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在乳化剂ＯＰ存在下，于ｐＨ９．７～１０．０的Ｎａ＿２Ｂ＿４Ｏ＿７－ＮａＯＨ缓冲介质中，Ｎｉ￣（２＋）与邻羧基苯基重氮氨基偶氮苯（ＣＤＡＡ）形成组成比为１：２的稳定的红色配合物，其吸收峰波长在５４０ｎｍ，对比度△λ＝１２６ｎｍ，表观摩尔吸光系数为１．９９×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），室温下２０ｍｉｎ内显色反应完全，有色配合物至少稳定１２ｈ。方法线性范围是０～０．２０μｇ／ｍｌＮｉ，检测限为０．０００４μｇ／ｍｌ。在掩蔽剂存在下，方法用于矿样和低合金钢的分析，结果与标准值相符，其ＲＳＤ（ｎ＝６）分别为１．８％和３．１％，标准加入回收率为９５．０％～１０１．２％。
In the presence of emulsifier OP, Na ~ (2+) and o-carboxyphenyldiazoaminoazobenzene (CDAA) were formed in a ratio of 1: 2 in Na_2B_4O_7-NaOH buffer solution The stable red complex has an absorption peak wavelength at 540 nm, a contrast ratio △ λ = 126 nm, an apparent molar absorption coefficient of 1.99 × 10 -5 L · mol -1 (-1) cm · s -1 at room temperature for 20 min Color reaction within the complete, colored complexes at least stable 12h. The linear range of the method is 0 ~ 0.20μg / mlNi, the detection limit is 0.0004μg / ml. In the presence of masking agent, the method was applied to the analysis of mineral samples and low alloy steels. The results were consistent with the standard values. The RSD (n = 6) was 1.8% and 3.1% respectively, and the standard recovery was 95%. 0% ~ 101.2%.