Evaluation of extraction/digestion techniques used to determine lead isotopic composition in forest soils

Komárek, Michael; Chrastný, Vladislav; Ettler, Vojtčch; Tlustoš, Pavel
August 2006
Analytical & Bioanalytical Chemistry;Aug2006, Vol. 385 Issue 6, p1109
Academic Journal
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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