摘要
研究了铬（Ⅲ）与偶氮胂Ⅲ（ＡＳＡⅢ）的显色反应。在ｐＨ２８的邻苯二甲酸氢钾ＨＣｌ缓冲溶液中，铬（Ⅲ）与ＡＳＡ（Ⅲ）形成蓝色配合物，其最大吸收峰位于６００ｎｍ处，摩尔吸光系数为５０１×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，配合物组成比为１∶１，铬的质量浓度在０～０６０ｍｇ／Ｌ内符合比耳定律。结合离子交换分离，应用该法测定了煤飞灰、茶叶和水样中铬的含量。
A new sensitive chromogenic system for the determination of chromium(Ⅲ) has been studied. In KHC 8H 4O 4 HCl buffer soluction(pH 2.8), chromium(Ⅲ) reacts with arsenazo Ⅲ to form a 1∶1 blue complex. Maximum absorbance of the complex is at 600 nm with apparent molar absorptivity of 5.01×10 4 L·mol -1 ·cm -1 . Beers law is obeyed in the range of 0～0.60 mg/L for chromium(Ⅲ). Combined with ion exchange separation, the method has been applied to the determination of trace chromium in coal fly ash, tea and natural water samples with satisfactory results.
出处
《岩矿测试》
CAS
CSCD
北大核心
1996年第3期210-212,共3页
Rock and Mineral Analysis
基金
四川省教委青年科学基金
关键词
铬
偶氮胂Ⅲ
分光光度法
chromium, arsenazo Ⅲ, spectrophotometry
