Determination of traces of copper and aluminium in zinc by gas chromatography with the microwave plasma detector

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説明

The usefulness of a microwave plasma detector* in the gas chromatography of volatile metal cheIates has been demonstrated by uszw3 and by other workers’. This detector is highly sensitive and selective, and has been successfully applied to the determination of beryllium, aluminium and chromium (as acetylacetonates and as trifluoroacetylacetonates) and of, e.g., scandium, iron and copper as trifluoroacetylacetonates. However, its application to the analysis of metal samples for impurities present at the low ppm level has not been reported. This paper describes the determination of traces of copper and aluminium in zinc metal by using this detector. The trace elements were extracted into trifiuoroacetyiacctone (TFA)-chIoroForm from the sample solution at pH 4.5, and the organic phase was concentrated by evaporation and injected into a gas chromatograph. To minimize decomposition of the metal chelates in the injection port and/or the chromatographic column, TFA vapour was introduced into the carrier-gas stream.

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