State Key Laboratory for Pollution Control and Resource Reuse，School of the Environment，Nanjing University，Nanjing，210023，China
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Published
2016-07-23
Issue Date
2016-07-23
Abstract
Heavy metal contamination in soil is seriously threating the grain production and food safety，constraining the sustainable development of the economy and society.There have been a lot of studies about remediation of heavy metals in acidic soil，but little is known about the insitu stabilized remediation of cadmium(Cd)in alkaline soil.In this study，we chose eight different stabilizers(fused calciummagnesium phosphate，silicon fertilizer，lime，coconut shell biochar，rice straw biochar，wood biochar，peach pit biochar and bamboo biochar)，applied them to the remediation of the alkaline soil contaminated with Cd，screened out the more effective stabilizers，and checked their ecological risk using wheat.Results show that all the stabilizers applied could induce dosedependent passivation effect on Cd in soil，but coconut shell biochar is more effective than other seven stabilizers.2.0% coconut shell biochar in soil stabilized up to 99.08% of available Cd，and could remain the bioavailable Cd at a relative low level for more than 250 days.In addition，the application of coconut shell biochar also promoted the wheat growth and decreased Cd concentrations in wheat.1.5% coconut shell biochar in soil decreased the Cd concentrations in root and shoot by 64.31% and 69.60% respectively when compared with the control group.By speciation analysis，coconut shell biochar showed its ability in transforming Cd from the bioavailable form to the stable form in soil.It decreased the proportion of watersoluble and exchangeable forms of Cd and increased that of organicbound and residual forms.Results prove that coconut shell biochar could not only remediate the Cd contaminated alkaline soil in longterm，but also significantly improve the soil conditions and promote the plant growth.
Zhang Qingquan，Yin Ying*，Du Wenchao，Guo Hongyan .
Stabilization of cadmium in alkaline soil[J]. Journal of Nanjing University(Natural Sciences), 2016, 52(4): 601
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References
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