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Methods are described for the determination of low percentages of gallium and lead in aluminum alloys using anion exchange chromatography and atomic absorption spectrophotometry. Limits of quantitation can be lowered by at least an order of magnitude over methods without preconcentration. With minor modifications, the method for gallium can be applied to the determination of trace levels of iron, zinc, and cadmium. The lower limits of measurement using 1-g samples are 0.001% for both gallium and lead. Using larger sample weights, the limits for both elements can be lowered to at least 0.0005%.
aluminum alloys, analyzing, gallium, lead (metal), iron, zinc, anion exchange, hydrochloric acid, atomic absorption
Research associate, Kaiser Aluminum and Chemical Corporation, Center for Technology, Pleasanton, CA