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Simultaneous determination of Cd and Pb in foodstuffs by electrothermal atomic absorption spectrometry by P.R.M. Correia; E. Oliveira; P.V. Oliveira is a Chemistry article available to read on EtoBox.

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A method for the simultaneous determination of cadmium and lead in foodstuffs by electrothermal atomic absorption spectrometry (ETAAS) with a transversely heated graphite atomizer (THGA) and Zeeman-effect background corrector is proposed. The samples (0.500 g) were digested to clear solutions with 5.0 ml concentrated nitric acid in a closed vessel microwave oven. Among various chemical modifiers tested, the best recovery and repeatability results were obtained with a 0.5% (w/v) NH 4 H 2 PO 4 + 0.03% (w/v) Mg(NO 3 ) 2 mixture. The pyrolysis and atomization temperatures for the simultaneous determination of cadmium and lead were 750 and 1600 • C, respectively. Tests carried out with several individual concomitants were performed and did not reveal significant interference on cadmium and lead atomization. Characteristic masses were 1.46 pg for cadmium (RSD = 4.0%) with 8.0% for reproducibility and 36.7 pg for lead (RSD = 2.6%) with 2.0% for reproducibility. The detection limits obtained were 0.38 pg (n = 20, 3δ) for cadmium and 9.3 pg (n = 20, 3δ) for lead. The relative standard deviations based on five measurements for each of the reference solutions (0.25-4.0 g Cd 2+ l -1 ) and (2.5

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Author

P.R.M. Correia; E. Oliveira; P.V. Oliveira

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

2000

Language

EN

Field

Chemistry (Physical Sciences)