在pH=8.0、HCl-tris缓冲溶液和Tween80胶束介质中,研究了1-亚硝基-2-萘酚(NN)与Ni(Ⅱ)的显色反应.建立了胶束光度法测定微量Ni(Ⅱ)的新方法.结果表明,Ni(Ⅱ)-NN配合物的最大吸收波长为455 nm,摩尔吸光系数为1.01×104 L/(mol*cm),检出限为0.04 mg/L,有色溶液的吸光度与Ni(Ⅱ)量在0.2～1.0 mg/L范围内符合比耳定律,加标回收率为96.2%～103.1%(n=6).测定了非晶态FeNiCr合金钢中的镍.
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