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前人研究硒、碲的极谱分析时,曾在pH1.6的柠檬酸缓冲溶液和-0.45、-0.65伏(对饱和甘汞电极)下分别进行亚硒酸和亚碲酸的恆电位库仑分析来测定电子转移数n.我们在这一基础上,研究了硒在大面积汞阴极的恆电位库仑分析的条件。将未知量的亚硒酸在一定的控制电位下电解还原到电流不再下降为止,硒的量可从输入电量Q(库仑)算出。被测的硒量在毫克以下时,量得的电量需要加以改正,卽减去
In previous studies of polarographic analysis of selenium and tellurium, potentiostatic coulometry of selenite and tellurite were carried out respectively in citrate buffer solution of pH 1.6 and -0.45, -0.65 volts (for saturated calomel electrode) Analysis to determine the number of electron transfer n. On this basis, we studied the coulometric analysis of selenium in a large area mercury cathode potential. The amount of selenium is calculated from the input power Q (coulombs) by reducing the unknown amount of selenous acid to a potential of no reduction in current at a controlled potential. Measured selenium in the following mg, the amount of electricity needs to be corrected, 卽 minus