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Electrothermal atomic absorption spectrometric determination of cadmium and lead in blood using flow injection on-line sorption preconcentration in a knotted reactor



Electrothermal atomic absorption spectrometric determination of cadmium and lead in blood using flow injection on-line sorption preconcentration in a knotted reactor



Spectrochimica Acta Part B Atomic Spectroscopy 53(6-8): 1041-1048



A flow injection on-line sorption separation system combining a knotted reactor (KR) and two sorbent extraction columns was developed for the electrothermal atomic absorption spectrometric determination of (ultra) trace amounts of cadmium and lead in freeze-dried blood samples. The diethyldithiophosphate complexes of the analytes were selectively adsorbed on the inner walls of the PTFE KR. The chelating reagent was on-line purified using conical sorbent extraction columns packed with 20 mg of C18 bonded silica gel. The collected analyte complexes were quantitatively eluted from the 100 cm KR with 35 mul of methanol and the eluate was directly introduced into a pyrolytically coated graphite tube pretreated with iridium modifier. Enhancement factors of 26 and 99 and detection limits of 0.2 and 1.6 ng l-1 were obtained for cadmium and lead, respectively. The relative standard deviation was 2.1% for 0.02 mug l-1 cadmium and 2.7% for 0.2 mug l-1 lead. The spike recovery was between 90 and 100%. The results from the analysis of biological reference materials agreed with the certified or indicated values.

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Accession: 008595801

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DOI: 10.1016/s0584-8547(98)00097-4


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