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％。 The new synthesized chromogenic reagent 2-arsonyl-4-methylphenyldiazoaminoazobenzene was used for the spectrophotometric analysis of Ni. In the presence of nonionic surfactant OP, the reagent and Ni (Ⅱ) formed a stable red complex with 2: 1 ratio in the buffer solution of Na_2B_4O_7-NaOH at pH 11.2, with the maximum absorption wavelength at 538 nm, showing molar absorptivity Coefficient ε_538 = 1.92 × 10 ~ 5L · mol ~ -1 · cm ~ -1, Ni content in the range of 0 ~ 0.32μg / ml Beer’s law. The method was applied to the determination of trace Ni in aluminum alloy and nickel sulfide ores. The result was consistent with the recommended value, and RSD (n = 5) was less than 5%.