报道了大量锌存在时微量钴的极谱测定。试验表明,在丁二酮肟-柠檬酸钠-氯化铵体系中(pH 6.0～7.0),钴有灵敏的导数波,五万倍的锌存在不干扰钴的测定,方法简便、快速、灵敏度高,检出限为5×10~(-9)mol·L~(-1),钴离子浓度在0.01～1.0μg·ml~(-1)范围内与峰电流呈良好的线性关系。测定了锌电解液中的微量钴,结果令人满意。 Polarographic determination of trace cobalt in the presence of a large amount of zinc has been reported. The results show that cobalt has a sensitive derivative wave in the dimethylglyoxime-sodium citrate-ammonium chloride system (pH 6.0-7.0) and the presence of 50,000 times of zinc does not interfere with the determination of cobalt. The method is simple, rapid and sensitive The detection limit was 5 × 10 -9 mol·L -1, and the cobalt ion concentration was in the range of 0.01-1.0 μg · ml -1 with a good linear relationship with the peak current. The determination of a trace amount of cobalt in zinc electrolyte, the results are satisfactory.