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| Effects of Bone Char and Nano-iron on Fractions and Availability of Arsenic in Contaminated Red Soils |
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| KeyWord:nano-iron, pig bone char, cow bone char, soil available arsenic, residual arsenic |
| Author Name | Affiliation | | HE Jing | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China | | YIN Guang-cai | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | | LI Lian-fang | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China | | ZENG Xi-bai | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China | | LIN Qin-tie | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | | SU Shi-ming | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China | | WANG Ya-nan | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China | | WU Cui-xia | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China |
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| Abstract: |
| Chemical stabilization is an option of in situ remediation of heavy metal contaminated soils. The effectiveness of this technique is dependent on the chemical stabilizers. A laboratory incubation experiment was conducted to examine the effects of three materials, including nano-iron, pig bone char and cow bone char on chemical forms and availability of arsenic in two different red soils（slate and limestone red soil） with different arsenic contents. After 84 days of incubation, addition of nano-iron significantly reduced soil available arsenic contents by 10.5% and 11.43%, and pH value by 0.18 and 0.23 unit, respectively, in slate red soil and limestone red soil, and the stabilization of arsenic by nano-iron may be connected with the transformation from non-specifically sorbed phase to residual one. However, the addition of pig bone char led to an increase of available arsenic by 16.21% in slate red soil and 1.36% in limestone soil. Applying cow bone char to limestone red soil showed stabilizing effect on arsenic by promoting the transformation of soil arsenic from available to residual form, improving soil quality. The results suggest that nano-iron material shows great prospect in stabilizing arsenic in soils and that cow bone char could be used for immobilization of arsenic in limestone red soil. |
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