The color reaction conditions of Cu 2+ and 1-(2-pyridylazo)-2-naphthol(PAN)were researched, and a new method was developed for the determination of copper in sulfuric acid anodizing liquor.

研究了铜与1-（2-吡啶偶氮）-2-萘酚（PAN）的显色反应，建立了测定硫酸阳极氧化液中铜的新方法。

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The excessive EDTA standard solution was titrated using copper sulfate with PAN as indicator so as to obtain nickel content.

以PAN为指示剂用硫酸铜标准溶液滴定过量的EDTA标准溶液，从而求得镍的含量。

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Transfer the mixture to an 11- or 12-quart copper preserving pan or a wide nonreactive kettle.

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