论文部分内容阅读
用示波极谱阳极溶出法作三氯化金试剂(分析纯)中痕量铜铅的定量测定,以玻璃碳电极为工作电极。用环戊醇苹取试样水溶液中的大量基体元素Au~(3+),用还原剂还原剩余在水相中的少量 Au~(3+),在 pH=3.3的 HCl 介质中,作阳极溶出测定铜,富积电位-0.6伏(VS.SCE,下同),富积时间2分钟,铜溶出峰电位-0.11伏。测完铜后,用双硫腙-四氯化碳革取掉铜,剩余水相作阳极溶出测定铅,富积电位-1.5伏,富积时间2分钟,铅溶出峰电位-0.55伏。本方法可测至1ppb 的铜和10ppb 的铅,两者回收率平均误差分别为+4%和-7%。
Using oscillopolarographic anodic dissolution method for the quantitative determination of trace copper and lead in gold trichloride reagent (analytical grade), the glassy carbon electrode was used as the working electrode. A large amount of matrix element Au ~ (3+) in aqueous sample was extracted with cyclopentanol, and a small amount of Au ~ (3+) remaining in the aqueous phase was reduced with a reducing agent. The solution was treated in an HCl Dissolution of copper, accumulation potential of -0.6 volts (VS.SCE, the same below), enrichment time of 2 minutes, copper dissolution peak potential of -0.11 volts. After the copper was measured, the copper was removed with dithizone-carbon tetrachloride and the remaining aqueous phase was subjected to anodic dissolution to determine lead. The accumulated potential was -1.5 volts, the enrichment time was 2 minutes, and the lead dissolution peak potential was -0.55 volts. The method can be measured to 1ppb of copper and 10ppb of lead, the average recovery of the two were + 4% and -7%.