碱性锌锰电池中微量汞的测定

采用分光光度法对电池中微量汞进行测定。在聚乙烯醇存在下，汞与硫氰酸盐和丁基罗丹明Ｂ形成多元离子缔合物，在 ５８０ｎｍ处有最大吸收波长，０～６μｇ／２５ｍｌ范围内服从比尔定律，表观摩尔吸光系数为 ７．０８×１０５ Ｌ／ｍｏｌ·ｃｍ。本方法具有操作简便，快速，选择性和重现性好的特点。测定中除铁（Ⅲ），锌（Ⅱ）外，电池中存在的其它元素均不干扰测定。

Determination of Trace Mercury in Alkaline Zn/MnO2 Battery

A simple, rapid and reliable spectrophotometric method was used to determine mercury(Ⅱ)in alkaline Zn/MnO2 battery. In the presence of polyvinyl alcohol(PVA-124),the reaction of Hg(SCN)42- ,a complex formed from Hg(Ⅱ),with thiocyamate and rhodamine B yields a polybasic ion-associate with a wavelength of maximum adsorption at 580 nm, Beer' s law was obeyed in the Hg(Ⅱ) concentration range of 0～6μg/25ml. The apparent molar adsorptivity was 7.08×105L/mol·cm and the limit of detection,0. 0038mg. The analysis was not interfered by almost all ions in alkaline Zn/MnO2 batteries except Fe3+ and Zn2+ ,which could be masked by addition of masking agents,such as ascorbic acid and citric acid.