新显色剂甲氧基-苯并噻唑重氮氨基偶氮苯与汞的显色反应及应用研究

Study on the Colour Reaction of a New Reagent Methoxybenz thiazoldiazoaminoazobenzene with Mercury and its Application

研究了新显色剂６－甲氧基－苯并噻唑重氮氨基偶氮苯与Ｈｇ（Ⅱ）的显色反应。在非离子表面活性剂存在下的ｐＨ１０．５Ｎａ２Ｂ４Ｏ７～ＮａＯＨ缓冲介质中，Ｈｇ（Ⅱ）与该试剂形成１∶２的稳定络合物，其λｍａｘ＝５２５ｎｍ，ε５２５＝１．６８×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。汞含量在０～８μｇ／１０ｍＬ范围内遵守比尔定律。用于废水中汞的测定。

The colour reaction of Hg(Ⅱ) with a new reagent methoxybenz thiazoldiazoaminoazobenzene (MeOBTDAA) was studied. Results show that this reagent reacts with Hg(Ⅱ) forming a stable red complex 2∶1 in the presence of Triton X 100 and at pH 10.5. The absorption maximum and apparent molar absorptivity are 525 nm and 1.68× 10 5 L·mol -1 ·cm -1 respectively. Beer's law is obeyed in the range of 0～8 μg/10 mL. This method is highly sensitive and selective. It has been applied to the direct determination of mercury in waste water samples with satisfactory results.