Improvement in soil and sorghum health following the application of polyacrylate polymers to a Cd-contaminated soil

JOURNAL OF HAZARDOUS MATERIALS

卷:173

Article

Guiwei, Q.^1,4  de Varennes, A.¹  Martins, L. L.¹  Mourato, M. P.¹  Cardoso, A. I.¹  Mota, A. M.²  Pinto, A. P.³  Goncalves, M. L.² 

[1] Univ Tecn Lisboa, Inst Super Agron, Dept Agr & Environm Chem, P-1349017 Lisbon, Portugal

[2] Univ Tecn Lisboa, Inst Super Tecn, Dept Chem Engn, P-1049001 Lisbon, Portugal

[3] Univ Evora, ICAM, P-7000 Evora, Portugal

[4] Shenyang Agr Univ, Soil & Environm Coll, Shenyang 110161, Liaoning Prov, Peoples R China

关键词: Cadmium;    Enzymatic activities;    Oxidative stress;    Polyacrylate polymers;    Sorghum;   

DOI  :  10.1016/j.jhazmat.2009.08.124

来源: Elsevier

【 摘 要 】

Contamination of soils with cadmium (Cd) is a serious global issue due to its high mobility and toxicity. We investigated the application of insoluble polyacrylate polymers to improve soil and plant health. Sorghum was grown in a Cd-contaminated sandy soil. Polyacrylate polymers at 0.2% (w/w) were added to half of the soil. Control soil without plants was also included in the experiment. Growth of sorghum was stimulated in the polymer-amended soil. The concentration of Cd in the shoots, and the activities of catalase and ascorbate peroxidase decreased in plants from polymer-amended soil compared with unamended control. The amount Of CaCl2-extractable Cd in the polymer-amended soil was 55% of that in the unamended soil. The Cd extracted in sorghum shoots was 0.19 mg per plant grown on soil without polymer and 0.41 mg per plant grown on polymer-amended soil. The total amount of Cd removed from each pot corresponded to 1.5 and more than 6% of soil CaCl2-extractable Cd in unamended and polymer-amended soil, respectively. The activities of soil acid phosphatase, beta-glucosidase. urease, protease and cellulase were greatest in polymer-amended soil with sorghum. In conclusion, the application of polyacrylate polymers to reduce the bioavailable Cd pool seems a promising method to enhance productivity and health of plants grown on Cd-contaminated soils. (C) 2009 Elsevier B.V. All rights reserved.

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