Citric acid as a masking agent for high concentrations of nickel in the determination of selenium by hydride generation atomic-absorption spectrometry

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Abstract
Citric acid has a masking effect on nickel when present in the determination of selenium by the hydride generation-atomic-absorption technique. Satisfactory signals are obtained for 10 µg l–1 of selenium in the presence of 1600 mg l–1 of nickel(II). The determination of selenium in nickel samples is then possible, provided a suitable acid mixture is used for dissolution. However, the standard additions calibration procedure is still necessary.