Zinc in separated sequentialfractions from six soils on the slopes of the Siedlce high plain

The aim of the study was to evaluate the total content of zinc in the fractions separated from the soils located in two transects on the moraine slope of the Siedlecka High Plain (some situated above and some beneath the underground municipal landfill site). The highest total content of zinc was detected in the soils situated beneath the underground municipal landfill site. The sequential fractioning was performed by the Zeien-Brümmer method. The speciation analysis revealed that this metal was bound to different components of the soil solid phase. The highest percentage of zinc content was detected in the residual fraction F7 in the parent rock horizons and the lowest was noted in the bioavailability fractions, i.e. exchangeable F2 and easilyeasily soluble F l. In transects A and B of the tested soils significant correlations were found between the content of zinc in the separated fractions and its total content, the total content of iron and manganese, clay fraction <0.002 mm, cation exchange capacity (CEC) as well as between the content of carbon organic compound and zinc in the F4 organic fraction.