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纯金属中痕量元素的分析是当前分析化学研究的一个重要课题,要求分析方法具有较高的灵敏度和良好的选择性。极谱法测定铜的方法已有报导,但铜—2-巯基苯并噻唑体系尚未见报导。我们在实验中发现,在氨性底液中,铜—2-巯基苯并噻唑配合物在单扫极谱上有—灵敏的还原波。实验确定底液的适宜组成为:8×10~(-5)mol/L2-巯基苯并噻唑,0.80mol/I NH_3·H_2O,0.040mol/L NH_4Cl。在此条件下,该配合物波高与铜浓度在1×10~(-9)～2×10~(-7)g/ml范围内呈良好的线性关系。对30多种常见离子的
The analysis of trace elements in pure metals is an important issue in the current analytical chemistry research, which requires that the analytical method has high sensitivity and good selectivity. Polarographic determination of copper has been reported, but the copper-2-mercaptobenzothiazole system has not been reported. We found in the experiment that copper-2-mercaptobenzothiazole complex has a sensitive reduction wave in single-sweep polarography in ammoniacal bottom solution. The optimum composition of the bottom liquid was determined as follows: 8 × 10 ~ (-5) mol / L-mercaptobenzothiazole, 0.80 mol / I NH_3 · H_2O and 0.040 mol / L NH_4Cl. Under these conditions, the wave height of the complex showed a good linear relationship with the concentration of copper in the range of 1 × 10 -9 ~ 2 × 10 -7 g / ml. For more than 30 kinds of common ions