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Extraction as a method for preparation of vegetable samples for the determination of trace metals by atomic absorption spectrometry

✍ Scribed by Elzbieta Wieteska; Anna Zióek; Anna Drzewińska

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
528 KB
Volume
330
Category
Article
ISSN
0003-2670

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✦ Synopsis

An alternative, simple and rapid technique was developed for a quantitative isolation of the group of eight elements: Al, Ca, Cd, Cu, Fe, Mg, Pb and Zn from vegetable material samples in an open system with the use of acids: cont. HCl, dil. HN03 and hydrofluoric acids. Equivalence of both the extractants, HCl and HNOs, was found suitable for a quantitative isolation of Ca, Cu, Mg, Zn, Pb and Cd. For lead and cadmium, however, dil. HNOs proved to be more suitable because these elements are determined by the graphite furnace atomic absorption spectrometty (GF-AAS) technique. A quantitative dissolution of Al and Fe requires hydrofluoric acid as an additional extractant. The proposed method allows to obviate the organic matrix destruction stage, shorten the analyte dissolution time, reduce cost, and minimize hazards of loss and contamination. Validity and versatility of the method developed was verified by the analysis of standard reference materials.

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