标准加入双波长光度法同时测定化学镀层中的镍钴

Simultaneous Determination of Nickel and Cobalt in Chemical Plating Layers by Standard Additions-dual Wavelength Spectrophotometry

研究了标准加入双波长光度法同时测定化学镀层中镍钴的试验条件,并对镍钴合成样和实际镀层样品进行了测定。在pH3.8的乙酸-乙酸钠缓冲溶液中,采用显色剂5-Br-PADAP测定镍钴的测定波长和参比波长分别为564nm和592nm,镍在两个波长下符合比耳定律的范围分别为0～50μg/25mL和0～40μg/25mL,钴为0～50μg/25mL。用该法对镍钴合成样和实际化学镀钴-镍-磷及镍-钴-磷合金镀层中镍、钴的同时测定,回收率在95%～105%之间,结果令人满意。

The simultaneous determination of cobalt and nickel in chemical plating layers via standard additions-dual wavelength spectrophotometry was studied, and the synthetic mixtures of cobalt and nickel and the actual plating samples were determined in this paper. In acetic acid-sodium acetate buffer solution at pH 3.8, determination wavelength and reference wavelength of simultaneous determination of cobalt and nickel by color reagent 5-Br-PADAP are equal to 564 nm and 592nm respectively. At the two wavelengths, Beer's law is obeyed in the concentration range of 0～50μg/25mL or 0～40μg/25mL for nickel respectively, but for cobalt both are 0～50μg/25ml. The method has been applied to the simultaneous determination of synthetic mixtures of cobalt and nickel and plating layers of the actual chemical Co-Ni-P and Ni-Co-P alloy plating with a satisfactory result and a recovery rate ranging from 95% to 105%.