Microwave assisted extraction for trace element analysis of plant materials by ICP-AES |
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Authors: | J Borkowska-Burnecka |
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Institution: | (1) Department of Chemistry, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland, PL |
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Abstract: | Application of microwave assisted extraction for the decomposition and dissolution of plant samples for trace metal determination
by ICP-AES was examined. Dried onion, leaves of spinach beet and three reference materials CTA-OTL-1, CTA-VTL-2 and CL-1 were
analyzed. Water, EDTA and hydrochloric acid (0.01, 0.10 and 1.0 M, respectively) were used as leaching solutions. The extraction
efficiency was investigated by comparison of the results with those obtained after microwave wet digestion. HCl was found
to be very suitable for quantitative extraction of B, Ba, Cd, Cu, Mn, Ni, Pb, Sr and Zn from the samples. For reference materials,
the measured concentrations are well consistent with the certified values. The use of EDTA led to a complete extraction of
B, Cd, Ni, Pb, Sr and Zn. Water was found to be a good leaching solution for boron. For extraction with HCl and EDTA, the
RSD values for the concentrations measured were below 8% for most of the elements.
Received: 4 May 2000 / Revised: 20 June 2000 / Accepted: 22 June 2000 |
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