【摘要】 作者将新合成的显色剂２－胂酸基－４－甲基苯基重氮氨基偶氮苯用于Ｎｉ的分光光度分析。在ｐＨ１１．２的Ｎａ＿２Ｂ＿４Ｏ＿７－ＮａＯＨ缓冲介质中，非离子型表面活性剂ＯＰ存在下，试剂与Ｎｉ（Ⅱ）生成组成为２：１的稳定红色配合物，其最大吸收波长位于５３８ｎｍ，表现摩尔吸光系数ε＿５３８＝１．９２×１０￣５Ｌ·ｍｏｌ￣－１·ｃｍ￣－１，Ｎｉ量在０～０．３２μｇ／ｍｌ范围符合比尔定律。用该法测定了铝合金及硫化镍矿石中的微量Ｎｉ，结果与推荐值相符，ＲＳＤ（ｎ＝５）小于５％。更多还原

【Abstract】 sensitive color reaction of Ni(Ⅱ)with a new reagent 2-arsono-4-methylphenyl-diazoaminoazobenzene has been studied.Astable red complex is formed in a medium of pH 10.8～11.5 and in the presence of OP. The ratio of Ni(Ⅱ)to the reagent in the complex is found tobe 1 :2.The apparent molar absorptivity measured is 1.92×10￣5L·mol￣-1· Cm￣-l at 538 nm.Beer’s law is obeyed in the range of 0～0.32μg/ml.The method has been applied to thedetermination of Ni in aluminium allovs and Ores with satisfactory results.更多还原