Journal
ENVIRONMENTAL POLLUTION
Volume 182, Issue -, Pages 248-255Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2013.07.025
Keywords
Cadmium; Complexation; Dissolved organic matter; Hyperaccumulator; Lead; Zinc
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Funding
- National Natural Science Foundation of China [41271333]
- National Key Technology R&D Program of China [2012BAC17B04]
- Fundamental Research Funds for the Central Universities, China
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The complexation of Zn, Cd and Pb with dissolved organic matter (DOM) in the rhizosphere of hyperaccumulating ecotype (HE) and a non-hyperaccumulating ecotype (NHE) of Sedum alfredii was measured using resin equilibration method. After the growth of HE S. alfredii, the rhizosphere soil pH was reduced by 0.27-0.33 units, due to enhanced DOM derived from root exudation. For both ecotypes of S. alfredii, the fraction of free metal as a percentage of soluble metal varied from 22.1 to 42.5% for Zn2+, from 8.1 to 15.5% for Cd2+, and from 4.5 to 10.4% for Pb2+. Resin equilibration experiment results indicated that HE DOM had greater ability to form complexes with Zn, Cd and Pb than NHE DOM, Visual MINTEQ model gave excellent predictions of the complexation of Zn and Cd by DOM (R-2 > 0.97). DOM in the rhizosphere of HE S. alfredii could significantly increase metal mobility through the formation of soluble DOM-metal complexes. (C) 2013 Elsevier Ltd. All rights reserved.
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