Abstract
The proposed method for the determination of Cr in gallium arsenide is based on the catalytic activity of chromium(VI)-DTPA complex in the presence of nitrate ions. After dissolution of gallium arsenide with hydrochloric and nitric acids and volatilization of arsenic, chromium is oxidised to chromate with potassium chlorate in nitric acid. After nitric acid removal, the 0.012 M DTPA — 2.5 M LiNO3 supporting electrolyte buffered with 0.2 M CH3COONa — 0.05 M CH3COOH is directly added to the residue. Differential pulse polarography of this solution provides a detection limit of about 100 ng g−1, with a relative standard deviation of ±2–5% and a reproducible calibration curve up to at least 1 μg of Cr(VI) ml−1.
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