矩形波ポーラログラフ法による硫酸中の鉛の定量

概要

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The peak potential of lead in sulphuric acid by the square-wave polarography is shifted to negative potential as the concentration of sulphuric acid increases. As the result, in 15M H2SO4, the wave of lead is not well-defined. In 10MH2SO4, however, in which the solubility of lead seemed to be about 5 × 10-6M, the capacity current at the peak potential of lead - -0.88 V vs. Hg-pool - was so small that the wave of lead was well-defined even in its small concentration. The wave-height of lead was dependent upon the temperature, and above 20°C, it increased slowly in the course of time. By the use of the calibration curve obtained under a definite condition in which the concentration of sulphuric acid was 10M, and the time of deaeration after inserting the cell into the constant temperature bath of 40°C was 20 min, 0.026 ppm of lead in reagent grade sulphuric acid and 0.52 ppm of lead in technical sulphuric acid could be determined.
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