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在ｐＨ８～９的ＮＨ_３·Ｈ_２Ｏ－ＮＨ_４Ｃｌ缓冲溶液中，有氯化十六烷基吡啶（ＣＰＣ）存在下，新显色剂１，４－双肼酞嗪（ＤＨＰＨ）与镍形成稳定的１：１蓝绿色水溶性络合物．其最大吸收波长λ_ｍａｘ＝６９０ｎｍ，表观摩尔吸光系数ε=２．１５Ｘ１０ ~４镍量在０～ ５６μｇ／２５ｍＬ范围内服从比尔定律，本方法操作简便快速，结果稳定，选择性好，已用于铝合金中痕量镍的测定，结果满意．
In pH8 ~ 9 NH_3 · H_2O-NH_4Cl buffer solution, in the presence of cetyl pyridinium chloride (CPC), the new color reagent 1,4-bishydralazine (DHPH) and nickel form a stable 1: 1 blue-green water-soluble complex. The maximum absorption wavelength λ_max = 690nm, the apparent molar absorptivity ε = 2.15X10 ~ 4 Nickel content in the range of 0 ~ 56μg / 25mL obeys Beer’s law, the method is simple, fast, stable, good selectivity, has been used in Determination of trace nickel in aluminum alloy with satisfactory results.