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在氢氧化铵——氯化铵介质中极谱法测定矿石中微量铜是较为成熟的方法.但其测定灵敏度仍感不足,而且大量氢氧化物,二氧化锰等沉淀物对铜的吸附及某些元素的干扰也影响微量铜测定的准确性.我们观察到铜在硫酸——硫氰酸钾介质中在示波极谱仪上于E_p≈-0.45伏(对S.C.E.)处产生一尖锐清晰的极大峰.本文试验了影响峰电流的各种因素,观察了共存离子干扰情况,选择了用硫代硫酸钠富集微量铜的适宜条件,拟定了锰矿石中测定微量铜(0.005～0.5%)的分析方法.
Polarographic determination of trace copper in ores with ammonium hydroxide-ammonium chloride is a more mature method, but its sensitivity is still insufficient, and a large number of copper hydroxide adsorption and sedimentation of hydroxide and manganese dioxide The interference of some elements also affected the accuracy of the trace copper determination.We observed that copper produced a sharp sharpness on an oscillographic polarograph at E_p≈-0.45 volts (vs. SCE) in sulfuric acid-potassium thiocyanate medium Of the maximum peak.In this paper, various factors affecting the peak current were tested, the interference of coexisting ions was observed, the suitable conditions for enriching trace copper with sodium thiosulfate were selected, and the determination of trace copper (0.005-0.5% ) Analysis method.