Mineral-organic composite for immobilizing Pb in soil subjected to aided phytostabilization

The content of Pb in the surface layer of soil is largely connected with the influence of anthropogenic factors. The degradation of soil caused by the presence of increased heavy metal contents has led to the search for or improvement of effective remediation methods. The study made use of the technique of aided phytostabilisation for immobilizing Pb in the soil using a composite based on dolomite and compost (CDC) as a soil amendment, as well as Lolium perenne L. The efficiency was assessed in terms of determining the Pb content in the soil, roots and above-ground parts of the test plant with the use of the atomic absorption spectrometry method. The application of CDC to soil had a positive influence on increasing the production of plant biomass and the pH of the soil, with the Pb being higher in the roots than in the above-ground parts of Lolium perenne L. Upon completing the experiment, the soil amendment was found to have had a positive influence on decreasing the average Pb content in the soil (by 18%) as well as the CaCl2-extractable Pb forms (23%). In the case of the contents of this element in the roots and above-ground parts, on the other hand, the influence was +53% and –36% respectively.

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