Release of Cd immobilized by soil constituents and its bioavailability |
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Authors: | Ewa Kurek Malgorzata Majewska |
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Institution: | Department of Environmental Microbiology, Institute of Microbiology and Biotechnology , University of M. Curie — Sklodowska , 19 Akademicka St., Lublin, 20–033, Poland |
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Abstract: | Release of Cd immobilized by soil constituents (clay, humic acids, bacterial cells) in vitro and under soil conditions and its bioavailability to lettuce were studied. The most resistant to extraction with 0.02 M EDTA in vitro as well as under soil conditions was cadmium immobilized by humic acids during decomposition of contaminated plant residues but Cd‐dead cells when 0.1 M NaNO3 was the extractant. Cadmium addition (3 mg kg‐1) to soil and its form were without effect on plant growth and amount of metal accumulated in roots. Tops of plants grown in soil supplemented with Cd‐resting cells contained significantly less metal then other ones. |
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Keywords: | Cadmium immobilization soil constituents environmental factors retention bioavailability |
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