硝基苯并噻唑重氮氨基偶氮苯与汞的显色反应研究

A Study on the Colour Reaction of the Nitrobenzothiazolyldiazoaminoazobenzene with Mercury

报道了新试剂硝基苯并噻唑重氮氨基偶氮苯 ( NBTDAA)与汞的显色反应。结果表明 ,在非离子表面活性剂 Triton X-1 0 0存在下 ,p H为 9.5～ 1 0 .0的 Na2 B4O7-Na OH缓冲体系中 ,汞与该试剂能形成 1∶ 4的络合物 ,其最大吸收波长为 51 5nm ,表观摩尔吸光系数为 1 .3 5× 1 0 5 L· mol- 1 · cm- 1 ,线性范围 0～ 1 2μg/ 2 5m L。用拟定的方法测定了废水中的汞 ,结果满意。

The colour reaction of a new reagent nitrobenzothiazolyldiazoaminoazoben zene(NBTDAA) with Hg(Ⅱ) is reported. At pH=9.5~10.0, NBTDAAreacts with Hg(Ⅱ) to form a stable red complex (1∶4)in the presence of Triton X 100. The maximum absorption of the complex is at 515 nm and the apparent molar absorption is 1.35×10 5 L·mol -1 cm -1 .Beer’s law is obeyed in the range of 0~12 μg/25 mL. The method has been applied to the determination of Mercury in waste water with satisfactory results.