本文研究了新显色剂2—氯—4—溴苯基重氮氨基偶氮苯与汞的显色反应。在非离子表面活性剂Triton X—100存在下,于pH10.4的硼砂—氢氧化钠介质中,该试剂与汞(Ⅱ)形成2:1稳定的红色配合物,其配合物的最大吸收波长位于500nm处,表观摩尔吸光系数为8.3×10~4Lmol~(-1),cm~(-1),汞(Ⅱ)量在0—15μg/25ml范围内符合比尔定律。该法用于废水中微量汞的测定,结果满意。 The color reaction of 2-chloro-4-bromophenyldiazoaminoazobenzene with mercury was studied in this paper. The reagent formed a 2: 1 stable red complex with mercury (Ⅱ) in the presence of nonionic surfactant Triton X-100 in pH 10.4 Borax-sodium hydroxide solution. The maximum absorption wavelength of the complex At 500 nm, Beer ’s law was obeyed for the apparent molar absorptivity of 8.3 × 10 ~ 4 L mol -1, cm -1, and the amount of mercury in the range of 0-15 μg / 25 ml. The method is applied to the determination of trace mercury in wastewater with satisfactory results.