DETERMINATION OF CADMIUM IN TOBACCO-SMOKE AND ZINC IN TAP WATER BY SOLVENT-EXTRACTION FLAME ATOMIC-ABSORPTION SPECTROMETRY

Procedures are described for the determination of cadmium in tobacco smoke and zinc in tap water by flame atomic absorption spectrometry after chelation with benzyl 2-pyridyl ketone 2-pyridylhydrazone and extraction with isobutyl methyl ketone. Calibration graphs in the organic layer were linear up to 1.3 mu g/ml, with sensitivities of 80 ng/ml (Zn) and 71 ng/ml (Cd), and limits of detection of 49 ng/ml for zinc and 38 ng/ml for cadmium. RSD values were 2.9% at 0.42 mu g/ml (Cd) and 4.7% at 0.17 mu g/ml (Zn).