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Electrodeposition on pyrolytic graphite platforms for electrothermal atomic-absorption spectroscopic determination of labile lead in saline water

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Publication Date
Volume
38
Issue
4
Identifiers
DOI: 10.1016/0039-9140(91)80074-a

Abstract

Abstract A technique for the determination of labile Pb in sea-water has been developed which uses co-deposition with mercury on 6–14-mg pyrolytic graphite platforms, followed by electrothermal atomization of the deposit. Optimization of the applied voltage, pH and sodium chloride concentration with respect to the deposition efficiency yielded a detection limit of 0.15 μg/l. Pb for 120-sec depositions with a single platform. As the amount of deposit increases linearly with deposition time up to 5 min and the simultaneous use of two platforms increases the analytical signal by a factor of 1.73, a further improvement is possible. Near-shore sea-water and estuarine water samples containing lead in the concentration range 0.4–1.3 μg/l. were analysed with an RSD better than 10%. Background correction was not required as the technique eliminates spectral interferences due to molecular absorption.

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