Abstract
Traces of Bi, Cd, Hg, Pb and Tl in the lower μ·g−1 range are determined by direct electrothermal atomic absorption spectrometry in samples of about 5 mg of metallic gallium (Sr about 0.1). Electrolytically spiked samples of high-purity gallium are used for calibration. For the analysis of high-purity gallium (7–8 N) the limit of detection of Bi, Hg and Pb can be simply improved for 2–3 orders of magnitude by previous partial dissolution of larger weighed samples in acid according to [2]. The accuracy of the analytical results was verified by ICP mass spectrometry.
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