Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 192, Issue 3, Pages 1616-1622Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2011.06.086
Keywords
Dissolved organic matter; Cadmium; Sedum alfredii; Sorption; Zinc
Categories
Funding
- National Natural Science Foundation of China [40701074]
- Hi-Tech Research and Development Program of China [2009AA06Z316]
- EU [2011DFA101222]
- Zhejiang Provincial Natural Science Foundation of China [Y5080172, Y3090072]
- Chinese Universities
Ask authors/readers for more resources
Pot experiments were conducted to investigate the changes of the dissolved organic matter (DOM) in the rhizosphere of hyperaccumulating ecotype (HE) and non-hyperaccumulating ecotype (NHE) of Sedum alfredii and its effects on Zn and Cd sorption by soils. After planted with HE, soil pH in the rhizosphere reduced by 0.5-0.6 units which is consistent with the increase of DOM. The hydrophilic fractions (51%) in DOM from the rhizosphere of HE (HE-DOM) was much greater than NHE-DOM (35%). In the presence of HE-DOM, Zn and Cd sorption capacity decreased markedly in the following order: calcareous clay loam > neutral clay loam > acidic silty clay. The sorption isotherms could be well described by the Freundlich equation (R(2) > 0.95), and the partition coefficient (K) in the presence of HE-DOM was decreased by 30.7-68.8% for Zn and 20.3-59.2% for Cd. as compared to NHE-DOM. An increase in HE-DOM concentration significantly reduced the sorption and increased the desorption of Zn and Cd by three soils. DOM derived from the rhizosphere of the hyperaccumulating ecotype of S. alfredii could significantly reduce metal sorption and increase its mobility through the formation of soluble DOM-metal complexes. (C) 2011 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available