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| Arsenic Availability and Speciation in Soils Treated with Exogenous Arsenic-resistant Fungi and Zero-valent Iron |
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| KeyWord:arsenic contamination; microbe; zero-valent iron; effect |
| Author Name | Affiliation | | LIU Yun-lu | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/ The Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China | | LI Lian-fang | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/ The 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/ The Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China | | LIU Xiao-shi | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/ The Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China | | SU Shi-ming | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/ The Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China | | DUAN Ran | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/ The 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/ The 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/ The Key Laboratory for Agro-Environment, Ministry of Agriculture PRC, Beijing 100081, China |
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| Abstract: |
| Through indoor soil incubation experiment, arsenic availability and speciation in soil treated with exogenous arsenic-resistant fungi（Trichoderma asperellum L.） and zero-valent iron were explored. The results showed that when the exogenous arsenic-resistant fungi was added into soils, both the content of water soluble arsenic and the of content NaHCO3 extractable arsenic increased steadily with the prolonging incubation time , indicating that the arsenic-resistant fungi promoted the release and dissolution of arsenic from soils, and when the experiment lasted for 30 days, the increasing percentage of soluble arsenic content in soils ranged from 3.9% to 10.7% compared to the control treatment. Only arsenate[As（Ⅴ）] was found out, and arsenic of other species including arsenite[As（Ⅲ）], dimethylarsinic acid（DMA）, monomethylarsonic acid（MMA） was not detected. With exogenous zero-valent iron added into soils, the reduced percentage of available arsenic in soils extracted by NaHCO3 ranged from 76.5% to 90.4%. Compared to the zero-valent iron treatment, the available arsenic in soils increased significantly（P<0.05） under the treatment of exogenous arsenic-resistant fungi and zero-valent iron, and the stabilization efficiency decreased 7.0%~11.1% due to more available arsenic absorbed. The mechanism of activated arsenic in soils resulted from exogenous arsenic-resistant fungi maybe connected with the transformation from residual phase of arsenic to non-specifically sorbed one. The stabilization of arsenic due to the addition of exogenous zero-valent iron into soils may be related to the transformation process from non-specifically sorbed arsenic to residual phase and amorphous and poorly-crystalline hydrous oxides of Fe and Al phase. The addition of arsenic-resistant fungi T. asperellum resulted in the enhancement of available arsenic of soils treated with iron power in certain degree, which is not so obvious in short term. |
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