| Mitigation effects of silicon rich amendments on heavy metal accumulation in rice (Oryza sativa L.) planted on multi-metal contaminated acidic soil. | |
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MedLine Citation:
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PMID: 21470654 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The mechanisms of stabilization by silicon-rich amendments of cadmium, zinc, copper and lead in a multi-metal contaminated acidic soil and the mitigation of metal accumulation in rice were investigated in this study. The results from a pot experiment indicated that the application of fly ash (20 and 40gkg(-1)) and steel slag (3 and 6gkg(-1)) increased soil pH from 4.0 to 5.0-6.4, decreased the phytoavailability of heavy metals by at least 60%, and further suppressed metal uptake by rice. Diffusion gradient in thin-film measurement showed the heavy metal diffusion fluxes from soil to solution decreased by greater than 84% after remediation. X-ray diffraction analysis indicated the mobile metals were mainly deposited as their silicates, phosphates and hydroxides in amended treatments. Moreover, it was found metal translocation from stem to leaf was dramatically restrained by adding amendments, which might be due to the increase of silicon concentration and co-precipitation with heavy metals in stem. Finally, a field experiment showed the trace element concentrations in polished rice treated with amendments complied with the food safety standards of China. These results demonstrated fly ash and steel slag could be effective in mitigating heavy metal accumulation in rice grown on multi-metal contaminated acidic soils. |
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Authors:
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Hai-Hong Gu; Hao Qiu; Tian Tian; Shu-Shun Zhan; Teng-Hao-Bo Deng; Rufus L Chaney; Shi-Zhong Wang; Ye-Tao Tang; Jean-Louis Morel; Rong-Liang Qiu |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-4 |
Journal Detail:
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Title: Chemosphere Volume: - ISSN: 1879-1298 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0320657 Medline TA: Chemosphere Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier Ltd. All rights reserved. |
Affiliation:
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School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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