【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）。更多还原

【Abstract】 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.更多还原