1-(2-苯并咪唑)-3-[4-(苯基偶氮)苯基]-三氮烯的合成及其与镍(Ⅱ)的显色反应

Synthesis of 1-(2-benzimidazolyl)-3-(4-phenylazophenyle)-triazene and its color reaction with nickle(Ⅱ)

合成了试剂1-（2-苯并咪唑）3-E4-（苯基偶氮）苯基]-三氮烯（PIPAPT）并研究了其与镍（Ⅱ）的显色反应。在非离子表面活性剂Triton X-100存在下，于pH9．60的H3BO3-KCl-NaOH缓冲介质中，试剂与镍（Ⅱ）形成4：1的橙红色络合物，在539nm处有-最大吸收峰，镍的质量浓度在0～0．50μg／mL范围内符合比尔定律，表观摩尔吸光系数为7．74×10^4 L·mol^-1·cm^-1。方法用于铝合金标准样品中镍的测定，结果同认定值相-致，相对标准偏差为3．2％和2．9％。

A new reagent 1-（2-benzimidazolyl）-3-（4-phenylazophenyle）-triazene （PIPAPT） was synthesized and its color reaction with nickel（H） was studied. In the presence of non-ionic surfactant Triton X-100,the reagent reacted with nickel（H） to form a 4 ： 1 orange-red complex in the medium of H3BO3-KCl-NaOH at pH 9.60. The maximum absorption wavelength was 539 nm. Beer＇s law was obeyed in the range of 0-- 0.50 μg/mL for nickel . The apparent molar absorptivity was 7.74 × 10^4 L.mol^-1.cm ^-1. The method has been applied to determine nickel（H） in aluminum alloy certified reference materials, and the results were consistent with the certified values with the RSD of 3.2 % and 2.9%.