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Resolution of DPASV Overlapping Peaks of Indium and Cadmium in Trace Analysis of High Purity Gallium Arsenide

M. Rievaj and D. Bustin

Department of Analytical Chemistry, Faculty of Chemical Technology, Slovak Technical University, SK-812 37 Bratislava


Abstract: Computer-aided resolution of overlapping differential pulse anodic stripping voltammetry peaks of ln and Cd is proposed for trace determination in high purity gallium arsenide. It is based on the fact that the signal of ln appears only if the analyzed solution contains chlorides, while Cd produces signal even in the chloride-free medium. The signal of Cd obtained in the GaAs sample solution in HNO3 is corrected to the chloride-containing medium before subtraction from the sum of unresolved peaks of ln and Cd registered in the GaAs sample solution in the HNO3-HCl mixture. The procedure was tested on ultrapure GaAs samples spiked with Cd and ln. It was then applied to trace analysis of Cd and ln of some industrial high purity GaAs samples.

Full paper in Portable Document Format: 482a88.pdf


Chemical Papers 48 (2) 88–90 (1994)

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