摘要
本文研究了铬（Ⅵ）－苯基荧光酮（ＰＦ）－＋六烷基二甲基氨基乙酸（ＣＤＭＡＡ）体系的分光光度特性和最适宜的显色条件。在两性表面活性剂ＣＤＭＡＡ存在下，于ｐＨ５．５～７．４的缓冲介质中铬（Ⅵ）与ｐＦ形成１：３的紫红色配合物，显色体系在５７６ｎｍ处有最大吸收，其摩尔吸光系数为１．４６×１０￣５Ｌ·ｍｏｌ￣（－１）＊ｃｍ￣（－１），铬（Ⅵ）含量在０～８．０μｇ／２５ｍＬ范围内符合比尔定律，变异系数为１．０３％～４．３３％。方法简便，灵敏度高，精密度和准确度好，在混合掩蔽剂存在下，可直接测定水中铬（Ⅵ）。
In this paper,the spectrophotometric char-acteristics and the optimum conditions of for-mation of the Cr(Ⅵ)-PF-CDMAA systemhave been studied,Chromium ( Ⅵ) reacts withphenyl fluorone in the presence of amphotericsurfactant cetyl dimethyl aminoacetic acid in abuffer solution of pH 5.5～7. 4 to form a violetred complex with the composition ratio 1 : 3.Maximum absorbance of the complex is at576nm,with molar absorptivity of 1. 46 ×10￣5 L·mol￣(-1)·cm￣(-1). Beer’s law is obeyed inthe range of 0～8.0μg/25mL for chromium.The method is simple and sensitive,it showssatisfactory precision and accuracy, It has beenapplied to determine chromium in waters in theprecence of masking agents.
出处
《分析试验室》
CAS
CSCD
北大核心
1995年第1期29-31,共3页
Chinese Journal of Analysis Laboratory
关键词
铬
分光光度法
表面活性剂
PF
CDMAA
Chromium determinaton
phenylfluorone
spectrophotometry
surfactant
