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痕量铜的分析在环保监测工作中已受到很大注意.近年来,用催化光度法测定 ppb 级铜的报导很多,但用催化荧光法测定痕量铜的报导还不多.我们在荧光法测定水中痕量氰化物的工作中发现,在弱碱性介质中有痕量铜存在时,H_2O_2氧化无色荧光素的反应被催化,反应速度大大加快.本文详细地研究了该催化反应的条件,并用作催化荧光法测定痕量铜的新指示反应.方法灵敏度很高(0.4ppb),选择性尚好,操作简单,适用于井水、自来水等
Trace copper analysis has received great attention in environmental monitoring work.In recent years, there are a lot of reports on the determination of ppb copper by catalytic spectrophotometry, but there are not many reports on the determination of trace copper by catalytic fluorimetry. Determination of trace amounts of cyanide in water found that in a weak alkaline medium trace amounts of copper present, H_2O_2 oxidation of the colorless fluorescein reaction was catalyzed, the reaction rate greatly accelerated.In this paper, the conditions of the catalytic reaction , And is used as a new indicator reaction for the determination of trace copper by catalytic fluorimetry.The method has high sensitivity (0.4ppb), good selectivity and simple operation, and is suitable for well water, tap water, etc.