111\u1ee5c c\u1ee7a dung D\u1ecbch<\/span> m\u1eabu kh\u00f4ng \u0111\u1eadm h\u01a1n dung D\u1ecbch<\/span> so s\u00e1nh.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.5.X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng clo<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__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":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" \u00a0Axit nitric, dung D\u1ecbch<\/span> 25 % v\u00e0 1 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u00a0B\u1ea1c nitrat, dung D\u1ecbch<\/span> 0,1 N;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u00a0Dung D\u1ecbch<\/span> A Ti\u00eau chu\u1ea9n<\/span> ch\u1ee9a 0,1 mg clorua trong 1 ml, pha ch\u1ebf b\u1eb1ng c\u00e1ch pha lo\u00e3ng 10 l\u1ea7n dung D\u1ecbch<\/span> A.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.5.2. C\u00e1ch ti\u1ebfn h\u00e0nh<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" C\u00e2n 2 g s\u1ea3n ph\u1ea9m, ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01g, cho v\u00e0o b\u00ecnh n\u00f3n dung t\u00edch 100 ml, ho\u00e0 tan v\u1edbi 25 ml n\u01b0\u1edbc c\u1ea5t. Th\u00eam 15 ml dung D\u1ecbch<\/span> axit nitric 1 %.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Chuy\u1ec3n dung D\u1ecbch<\/span> sang \u1ed1ng so m\u00e0u, th\u00eam n\u01b0\u1edbc c\u1ea5t \u0111\u1ebfn 50 ml. Th\u00eam 1 ml dung D\u1ecbch<\/span> b\u1ea1c nitrat v\u00e0 l\u1eafc k\u1ef9.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u0110\u1ed3ng th\u1eddi chu\u1ea9n b\u1ecb 3 \u1ed1ng so m\u00e0u kh\u00e1c, l\u1ea7n l\u01b0\u1ee3t cho v\u00e0o \u1ed1ng 1, \u1ed1ng 2, \u1ed1ng 3- 0,2 ml; 0,4 ml v\u00e0 1 ml dung D\u1ecbch<\/span> B. T h\u00eam v\u00e0o m\u1ed7i \u1ed1ng so m\u00e0u 35 ml n\u01b0\u1edbc c\u1ea5t, 15 ml axit nitric 25 % v\u00e0 1ml dung D\u1ecbch<\/span> b\u1ea1c nitrat v\u00e0 l\u1eafc k\u1ef9.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Sau 20 ph\u00fat ti\u1ebfn h\u00e0nh so m\u00e0u tr\u00ean n\u1ec1n \u0111en, S\u1ea3n ph\u1ea9m<\/span> \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 dung D\u1ecbch<\/span> so s\u00e1nh.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.6.X\u00e1c \u0111\u1ecbnh nit\u01a1 t\u1ed5ng s\u1ed1<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__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":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" H\u1ee3p kim Devatda;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Natri hydroxit, dung D\u1ecbch<\/span> 20 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" N\u01b0\u1edbc c\u1ea5t kh\u00f4ng ch\u1ee9a amoni, chu\u1ea9n b\u1ecb theo ph\u1ea7n ph\u1ee5 l\u1ee5c c\u1ee7a TCVN 2217-77;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> A ch\u1ee9a 1 mg nit\u01a1 trong 1 ml- b\u1eb1ng c\u00e1ch pha lo\u00e3ng 10 l\u1ea7n dung D\u1ecbch<\/span> A.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Thu\u1ed1c th\u1eed Netle.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.6.2. C\u00e1ch ti\u1ebfn h\u00e0nh<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" C\u00e2n 2 g s\u1ea3n ph\u1ea9m, ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g, cho v\u00e0o b\u00ecnh n\u00f3n 150 ml, \u0111\u00e1y tr\u00f2n, c\u00f3 n\u00fat nh\u00e1m. Ho\u00e0 tan m\u1eabu v\u1edbi 50 ml n\u01b0\u1edbc, th\u00eam 20 ml dung D\u1ecbch<\/span> natri hydroxit 20 %, 0,5 g h\u1ed7n h\u1ee3p Devada. \u0110\u1eady ngay b\u00ecnh b\u1eb1ng n\u00fat nh\u00e1m. \u0110\u1ec3 y\u00ean 1 gi\u1edd, th\u1ec9nh tho\u1ea3ng l\u1eafc b\u00ecnh. Sau \u0111\u00f3 l\u1eafp \u1ed1ng sinh h\u00e0n v\u00e0o v\u00e0 c\u1ea5t l\u1ea5y 50 ml dung D\u1ecbch<\/span> v\u00e0o \u1ed1ng \u0111ong dung t\u00edch 100 ml \u0111\u00e3 ch\u1ee9a s\u1eb5n 10 ml n\u01b0\u1edbc c\u1ea5t.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" L\u1eafc k\u1ef9 ph\u1ea7n dung D\u1ecbch<\/span> trong \u1ed1ng \u0111o, sau \u0111\u00f3 chuy\u1ec3n v\u00e0o \u1ed1ng so m\u00e0u, th\u00eam 2 ml dung D\u1ecbch<\/span> Netle v\u00e0 l\u1eafc.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u0110\u1ed3ng th\u1eddi chu\u1ea9n b\u1ecb 3 \u1ed1ng so m\u00e0u kh\u00e1c, l\u1ea7n l\u01b0\u1ee3t cho v\u00e0o \u1ed1ng 1, \u1ed1ng 2, \u1ed1ng 3- 0,2 ml; 0,4 ml v\u00e0 1ml dung D\u1ecbch<\/span> B. Th\u00eam n\u01b0\u1edbc c\u1ea5t cho amoni \u0111\u1ebfn 60 ml, 2 ml Thu\u1ed1c th\u1eed<\/span> Netle, l\u1eafc \u0111\u1ec1u. Sau 5 ph\u00fat \u0111em so m\u00e0u.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" S\u1ea3n ph\u1ea9m \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> th\u1eed kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.7. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng s\u1eaft<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__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":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" Amoni hydroxit ( NHOH), dung D\u1ecbch<\/span> 25 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Axit clohydric, dung D\u1ecbch<\/span> 10 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> A ch\u1ee9a 1 mg ion s\u1eaft III trong 1 mk b\u1eb1ng c\u00e1h pha lo\u00e3n 10 l\u1ea7n dung D\u1ecbch<\/span> A b\u1eb1ng axit sunfuric 0,01 N<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.7.2. C\u00e1ch ti\u1ebfn h\u00e0nh<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" C\u00e2n 2 g s\u1ea3n ph\u1ea9m, ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g, cho v\u00e0o ch\u00e9n s\u1ee9. \u0110\u1eb7t ch\u00e9n l\u00ean b\u1ebfp \u0111i\u1ec7n, \u0111un c\u1ea9n th\u1eadn, sau \u0111\u00f3 cho v\u00e0o L\u00f2<\/span> nung, nung \u1edf 500-6000C trong 30 ph\u00fat. L\u1ea5y ch\u00e9n ra, \u0111\u1ec3 ngu\u1ed9i, th\u00eam 1 ml dung D\u1ecbch<\/span> axit clohidric. \u0110\u1eady ch\u00e9n b\u1eb1ng m\u1eb7t k\u00ednh \u0111\u1ed3ng h\u1ed3. \u0110un n\u00f3ng ch\u00e9n tr\u00ean b\u1ebfp c\u00e1ch thu\u1ef7 \u0111\u1ebfn khi tan h\u1ebft ph\u1ea7n c\u1eb7n.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Chuy\u1ec3n to\u00e0n B\u1ed9<\/span> dung D\u1ecbch<\/span> trong ch\u00e9n sang \u1ed1ng so m\u00e0u. Th\u00eam n\u01b0\u1edbc \u0111\u1ebfn 20 ml, th\u00eam 2 ml dung D\u1ecbch<\/span> axit sunfosalixilic. L\u1eafc c\u1ea9n th\u1eadn, th\u00eam 5 ml dung D\u1ecbch<\/span> amoni hydroxit ( NH4OH4) v\u00e0 l\u1eafc k\u1ef9.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u0110\u1ed3ng th\u1eddi chu\u1ea9n b\u1ecb 3 \u1ed1ng so m\u00e0u kh\u00e1c, l\u1ea7n l\u01b0\u1ee3t cho v\u00e0o \u1ed1ng 1, \u1ed1ng 2, \u1ed1ng 3- 0,4 ml, 1 ml v\u00e0 4ml dung D\u1ecbch<\/span> B. Th\u00eam n\u01b0\u1edbc c\u1ea5t \u0111\u1ebfn 20 ml. L\u1ea7n l\u01b0\u1ee3t th\u00eam v\u00e0o m\u1ed7i \u1ed1ng 1 ml axit clohidric, 2 ml dung D\u1ecbch<\/span> axit sunfosalixilic v\u00e0 5ml dung D\u1ecbch<\/span> amoni hydroxit v\u00e0 l\u1eafc k\u1ef9.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Ti\u1ebfn h\u00e0nh so m\u00e0u.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" S\u1ea3n ph\u1ea9m \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> th\u1eed kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.8. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng canxi<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__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":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" Axit clohidric, dung D\u1ecbch<\/span> 25 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Murexit, 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> A ch\u1ee9a 1 mg canxi trong 1ml. pha ch\u1ebf theo TCVN 1056-71;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Dung D\u1ecbch<\/span> B; pha lo\u00e3ng t\u1eeb dung D\u1ecbch<\/span> A 100 l\u1ea7n, dung D\u1ecbch<\/span> B ch\u1ee9a 0,01 g canxi \/ ml.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.8.2. C\u00e1ch ti\u1ebfn h\u00e0nh<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" C\u00e2n 5 g S\u1ea3n ph\u1ea9m<\/span> ( ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g), cho v\u00e0o ch\u00e9n b\u1ea1ch kim. \u0110un tr\u00ean b\u1ebfp \u0111i\u1ec7n \u0111\u1ebfn khi m\u1eabu \u0111\u01b0\u1ee3c ph\u00e2n hu\u1ef7 h\u1ebft. Cho v\u00e0o L\u00f2<\/span> nung, nung \u1edf 500-6000 C trong 30 ph\u00fat. \u0110\u1ec3 ngu\u1ed9i ch\u00e9n, th\u00eam 3 ml axit clohidric, cho bay h\u01a1i tr\u00ean b\u1ebfp c\u00e1ch thu\u1ef7 \u0111\u1ebfn kh\u00f4. T\u1ea9m \u01b0\u1edbt b\u00e3 trong ch\u00e9n v\u00e0o b\u00ecnh \u0111\u1ecbnh m\u1ee9c 25 ml. Tr\u00e1ng k\u1ef9 ch\u00e9n v\u00e0 g\u1ed9p chung v\u00e0o b\u00ecnh \u0111\u1ecbnh m\u1ee9c n\u00f3i tr\u00ean. Dung D\u1ecbch<\/span> M ( gi\u1eef dung D\u1ecbch<\/span> n\u00e0y \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh magie).<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" L\u1ea5y 1ml dung D\u1ecbch<\/span> M ( t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi 0,2 g s\u1ea3n ph\u1ea9m) cho v\u00e0o \u1ed1ng so m\u00e0u, th\u00eam 3 ml n\u01b0\u1edbc c\u1ea5t, 0,5 ml natri hydroxit ( NaOH) v\u00e0 0,1 ml dung D\u1ecbch<\/span> murexit. Sau m\u1ed7i l\u1ea7n th\u00eam Thu\u1ed1c th\u1eed<\/span> ph\u1ea3i l\u1eafc k\u1ef9.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u0110\u1ed3ng th\u1eddi chu\u1ea9n b\u1ecb 2 \u1ed1ng so m\u00e0u kh\u00e1c cho v\u00e0o \u1ed1ng 1, \u1ed1ng 2, l\u1ea7n l\u01b0\u1ee3t 0,4 v\u00e0 1ml dung D\u1ecbch<\/span> B, 0,5 ml dung D\u1ecbch<\/span> natri hydroxit, 0,5 ml dung D\u1ecbch<\/span> murexit v\u00e0 3 ml n\u01b0\u1edbc, l\u1eafc k\u1ef9,<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" S\u1ea3n ph\u1ea9m \u0111\u1ea1t ti\u00eau chu\u1ea9n, n\u1ebfu sau 1-2 ph\u00fat, m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> th\u1eed kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.9. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng magie<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" 3.9.1 Thu\u1ed1c th\u1eed<\/span> v\u00e0 dung d\u1ecbch<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" Natri hydroxit, 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> Ti\u00eau chu\u1ea9n<\/span> A ch\u1ee9a 1 mg Mg trong 1 ml, pha ch\u1ebf theo TCVN 1056-71;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.9.2. C\u00e1ch ti\u1ebfn h\u00e0nh<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" L\u1ea5y 1 ml dung D\u1ecbch<\/span> M ( theo M\u1ee5c<\/span> 3.8.2.), ( t\u01b0\u01a1ng \u1ee9ng v\u1edbi 0,2 g m\u1eabu), cho v\u00e0o \u1ed1ng so m\u00e0u. Th\u00eam 0,2 ml dung D\u1ecbch<\/span> Titan v\u00e0ng, 0,2 ml dung D\u1ecbch<\/span> natri hydroxit 10 %. Khi cho th\u00eam natri hydroxit ph\u1ea3i cho t\u1eeb t\u1eeb t\u1eebng gi\u1ecdt v\u00e0 l\u1eafc k\u1ef9.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u0110\u1ed3ng th\u1eddi chu\u1ea9n b\u1ecb 2 \u1ed1ng so m\u00e0u kh\u00e1c cho v\u00e0o \u1ed1ng 1, \u1ed1ng 2-0,3 v\u00e0 0,6 ml dung D\u1ecbch<\/span> B v\u00e0 cho c\u00e1c Thu\u1ed1c th\u1eed<\/span> nh\u01b0 tr\u00ean .<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Sau 15 ph\u00fat, \u0111em so m\u00e0u. S\u1ea3n ph\u1ea9m<\/span> \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> n\u1ebfu m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> th\u1eed kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.10. X\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng c\u00e1c kim lo\u1ea1i n\u1eb7ng<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" 3.10.1 Thu\u1ed1c th\u1eed<\/span> v\u00e0 dung d\u1ecbch<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" Kali natri tatrat, dung D\u1ecbch<\/span> 20 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Axit clohydric, dung D\u1ecbch<\/span> 25 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Natri hydroxit, dung D\u1ecbch<\/span> 0,5 N;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Thioaxetamit, dung D\u1ecbch<\/span> 2 %, pha d\u00f9ng ngay;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Dung D\u1ecbch<\/span> Ti\u00eau chu\u1ea9n<\/span> A ch\u1ee9a 1mg ( Pb) trong 1 ml, pha ch\u1ebf theo TCVN 1056-71;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Dung D\u1ecbch<\/span> B ch\u1ee9a 0,1 trong 1ml, pha ch\u1ebf b\u1eb1ng c\u00e1ch pha lo\u00e3ng 10 l\u1ea7n dung D\u1ecbch<\/span> A.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.10.2. C\u00e1ch ti\u1ebfn h\u00e0nh<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" C\u00e2n 5 g S\u1ea3n ph\u1ea9m<\/span> ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g cho v\u00e0o b\u00e1t s\u1ee9 150 m. \u0110\u1eb7t b\u00e1t s\u1ee9 l\u00ean b\u1ebfp c\u00e1ch thu\u1ef7 \u0111un \u0111\u1ebfn khi h\u1ebft bay h\u01a1i axit oxalic.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" T\u1ea9m \u01b0\u1edbt c\u1eb7n kh\u00f4 v\u1eeba nh\u1eadn \u0111\u01b0\u1ee3c b\u1eb1ng 2 ml axit clohydric v\u00e0 d\u00f9ng 15-20 ml n\u01b0\u1edbc n\u00f3ng tr\u00e1ng to\u00e0n B\u1ed9<\/span> v\u00e0o \u1ed1ng so m\u00e0u. Th\u00eam v\u00e0o dung D\u1ecbch<\/span> n\u00e0y 1 ml dung D\u1ecbch<\/span> kali natri tatrat, v\u00e0 trung ho\u00e0 b\u1eb1ng dung D\u1ecbch<\/span> natri hydroxit ( theo gi\u1ea5y Ch\u1ec9 th\u1ecb<\/span> m\u00e0u). Th\u00eam 2 ml dung D\u1ecbch<\/span> natri hydroxit n\u1eefa, l\u1eafc k\u1ef9, th\u00eam ti\u1ebfp 2 ml dung D\u1ecbch<\/span> thioaxetamit. L\u1eafc k\u1ef9.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u0110\u1ed3ng th\u1eddi chu\u1ea9n b\u1ecb 3 \u1ed1ng so m\u00e0u, l\u1ea7n l\u01b0\u1ee3t cho v\u00e0o \u1ed1ng 1, \u1ed1ng 2, \u1ed1ng 3- 0,1; 0,25 v\u00e0 0,5 ml dung D\u1ecbch<\/span> B. Th\u00eam n\u01b0\u1edbc c\u1ea5t \u0111\u1ebfn 25 ml v\u00e0 cho v\u00e0o m\u1ed7i \u1ed1ng 1 ml dung D\u1ecbch<\/span> kali natri tatrat, 2 ml dung D\u1ecbch<\/span> natri hydroxit v\u00e0 2 ml dung D\u1ecbch<\/span> thioaxetamit. \u0110em so m\u00e0u.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" S\u1ea3n ph\u1ea9m \u0111\u1ea1t ti\u00eau chu\u1ea9n, n\u1ebfu m\u00e0u dung D\u1ecbch<\/span> th\u1eed kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> so s\u00e1nh.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.11. X\u00e1c \u0111\u1ecbnh t\u1ea1p Ch\u1ea5t<\/span> h\u1eefu c\u01a1<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" 3.11.1. Dung D\u1ecbch<\/span> v\u00e0 Thu\u1ed1c<\/span> th\u1eed<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" Axit sunfuric, dung D\u1ecbch<\/span> 98 %;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" Coban clorua, dung D\u1ecbch<\/span> g\u1ed3m: 5,95 coban clorua v\u00e0 2,5 ml axit clohydric trong 100 ml dung d\u1ecbch;<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" \u0110\u1ed3ng sunfat, dung D\u1ecbch<\/span> ch\u1ee9a 6,24 g \u0111\u1ed3ng sunfat v\u00e0 2,5 ml axit clohydric trong 100 ml dung d\u1ecbch.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" 3.11.2. C\u00e1ch ti\u1ebfn h\u00e0nh<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 3","anchorId":"665314__khoan_3","anchorText":"Kho\u1ea3n 3 "},{"html_arr":" C\u00e2n 2 g s\u1ea3n ph\u1ea9m, ch\u00ednh x\u00e1c \u0111\u1ebfn 0,01 g, cho v\u00e0o \u1ed1ng so m\u00e0u ch\u1ecbu nhi\u1ec7t, th\u00eam 20 ml axit sunfuric, l\u1eafc c\u1ea9n th\u1eadn v\u00e0 \u0111un trong b\u00ecnh ch\u1ee9a glyx\u00earin \u1edf 150 0C trong 30 ph\u00fat.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" S\u1ea3n ph\u1ea9m \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> tinh khi\u1ebft h\u00f3a h\u1ecdc v\u00e0 tinh khi\u1ebft ph\u00e2n t\u00edch n\u1ebfu nh\u01b0 m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> m\u1eabu kh\u00f4ng \u0111\u1eadm h\u01a1n m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> axit sunfuric c\u00f9ng th\u1ec3 t\u00edch, \u0111un n\u00f3ng \u1edf 1500C trong 30 ph\u00fat.<\/p>","node_type":"text","node_type_value":"","anchorId":"","anchorText":""},{"html_arr":" S\u1ea3n ph\u1ea9m \u0111\u1ea1t Ti\u00eau chu\u1ea9n<\/span> tinh khi\u1ebft n\u1ebfu nh\u01b0 m\u00e0u c\u1ee7a dung D\u1ecbch<\/span> m\u1eabu kh\u00f4ng \u0111\u1eadm h\u01a1n, m\u00e0u c\u1ee7a h\u1ed7n h\u1ee3p dung D\u1ecbch<\/span> g\u1ed3m: 0,3 ml dung D\u1ecbch<\/span> coban clorua; 0,65 ml dung D\u1ecbch<\/span> s\u1eaft clorua v\u00e0 0,5 ml dung D\u1ecbch<\/span> \u0111\u1ed3ng sunfat trong 20 ml dung D\u1ecbch<\/span> n\u01b0\u1edbc.<\/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":"665314__khoan_4","anchorText":"Kho\u1ea3n 4 "},{"html_arr":" 4.1. Axit oxalic \u0111\u01b0\u1ee3c \u0111\u1ef1ng trong c\u00e1c chai thu\u1ef7 tinh ho\u1eb7c chai nh\u1ef1a c\u00f3 n\u00fat m\u00e0i ho\u1eb7c n\u00fat nh\u1ef1a \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 k\u00e8m theo 1 nh\u00e3n ph\u00f9 h\u1ee3p v\u1edbi Ti\u00eau chu\u1ea9n<\/span> n\u00e0y.<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 4","anchorId":"665314__khoan_4","anchorText":"Kho\u1ea3n 4 "},{"html_arr":" 4.1.1 Chai, l\u1ecd d\u00f9ng \u0111\u1ec3 \u0111\u1ef1ng Thu\u1ed1c th\u1eed<\/span> ph\u1ea3i kh\u00f4, s\u1ea1ch 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":"665314__khoan_4","anchorText":"Kho\u1ea3n 4 "},{"html_arr":" 4.2. Ghi nh\u00e3n<\/p>","node_type":"khoan","node_type_value":"Kho\u1ea3n 4","anchorId":"665314__khoan_4","anchorText":"Kho\u1ea3n 4 "},{"html_arr":" Tr\u00ean m\u1ed7i chai, l\u1ecd, \u0111\u1ef1ng axit oxalic 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 ( TKHH, TKPT ho\u1eb7c PT );<\/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 2222:1977 về thuốc thử - axit oxalic

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