苯并噻唑重氮氨基偶氮苯与汞(Ⅱ)的显色反应及其应用

Colour Reaction of Chromogenic Reagent Benzothiazolyldiazoaminoazobenzene With Mercury(Ⅱ) and Its Application

报道了新试剂苯并噻唑重氮氨基偶氮苯的合成及其与汞（Ⅱ）的显色反应。在Ｔｒｉｔｏｎ Ｘ－１００存在下的弱碱性介质中，试剂与汞形成２：１的橙红色络合物，最大吸收波长位于５２０ ｎｍ处，表观摩尔吸光系数为１．５１×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。汞量在 ０～１．２ｍｇ／Ｌ范围内遵守 比尔定律。直接应用于废水中微量汞的测定，结果满意。

The synthesis of a new reagent benzothiazolyldiazoaminoazobenzene and its chro- mogenic reaction with mercury (Ⅱ) ion was reported. In a weak alkaline medium, the reagent reacts with mercury(Ⅱ) to form an orange-red complex of component ratio 2: 1. The absorption maximum of the complex is at 520 nm and the apparent molar absorptivity is 1. 51×105L·mol-1·cm-1. Beer's law is obeyed for mercury (Ⅱ) in the range 0-1. 2 mg/L. This method is employed to determine trace amounts of mercury(Ⅱ) in waste water with satisfactory results.