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据文献论述,抗坏血酸有显著的还原性,可将许多金属离子还原为低价状态,当pH值在1～2.5时能将Fe~(3+)、Hg~(2+)、Ca~(2+)还原为Fe~(2+)、Hg~+、Cu~+,pH值为3.5～4时,可将多种金属离子还原为低价状态,如Mn~(7+)还原成Mn~(2+),还可将Ag~+、Au~(3+)、Hg~(2+)还原为元素态,当pH值为4～5时,可还原As等元素,在此酸度下用他去除溶液中氧的效果也很好。 为应用抗坏血酸的上述性能,以掩蔽对测定氧化铜粉中锌的干扰而作了一系列试验,结果表明,本法去除干扰简单,快速易行,整个分析过程无需过滤和长时间的放置就可得到清晰无色的测定液,且准确度、精密度均比较好,锌量在0.5～25mg/100ml时,浓度与波高呈线性关系。
According to the literature, ascorbic acid has significant reducibility, and many metal ions can be reduced to a low-cost state. Fe ~ (3 +), Hg ~ (2 +), Ca ~ (2 +), Hg ~ +, Cu ~ +, the pH value of 3.5 ~ 4, a variety of metal ions can be reduced to a low state, such as Mn ~ (7 +) reduced to Mn ~ (2+). Ag ~ +, Au ~ (3 +) and Hg ~ (2+) can also be reduced to the elemental state. When the pH value is from 4 to 5, elements such as As can be reduced, His effect of removing oxygen in solution is also good. In order to apply the above properties of ascorbic acid, a series of experiments were conducted to mask the interference of zinc in copper oxide powder. The results show that this method has the advantages of easy removal of interference, fast and easy operation, no need to filter and long time to place the whole analysis process Clear and colorless liquid was obtained, and the accuracy and precision were better. When the amount of zinc was 0.5 ~ 25mg / 100ml, the concentration and wave height were linear.