表面活性剂增敏偶氮氯膦mA褪色光度法测定铬的研究  

The Spectrophotometric Determination of Trace Chromium(VI) with CPA-mA

作　　者：于京华[1] 季连荣 孙元梅 欧庆瑜[1] 

机构地区：[1]中国科学院兰州化学物理研究所,甘肃兰州730000 [2]山东建设发展研究院,山东济南250010 [3]济南山水集团,山东济南250022

出　　处：《济南大学学报（自然科学版）》2003年第3期238-240,共3页Journal of University of Jinan(Science and Technology)

摘　　要：研究了偶氮氯膦mA与铬 (VI)褪色反应的影响因素。发现在硝酸介质中 ,表面活性剂对偶氮氯膦mA与铬(VI)的褪色反应有明显的增敏作用 ;铬 (VI)量在 0～ 2 4 0 μg/L之间符合比尔定律 ,其摩尔吸光系数达到 8.2× 10 4L·mol-1·cm-1;建立了光度法测定铬的新方法。The fading reaction of CPA-mA with Cr 2O 2- 7 was studied.In the medium of surface active agent and nitric acid,the fading reaction has high sensibility.The Beer's law is obeyed in the range of 0～240?μg/L Cr(VI) content, and the molar absorptivity of reaction is 8.2×10 4?L·mol -1 ·cm -1 .So a new method determining trace chromium is developed.This method can be used to the determination of chromium in water and alloy steel samples.

关 键 词：分光光度法 褪色反应 铬(Ⅵ) 偶氮氯膦MA 

分 类 号：O657.3[理学—分析化学]