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本文研究了在非离子型胶束TritonX－100体系中，以1－（2-吡啶偶氮）－2一萘酚（PAN）为显色剂，用二阶导数分光光度法消除镉的干扰，与乙醇介质比较，测定灵敏度提高，测定镉样中微量钢，结果较为满意。
In this paper, we investigated the interference of cadmium by second derivative spectrophotometry in the nonionic micellar TritonX-100 system using 1- (2-pyridylazo) -2-naphthol (PAN) Compared with the ethanol medium, the determination of sensitivity increased, the determination of trace amounts of cadmium in steel, the results are more satisfactory.