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Determination of ionic alkyllead compounds in water by gas chromatography/atomic absorption spectrometry.

Ionic alkyllead compounds are extracted from water samples into pentane by complexation with sodium diethyldithiocarbamate. Inorganic lead is complexed with EDTA. The organic phase is evaporated to dryness by vacuum distillation, after which butylation with n-butyl Grignard reagent is carried out in a microvolume of n-nonane. The analysis is performed by gas chromatography with atomic absorption spectrometric detection. The effects of various parameters on the analytical performance are discussed. With 500 mL of water, detection limits for individual species are situated at the ng.L/sup -1/ level.