Comparison of Sequential Extraction methods with Reference to Zinc fractions in Contaminated soils
1,2. B. Gworek1, 3. A. Mocek
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1. Institute of Environmental Protection, ul. Krucza 5/11, 00-548 Warsaw, Poland
2. Department of Soil Environment Sciences, Warsaw Agricultural University, Warsaw, Poland
3. Department of Soil Science, Poznan Agricultural University, Poland
Pol. J. Environ. Stud. 2003;12(1):41–48
The total amount of zinc extracted from soils in the Legnicko-Gogowski Copper Mining Region using either McLaren and Crawford or Tessier et al. method differed within the limits of 2 - 35%, while the application of the latter method yielded higher results for 86% of analysed samples. Amongst zinc fractions analysed using McLaren and Crawford method the fraction of zinc specifically bound and less easily exchangeable dominates in horizons where there is the accumulation of organic matter while in the remaining horizons - the residual fraction. Whereas when the Tessier et al. method was used the residual fraction dominated in all the genetic horizons of soils under study. The smallest amounts of zinc, regardless the method applied, were found in the fraction embracing ions found in the soil solution and those easily exchangeable. The quantity of mobile zinc - accessible for plants - calculated on the basis of sequential extraction according to McLaren and Crawford procedure amounts up to 14-54% while the quantity obtained by Tessier et al. method amounts up to 6-28% of total zinc value. A significant difference was found in accumulation horizons and amounted 40-54% and 8-28% respectively. The share of organic substance in zinc binding was smallest when assessed on the basis of sequential analysis according to McLaren and Crawford. While in case of applying the method by Tessier et al. the smallest amounts of zinc were bound to carbonates, sulphates and phosphates.