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.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2002年第4期470-472,共3页
Chinese Journal of Analytical Chemistry
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
2-(2-arsonophenylazo)-7-(2,6-diiodo-4-nitrophenylazo)-1,8-dihydroxynaphthalene-3
6-disulfonic acid
spectrophotometry
bismuth
copper alloy
