The Fluvisol and sediment trace element contamination level as related to their geogenic and anthropogenic source

Abstract

The upper values of the extractability of trace elements (As, Be, Cd, Co, Cr, Cu, Ni, Pb and Zn) in 2 mol/L HNO 3 and 0.025 mol/L ethylenediaminetetraacetic acid (EDTA) (compared with their pseudototal content in aqua regia) for determination of prevailing anthropogenic and geogenic soil load were proposed and compared with the results of the other 30 Fluvisol samples collected from the Labe fluvial zone. The increased geogenic load of Fluvisols was confirmed in the case of Be and As in some localities where low extractability with increased pseudototal contents were detected as opposed to the other elements when their increased pseudototal contents were followed by their increased extractability. The maps of probability of increased geogenic soil load in the area of the Czech Republic based on the comparison of geological substrates and trace element load were constructed. The combination of proposed elements extractability values for geogenic load together with developed maps is a suitable tool for the definition of prevailing Fluvisol or sediment load on some localities in the whole area of the Czech Republic. The results can be also a useful tool in the decision making processes regarding dredged sediment application on agricultural soil (support tool for legislative norms, Direction No. 257/2009 Sb.).

The role of Mn and Fe oxides in risk elements retention in soils under different forest types

“…Relative amount (related to pseudototal content) of arsen (As), cadmium (Cd), lead (Pb) and zinc (Zn) (As rel , Cd rel , Pb rel and Zn rel ) associated with manganese (Mn) oxides fraction (beige box) or associated with iron (Fe) oxides fraction (brown box) divided according to forest categories in horizon 3 (hor3). The Y-axis was log-transformed to be visually compatible with the results of performed ANOVAs (Vaněk et al 2005, Vácha et al 2013. As Cd rel and Zn rel were found to be elevated in Fluvisols, the Pb rel was smaller in this category, which could be explained as the consequence of leaching of Pb from oxides, which was observed by Ash et al (2015).…”

“…63, 2017, No. 5: 213-219 doi: 10.17221/116/2017-PSE fluvisols (Vácha et al 2013) and on the problem of anthropogenic contamination of fluvisols by Cd in general (Zerling et al 2006). In the literature, Pb is reported to adsorb onto Mn oxides more efficiently than Fe oxides, especially due to the large specific surface areas and low isoelectrical point of Mn oxides (Feng et al 2007).…”