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废五金料中金的测定方法,在国内至今尚未见报导,由于废五金料的组份复杂且又不稳定,某些含量高的有色金属离子会被活性碳少量吸附,如:铜、铁、锡、铅、锌等,特别是该物料中还含有少量的铂、钯,并与金一起被定量吸附,以致严重影响对金的测定。本方法采用在乙酸——乙酸钠缓冲溶液介质中,加入EDTA,以络合掩蔽有色金属离子,以酒石酸——柠檬酸在20％的硝酸介质
The method of determination of gold in scrap metal materials has not been reported in China so far. Due to the complexity and instability of the components of scrap metal materials, some non-ferrous metal ions with high content will be adsorbed by a small amount of activated carbon such as copper, iron, Tin, lead, zinc, etc. In particular, the material also contains a small amount of platinum and palladium and is quantitatively adsorbed together with gold, which seriously affects the determination of gold. The method adopts acetic acid - sodium acetate buffer solution medium, adding EDTA, in order to complex and conceal nonferrous metal ions, with tartaric acid - citric acid in 20% nitric acid medium