矩形波ポーラログラフ法による硫酸中の鉄の定量

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In the experiments in which the square-wave polarogram of iron-complex was taken in 0.36M sulphuric acid saturated with oxalic, citric or tartric acid, respectively, the wave of iron-complex appeared only in the electrolyte saturated with oxalic acid. The iron-wave became higher as the concentration of sulphuric acid was decreased in the electrolyte of 1M oxalic acid and it was overlapped with the mercury-wave when the concentration of sulphuric acid was over 1M. The iron-wave became higher as the concentration of oxalic acid increased in 0.36M sulphuric acld, but the variation of the wave-height was not so large when the sulphuric acid concentration was changed. The temperature coefficient of wave-height of iron-complex in 0.36M sulphuric acid and 1Moxalic acid electrolyte was about 1% a degree. Although copper is often contained in oxalic acid as an impurity, the copper-wave appeared on the potential of -0.4V more negative than the iron-wave in the said electrolyte.
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