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| Effect of water-retaining agent on themorphology of Cd in soil and its' bioavailability |
| Received:July 27, 2016 |
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| KeyWord:water-retaining agent;cadmium;ryegrass;soil contamination |
| Author Name | Affiliation | E-mail | | QIN Duan-duan | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | YAO Fen-xia | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095, China | | | CHEN Ya-jun | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | XU Bing | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | ZHOU Yan | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | ZHAO Hai-tao | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095, China | | | WANG Xiao-zhi | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095, China | | | FENG Ke | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095, China | fengke@yzu.edu.cn |
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| Abstract: |
| Water-retaining agents(WRAs) have recently been proposed for remediation of heavy metal contaminated soils, but their impacts on morphology of heavy metals are not well understood. To investigate effects of WRAs application on cadmium(Cd) morphological transformation in soil and Cd uptake by plants, a pot experiment was conducted for 60 days with and with no ryegrass at WRAs(active ingredient:polyacrylic acid sodium salt-PAAS) application rates of 0‰,2‰,4‰ and 8‰. The results showed that WRAs reduced Cd accumulation in aboveground part of ryegrass. Compared to control, total soil Cd concentrations decreased by more than 20% and 36% in WRA treatments with no and with plants, respectively. The sorption of soluble Cd in soil solution by PAAS facilitates the dissolution of insoluble Cd species, which is further enhanced by the complexation with the root exudates. Thus, the Cd morphology transforms in the following order:residue state→oxidized state→reduced state→acid soluble state. Overall, PAAS application increased chemical activity of Cd on one hand, and reduced its short-term bioavailability on the other hand. However, a long-term botanical experiment is needed to find out the desorption potential of Cd-loaded PAAS before WRAs can be widely used to remediate Cd contaminated soil. |
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