新试剂6-溴-2-苯并噻唑重氮氨基偶氮苯的合成及其与汞(Ⅱ)的显色反应

Synthesis of 6-bromo-2-benzothiazolyl diazoaminoazobenzene and its colour reaction with mercury

报道了6 溴 2 苯并噻唑重氮氨基偶氮苯(BBTDAA)的合成及其与汞(Ⅱ)的显色反应。在TritonX 100存在下,于pH10.8的Na2B4O7 NaOH缓冲体系中,Hg(Ⅱ)与BBTDAA形成1∶4的红色配合物,试剂与配合物的最大吸收波长分别为430nm和515nm,表观摩尔吸光系数为1.88×105L/mol·cm。汞在0～0 32μg/mL范围内符合比尔定律。用拟定的方法测定了湖水和废水中的汞。

A new reagent 6bromo2benzothiazolyldiazoaminoazobenzene(BBTDAA) was synthesized. The colour reaction of BBTDAA with Hg (Ⅱ) was investigated. At pH 10.3～11.4, BBTDAA reacted with Hg (Ⅱ) to form a stable red complex in the presence of triton X100. The molar composition of the complex was Hg(Ⅱ)∶BBTDAA=1∶4. The apparent molar absorptivity was 1.88×105 L/mol·cm. Beer′s law was obeyed in the range of 0～032 μg/mL of mercury. The method was applied to the determination of mercury in environmental water samples with satisfactory results.