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在一定的底液中,铅和镉都能与碘离子形成[PbI_4]~2、[CdI_4]~(2-)络离子,吸附在滴汞电极上并产生一个高灵敏的极谱催化波,已有报导。本文在此基础上,对铅和镉的吸附催化波作了进一步研究。经试验确定,以0.1N盐酸-0.4%抗坏血酸-0.04%硫氰酸钾-0.8%碘化钾为底液,连续测定矿石中微量铅和镉。铅峰电位为-0.58伏(对饱和甘汞电极),镉峰电位-0.72伏(对饱和甘汞电极)。在25毫升体积中,铅和镉在0.5～20微克范围内呈线性关系,测定下限均达0.02微克/毫升。试验表明:在此底液中,5毫克锌、锰,2毫克钙,500微克铜、铝、铋,400微克镍,200微克钨、钛,150微克锡,100微克钼、磷、镓、钴、锑、
Lead and cadmium can form [PbI_4] ~ 2, [CdI_4] ~ (2-) complex ions with iodide ions in a certain amount of bottom liquid, adsorbed on the drop mercury electrode and produced a highly sensitive polarographic catalytic wave, It has been reported. Based on this, further studies on the catalytic wave of adsorption of lead and cadmium have been carried out. The test determined that 0.1N hydrochloric acid -0.4% ascorbic acid -0.04% potassium thiocyanate -0.8% potassium iodide as the continuous determination of trace lead and cadmium in ore. Lead peak potential -0.58 volts (for saturated calomel electrode), cadmium peak potential -0.72 volts (for saturated calomel electrode). In a 25 ml volume, there is a linear relationship between lead and cadmium in the range of 0.5-20 μg, with a lower limit of detection of 0.02 μg / ml. Tests showed that in this base solution, 5 mg zinc, manganese, 2 mg calcium, 500 μg copper, aluminum, bismuth, 400 μg nickel, 200 μg tungsten, titanium, 150 μg tin, 100 μg molybdenum, phosphorus, gallium, ,antimony,