Hg(Ⅱ)-KI-XO-Gum-PVA 显色体系的研究和应用

Studies and Applications of Developing System in Hg(Ⅱ)-KI-XO-Gum-PVA

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０～１２μｇＨｇ２＋／２５ｍＬ范围内服从Ｂｅｅｒ定律，表观摩尔吸光系数高达２６９×１０６Ｌ·ｍｏｌ－１，ｃｍ－１，平均回收率达９７４％～１０２５％用这一显色体系测定乳制品中微量汞。

The formation of a multicomponent complex among mercury,portassium iodide and xylenol orange is well distributed in aqueous solution as a steady system under the existence of Arabirgum-polyvinyl alcohol.The maximum absorption wave length of the complex is at 530 nm.Beer's law is obeyed over the range of 0～12 μg/25 mL for mercury.The molar absorptivity is 2.69×10 6 L·mol -1 ·cm -1 .This method has been applied to the determination of Hg(Ⅱ) in milk with satisfactory results.