2,6-二碘-4-硝基偶氮胂分光光度法测定微量铋  

Spectrophotometric Determination of Microamounts of Bismuth with 2,6-Diiodo-4-nitroarsenazo

作　　者：黄文胜[1] 王红[1] 张军锋[1] 张华山[1] 

机构地区：[1]武汉大学化学系

出　　处：《分析化学》2002年第4期470-472,共3页Chinese Journal of Analytical Chemistry

摘　　要：研究了显色剂 2 (2 胂酸基苯偶氮 ) 7 (2 ,6 二碘 4 硝基苯偶氮 ) 1,8 二羟基 3,6 萘二磺酸与铋的显色反应。在 0 .6mol LHClO4 介质中 ,试剂与铋生成的深色络合物 ,最大吸收波长 6 33nm ,摩尔吸光系数为1 2 0× 10 5L·mol- 1 ·cm- 1 ,灵敏度高 ,常见的金属离子允许量大 ,选择性好。Bi 0～ 0 .8mg L范围内符合比耳定律 ,以NaCl褪色试样空白为参比 ,分光光度法测定纯铜及铜合金中的微量铋 ,方法简便 。A sensitive chromogenic reagent, 2-(2-arsonophenylazo)-7-(2,6-diiodo-4-nitrophenylazo)-1, 8-dihydroxynaphthalene-3,6-disulfonic acid (abbreviation: 2,6-diiodo-4-nitroarsenazo) I has been used in the spectrophotometric determination of bismuth. In 0.6 mol/L HClO4, the reagent reacts with bismuth(III) to form a deep colour complex with a maximum absorption at 633 nm. The apparent molar absorptivity is 1.20 x 10(5) L.mol(-1).cm(-1). Beer's law is obeyed over the bismuth concentration range 0similar to0.8 mg/L. Most of macroamounts of foreign ions do not interfere. The proposed method has been applied to the determination of bismuth in copper alloys without prior treatment with satisfactory results.

关 键 词：2 6-二碘-4-硝基偶氮胂 分光光度法 测定 微量分析 铋 纯铜 铜合金 

分 类 号：O657.3[理学—分析化学]