【摘要】 拟定了一种高灵敏度、高选择性的分光光度法测定锌合金中微量镍。在pH10硼酸缓冲溶液中,表面活性剂(TritonX 100)存在下,镍与邻羧基苯基重氮氨基偶氮苯(简称o CDAA)形成砖红色络合物,其最大吸收波长为542nm,表观摩尔吸光系数ε可达到1 24×105。在25mL溶液中,镍量在0～6μg间呈线性关系,测定5μg镍时RSD为1 0%。该法灵敏、简单、稳定、快速,已用于热镀锌合金或锌中间合金中微量镍的测定,结果满意。更多还原

【Abstract】 A high sensitive and selective spectrophotometric method for the determination of trace nickel in zinc alloy has been developed.In the boric acid buffer solution（pH=10）, nickel with a new chromogenic reagent o-carboxyl-phenyl diazoamino azobenzene forms a brick red stable complex which shows maximum absorption wavelength at 542 nm with a molar absorptivity of 1.24×10⁵ L·mol^-1·cm^-1.Beer’s law is obeyed in the range of 0-6 μg/25 mL for nickel. RSD is 1.0% for the determination of 5 μg/25 mL nickel. This method is very sensitive,simple,and it has been used for the determination of nickel in hot-dipping zinc alloy with satisfactory results.更多还原