NDLI: Elevated CO$_{2}$ concentration increase the mobility of Cd and Zn in the rhizosphere of hyperaccumulator Sedum alfredii

Content Provider	Springer Nature Link
Author	Li, Tingqiang Tao, Qi Liang, Chengfeng Yang, Xiaoe
Copyright Year	2014
Abstract	The effects of elevated CO$_{2}$ on metal species and mobility in the rhizosphere of hyperaccumulator are not well understood. We report an experiment designed to compare the effects of elevated CO$_{2}$ on Cd/Zn speciation and mobility in the rhizosphere of hyperaccumulating ecotype (HE) and a non-hyperaccumulating ecotype (NHE) of Sedum alfredii grown under ambient (350 μl l$^{−1}$) or elevated (800 μl l$^{−1}$) CO$_{2}$ conditions. No difference in solution pH of NHE was observed between ambient and elevated CO$_{2}$ treatments. For HE, however, elevated CO$_{2}$ reduced soil solution pH by 0.22 unit, as compared to ambient CO$_{2}$ conditions. Elevated CO$_{2}$ increased dissolved organic carbon (DOC) and organic acid levels in soil solution of both ecotypes, but the increase in HE solution was much greater than in NHE solution. After the growth of HE, the concentrations of Cd and Zn in soil solution decreased significantly regardless of CO$_{2}$ level. The visual MINTEQ speciation model predicted that Cd/Zn–DOM complexes were the dominant species in soil solutions, followed by free Cd$^{2+}$ and Zn$^{2+}$ species for both ecotypes. However, Cd/Zn–DOM complexes fraction in soil solution of HE was increased by the elevated CO$_{2}$ treatment (by 8.01 % for Cd and 8.47 % for Zn, respectively). Resin equilibration experiment results indicated that DOM derived from the rhizosphere of HE under elevated CO$_{2}$ (HE-DOM-E) (90 % for Cd and 73 % for Zn, respectively) showed greater ability to form complexes with Cd and Zn than those under ambient CO$_{2}$ (HE-DOM-A) (82 % for Cd and 61 % for Zn, respectively) in the undiluted sample. HE-DOM-E showed greater ability to extract Cd and Zn from soil than HE-DOM-A. It was concluded that elevated CO$_{2}$ could increase the mobility of Cd and Zn due to the enhanced formation of DOM–metal complexes in the rhizosphere of HE S. alfredii.
Starting Page	5899
Ending Page	5908
Page Count	10
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	21
Issue Number	9
e-ISSN	16147499
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-01-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Complexation Dissolved organic matter Elevated CO$_{2}$ Hyperaccumulator Heavy metal Speciation Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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