Mechanisms of copper immobilization in Fluvisol after thecarbon sorbent applying

Abstract

Biochar is widely used sorbent for soil remediation but the mechanism of its effect onimmobilization of metals and particular processes of metal transformation are still unclear.We designed an incubation experiment to investigate the impact of wood biochar to copper(Cu) contamination in Calcaric Fluvisols Loamic. The efficiency of biochar implementation forreduction of Cu mobility in soil has been studied using combined method of heavy metalfractioning (Minkina et al., 2013). It was shown that the use of sorbent into polluted soilresults in the change of fraction-group composition of metal compounds, fixation of Cu due toreduction of weakly bound forms and increase of the part of residual and metal fractionsstrongly bound with organic matter. Decrease of pollutant mobility occurs along an increaseof the dose of a sorbent. The greater effect was observed after use of biochar in theconcentration 2.5 %. Thus, the present study demonstrates the possible remediation of soilcontaminated by heavy metals using biochar and provides a particular strategy forremediation of soils contaminated with Cu.