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| Immobilization effect of earthworm/modified biochar on arsenic in contaminated red soil |
| Received:September 23, 2020 |
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| KeyWord:modified biochar;earthworm;pH value;arsenic;soil |
| Author Name | Affiliation | E-mail | | SU Qian-qian | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Key Laboratory of Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | | | LI Lian-fang | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Key Laboratory of Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | lilianfang@caas.cn | | ZHU Chang-xiong | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Key Laboratory of Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | | | YE Jing | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Key Laboratory of Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | | | LIU Xue | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Key Laboratory of Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | | | HUANG Xiao-ya | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Key Laboratory of Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | |
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| Abstract: |
| In order to explore the immobilization effect of cerium manganese modified biochar(MBC) and earthworms on contaminated red soil, a biological simulation experiment was carried out using the earthworm Eisenia foetida, which has a high tolerance to heavy metal pollution in soils, and the results showed that earthworms significantly decreased water soluble arsenic content and reduced the pH of the soil. When the earthworms were combined with MBC, the immobilization effect was more obvious. The content of water-soluble arsenic in soil decreased by 77.59%, and the pH decreased by 0.84 units compared with the control at the same period, indicating a synergistic inactivation of earthworms and MBC on arsenic(As) in soils. It also illustrated that the combination of earthworms and MBC in soils led to the conversion of active arsenic to a stable form, which showed the conversion of As species from non-specifically sorbed and specifically sorbed phases to non-crystallized hydrous oxides of Fe and Al, well-crystallized hydrous oxides of Fe and Al, and residual ones. This investigation indicates that the modified biochar combined with Eisenia foetida greatly decreases the mobility of As in soils, and therefore reduces the corresponding environmental risk, and the application of biochar or MBC has no significant effect on the survival of earthworms. Therefore, the use of earthworms combined with MBC is a promising method for the remediation of As contaminated red soil. |
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