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银离子的还原电位在绝大多数支持电解质中,都在汞溶出的阳极波之前,因此银在滴汞电极上的极谱数据报导不多。常使用旋铂电极测银,但因操作麻烦、重现性差,而未能广泛使用。在金电极氨底液中,银于-0.13伏(炭棒为参比电极)有个清晰的导数波,可定量测定银。因银的峰电位较正,干扰很少,硝酸也不影响测定,故分析程序较简单,4小时可完成30个样品的测定。实验部分试剂:银标准溶液,每毫升含银5毫克,0.5毫克。底液:取140克氯化铵,13克亚硫酸钠溶于水,加333毫升氨水,用水稀释至1000毫升。
Silver ion reduction potential in the vast majority of supporting electrolytes are in front of the mercury dissolution of the anode wave, so the silver droplet mercury polarographic data reported little. Often use platinum electrode silver, but because of the trouble of operation, poor reproducibility, but not widely used. In the gold electrode ammonia liquid, silver at -0.13 volts (carbon rod as the reference electrode) has a clear derivative wave, quantitative determination of silver. The peak potential of silver is more positive, less interference, nitric acid does not affect the determination, so the analysis program is relatively simple, 4 hours to complete the determination of 30 samples. Experimental Reagents: Silver standard solution, silver per milliliter 5 mg, 0.5 mg. Base solution: Take 140 grams of ammonium chloride, 13 grams of sodium sulfite dissolved in water, add 333 ml of ammonia, diluted with water to 1000 ml.