《常用电镀溶液的分析》一书对酸性镀铜液中铜的测定例举了三种方法,其中之一为碘量法。在实际应用中,误差甚大。原因在镀液中的杂质铁以Fe~(2+)和少量的Fe~(3+)形式存在,方法中对Fe~(3+)的干扰作了掩蔽,却忽视了Fe~(2+)的影响。据资料(Anal.Chem.,1952,24,1618)介绍,在氟化物溶液介质中,Fe~(3+)是很强的还原剂,必须在加碘化物前使Fe~(2+)完全氧化。 The book “Analysis of commonly used plating solution,” a book on the determination of copper in acidic copper plating solution to illustrate three methods, one of which is the iodometric method. In practical application, the error is very big. The reason is that iron in the bath exists in the form of Fe 2+ and a small amount of Fe 3+. The method masks the interference of Fe 3+ and ignores Fe 2+. )Impact. According to the data (Anal. Chem., 1952,24,1618) introduced in the fluoride solution medium, Fe ~ (3 +) is a very strong reducing agent, must be added before iodide Fe ~ (2+) Oxidation.