Analyte preconcentration and separation from small volumes by electrodeposition for electrothermal atomic absorption spectroscopy.
Electrodeposition of Pb from 50 mul volumes of 0.1M KCl solution was studied by electrolysis at uncontrolled potentials of 4.0-6.0 V on a pyrolytic graphite platform cathode. Deposition efficiency was evaluated as a function of time by ASV measurements on aliquots of the electrolysed solution. Quantitative separation of the analyte from the matrix was achieved in a relatively short time, aided by convective stirring of the sample achieved through gas evolution. Thus, the feasibility of rapid electrodeposition directly in a pyrolytic graphite-coated furnace has been demonstrated, allowing construction of an automated electrodeposition-electrothermal atomic absorption spectroscopic system.
Matousek
J P
JP
Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch, New Zealand.
J Powell
H K
HK