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| Effects of the chelator on Solanum nigrum L. remediation of cadmium polluted soil in Chengdu Plain |
| Received:March 21, 2016 |
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| KeyWord:cadmium;pH;Solanum nigrum L.;chelator;phytoremediation;Chengdu Plain |
| Author Name | Affiliation | E-mail | | LI Shi-hong | School of Environment and Resource of Southwest University of Science and Technology, Geological Engineering, Mianyang 621010, China
Sichuan Geological Survey, Chengdu 610081, China | | | LIANG Bin | School of Environment and Resource of Southwest University of Science and Technology, Geological Engineering, Mianyang 621010, China
Sichuan Geological Survey, Chengdu 610081, China | earlliuh@163.com | | LI Zhong-hui | Sichuan Geological Survey, Chengdu 610081, China | |
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| Abstract: |
| Selected two kinds of soil about different cadmium pollution and different pH in Chengdu Plain Mianzhu Area. A pot culture experiment was designed to study the effects of two kinds of chelator(citric acid and EDTA) on Solanum nigrum L. remediation of cadmium polluted soil and the changes of soil pH. The results showed that with the increase of the concentration of the citric acid, the biomass of Solanum nigrum L. in high pollution soil(MZT-01),whose Cd content was 1.29 mg·kg-1,was declined; while the biomass in low pollution soil(MZT-02), whose Cd content was 0.89 mg·kg-1, was significantly risen and reached a maximum when the citric acid was 5 mmol·kg-1.When the citric acid was 5 mmol·kg-1, under the stress of Cd in two kinds of soil, the content, the absorptive amount and enrichment factors of Solanum nigrum L. could rise to the maximum, and the phytoremediation effect was the best. EDTA poisoned Solanum nigrum L. and the absorption effect was lower than the control group when EDTA was 1 mmol·kg-1. Chelator had a greater influence on pH of the neutral soil,pH from 6.35 to 5.57, but almost had no influence on pH of the acid soil. |
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