【摘要】 合成了新显色剂4-(4-氯苯重氮基)氨基-4′-氯偶氮苯(简称CDACAB),并研究了其与汞(Ⅱ)的显色反应。结果表明,在非离子表面活性剂OP存在下,在pH=10.5的Na2B4O7-NaOH缓冲介质中,汞(Ⅱ)与CDACAB形成1∶2橙红色络合物,其最大吸收波长位于498nm处,表观摩尔吸光系数ε=1.15×105 L.mol-1.cm-1。汞(Ⅱ)质量浓度在0～7.0μg/10mL范围内遵守比耳定律。所拟方法用于废水中微量汞(Ⅱ)的测定,相对标准偏差为1.6%～3.1%,回收率为96.5%～103.8%。更多还原

【Abstract】 A new reagent 4-(4-chlorobenzenediazo)amino-4′-chlorineazobenzene(CDACAB) was synthesized,and its colour reaction with mercury(Ⅱ) was studied.In the presence of OP,the reagent can react with mercury(Ⅱ) to form a stable orange-red complex in a medium of Na2B4O7-NaOH buffer of pH 10.5.The apparent molar absorptivity is 1.15×105 L·mol-1·cm-1at the maximum absorption of 498 nm.Beer’s law was obeyed over the range of 0-7.0 μg mercury(Ⅱ) in 10 mL solution.The method has been directly applied for the determination of Hg(Ⅱ) in waste water with relative standard deviation of 1.6%-3.1% and recovery of 96.5%-103.8%.更多还原