为了简便、快速而准确地测定Zn—Ni合金镀液中的Ni2＋含量，不使用任何化学显示剂，利用分光光度法研究了Ni2＋，Ni2＋／Na2＋，Ni2＋／Zn2＋体系中Ni2＋的吸光特性。结果表明：在Ni2＋体系中，Ni盐浓度为5～100g／L，入射光波长为660nm时，Ni2＋浓度与吸光度呈线性关系；在Ni2＋／Na2＋，Ni2＋／Zn2＋体系中，Na2＋和Zn2＋对该波长入射光无吸收，由此提出了Zn－Ni合金镀液中Ni2＋含量的快速测定方法；对Ni2＋，Na2＋，Zn2＋共存的标准溶液中Ni。’含量测定结果显示，本方法操作简单、速度快、准确度高。
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