Evaluation of extraction/digestion techniques used to determine lead isotopic composition in forest soils |
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| Authors: | Michael Komárek Vladislav Chrastný Vojtěch Ettler Pavel Tlustoš |
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| Institution: | (1) Department of Agrochemistry and Plant Nutrition, Czech University of Agriculture in Prague, Kamycká 129, 165 21 Prague 6, Czech Republic;(2) Department of Chemistry, University of South Bohemia, Studentská 13, 370 05 České Budějovice, Czech Republic;(3) Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic |
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| Abstract: | Lead isotopic studies in soils provide an efficient tool for tracing the sources of lead pollution. Five different extraction/digestion
techniques (0.05 M EDTA, 0.5 M HNO3, 2 M HNO3, aqua regia, total digestion) were used for lead isotopic composition (206Pb/207Pb) determination in three forest soil profiles with different kinds of prevailing Pb contamination (unpolluted area, smelting
area and vicinity of a motorway). The results obtained showed that all extraction/digestion methods used for the determination
of 206Pb/207Pb ratios in surface horizons containing high organic matter contents gave statistically identical values (according to the
Tukey test). In mineral soil horizons, differences between the individual extraction/digestion methods could be observed (the
lowest 206Pb/207Pb ratios were obtained from EDTA extracts, corresponding to weakly bound anthropogenic lead, and the highest 206Pb/207Pb ratios were obtained from total digestion). The combination of total digestion and EDTA extraction (labile lead fraction)
seems to be the optimal combination for 206Pb/207Pb ratio determination and optimal result interpretation. |
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| Keywords: | Pb isotopes 206Pb/207Pb Forest soil Extraction procedure Digestion procedure |
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