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首次将银盘电极用于示波计时电位法直接进行示波测定 ,讨论了银盘电极上的示波计时电位法。银盘电极制备简单 ,寿命长 ,使用时不需镀汞 ,无污染。与用汞膜电极的示波计时电位法相比 ,银盘电极上的示波计时电位法具有图形稳定、灵敏度高、精密度好及测定的线性范围宽等优点。通过对 Pb2 + ,Zn2 + ,In3 + 3种离子的定量测定表明 ,检测下限在 1 0 -9～ 1 0 -7mol/L之间。对自来水样中痕量 Pb2 + 进行分析 ,结果令人满意
For the first time, the silver plate electrode was used for direct oscillometric determination by oscillometric chronopotentiometry, and the oscillometric chronopotentiometry method was discussed. Silver plate electrode preparation is simple, long life, when used without mercury plating, no pollution. Compared with the oscillometric chronopotentiometry method using the mercury film electrode, the oscillometric chronopotentiometry on the silver plate electrode has the advantages of stable pattern, high sensitivity, good precision and wide linear range of measurement. The quantitative determination of three ions of Pb2 +, Zn2 + and In3 + showed that the lower limit of detection was between 10 -9 ~ 10 -7 mol / L. Analysis of trace Pb2 + in tap water samples showed satisfactory results