摘要
在非离子表面活性剂阿拉伯树胶和聚乙烯醇存在下，汞与碘化钾和二甲酚橙在水相中形成稳定的多元配合物显色体系。该配合物在５３０ｎｍ处有一最大吸收波长，汞含量在０～１２μｇ／２５ｍＬ范围内服从比耳定律，表观摩尔吸光系数高达２．４３×１０６Ｌ·ｍｏｌ－１·ｃｍ－１，平均回收率９７．４％～１０２．５％。用该法测定乳制品中痕量汞，结果令人满意。
The multicomponent complex formed between mercury, potassium iodide and xylenol orange in the presence of arabic gum polyvinyl alcohol is well distributed in aqueous solution as a steady system. The maximum absorption of the multicomponent complex is at 530nm. Beer′s law is obeyed over the range of 0￣12μg/25mL for mercury. The molar absorptivity is 2.43 ×10 6 L·mol -1 ·cm -1 . This method has been applied to the determination of Hg(Ⅱ) in milk with satisfactory results.
出处
《化学试剂》
CAS
CSCD
1998年第6期344-346,365,共4页
Chemical Reagents
关键词
汞
碘化钾
吸光光度法
二甲酚橙
乳制品
测定
mercury, potassium iodide, xylenol orange, arabic gum, polyvinyl alcohol
