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利用在乙酸缓冲溶液中铁、钴、镍与 1 -亚硝基 - 2 -萘酚 - 3,6-二磺酸钠 (NRS)生成有色配合物的反应 ,结合在两次标准加入法原理的基础上 ,提出了三组分同时测定的三次标准加入法 ,并应用于铁、钴、镍的同时测定。为消除组分间协同效应所引起的吸光度加合性的偏离 ,定义了三组分协同效应系数 ,并将其引入三组分同时测定方法 ,补偿吸光度对线性的偏离 ;补偿后铁、钴、镍的测定线性范围分别为 0 .0 3～ 3.50 ,0 .0 5～ 3.50 ,0 .0 2 5～ 4.50 mg·L-1。测定了锌铝合金及模拟样品中铁、钴、镍的含量并取得满意结果
Using the reaction of iron, cobalt and nickel with 1 - nitroso - 2 - naphthol - 3, 6 - disulfonate (NRS) in acetic acid buffer to form colored complex, combined with the principle of two standard addition methods On the proposed three-component simultaneous determination of three standard addition method, and applied to the determination of iron, cobalt and nickel simultaneously. In order to eliminate the deviation of absorbance adduct caused by the synergistic effect between components, the synergistic coefficient of three components was defined and introduced into the three-component simultaneous determination method to compensate the deviation of absorbance from linearity. After compensation, The linear range of determination of nickel was 0. 03 ~ 3.50, 0. 05 ~ 3.50, 0. 025 ~ 4.50 mg · L -1. The contents of iron, cobalt and nickel in zinc-aluminum alloy and simulated samples were determined and satisfactory results were obtained