Phytoextraction of metals from a multiply contaminated soil by Indian mustard

被引：152
作者：
Quartacci, M. F.
Argilla, A.
Baker, A. J. M.
Navari-Izzo, F.
机构：
[1] Univ Pisa, Dipartimento Chim & Biotecnol Agrarie, I-56124 Pisa, Italy
[2] Univ Melbourne, Sch Bot, Parkville, Vic 3010, Australia
来源：
CHEMOSPHERE | 2006年 / 63卷 / 06期
关键词：
Brassica juncea; chelates; desorption; metals; phytoextraction; phytoremediation;
D O I：
10.1016/j.chemosphere.2005.09.051
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The effects of nitrilotriacetate (NTA) and citric acid applications on metal extractability from a multiply metal-contaminated soil, as well as on their uptake and accumulation by Indian mustard (Brassica juncea) were investigated. Desorption of metals from the soil increased with chelate concentration, NTA being more effective than citric acid in solubilising the metals. Plants were grown in a sandy soil collected from a contaminated field site and polluted by Cd, Cr, Cu, Pb and Zn. After 43 days of plant growth, pots were amended with NTA or citric acid at 5 mmol kg(-1) soil. Control pots were not treated with any chelate. Harvest of plants was performed I week after chelate addition. Soil water-, NH4NO3- and DTPA-extractable Cd, Cu, Pb and Zn fractions were enhanced only in the presence of NTA. In comparison to unamended plants, Indian mustard shoot dry weights suffered significant reductions following NTA application. NTA treatment increased shoot metal concentrations by a factor of 2-3, whereas citric acid did not induce any difference compared to the control. Chromium was detected in the above-ground tissues only after NTA amendment. Due to differences in dry matter yield, a significant enhancement of metal uptake was observed in NTA-treated plants for Cu and Zn. (c) 2005 Elsevier Ltd. All rights reserved.
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收藏
页码：918 / 925
页数：8
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