Journal
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume 58, Issue 1, Pages 43-50Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0584-8547(02)00215-X
Keywords
cadmium determination; on-line preconcentration; activated carbon; drinking water
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An on-line cadmium preconcentration and determination system implemented with inductively coupled plasma optical emission spectrometry associated to flow injection was studied. Cadmium was retained as Cd-8-hydroxyquinoline complex at pH 10.0. The cadmium complex was removed from the conical minicolumn packed with activated carbon with 20% (v/v) nitric acid. An enrichment factor of 80-fold for a sample volume of 50 ml was obtained. The detection limit (DL) value for the preconcentration of 50 ml of sample was 18 ng l(-1). The relative standard deviation was 2.5%, calculated from the peak heights obtained. The calibration graph using the preconcentration system for cadmium was linear with a correlation coefficient of 0.9995 at levels near the DLs up to at least 100 ng ml(-1). The method was successfully applied to the determination of total cadmium in drinking water samples. (C) 2002 Elsevier Science B.V. All rights reserved.
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