Chemical composition of soil contaminated with tri- and hexavalent chromium amended with compost, zeolite and calcium oxide

The studies involved determining the influence of Cr(III) and Cr(VI), as well as compost, zeolite and calcium oxide on the content of selected macronutrients and trace elements in soil in which oats were grown. An increase in the content of total chromium, manganese, zinc and nickel took place along with increasing contamination with Cr(III) and Cr(VI). In pots with Cr(VI), the addition of compost significantly increased the contents of copper, zinc and cobalt in the analyzed soil as compared to the control groups. The application of calcium oxide significantly limited the content of copper and cobalt in pots with trivalent chromium, and nickel in pots with Cr(VI); it also contributed to an increase in the contents of chromium and copper (pots with Cr(VI)).