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| Influence of organic acids on As (Ⅴ) aging in soils |
| Received:February 20, 2017 |
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| KeyWord:arsenate;soil aging;organic acids;available As;combined As |
| Author Name | Affiliation | E-mail | | GAO Xue | Institute of Agricultural Resources and Environment, Tibet Academy of Agricultural and Animal Husbandry Science, Lhasa 850000, China
Ministry of Agriculture Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZENG Xi-bai | Ministry of Agriculture Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | zengxibai@caas.cn | | BAI Ling-yu | Ministry of Agriculture Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | Nyima Tashi | Institute of Agricultural Resources and Environment, Tibet Academy of Agricultural and Animal Husbandry Science, Lhasa 850000, China | | | SU Shi-ming | Ministry of Agriculture Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | WANG Ya-nan | Ministry of Agriculture Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | WU Cui-xia | Ministry of Agriculture Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | |
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| Abstract: |
| Incubation experiments were conducted to study the influence of different organic acids(acetic acid, oxalic acid, citric acid, and humic acid) on the aging process of arsenic(As aging) in quaternary red clay. The results indicated that the influence was not significant at 25℃ and at the maximum field moisture capacity of 70%, while the organic acid amounts significantly affected available As and combined As in soils. Acetic acid added at 50 and 100 mg·kg-1 inhibited As aging in soils, while acetic acid added at 200 mg·kg-1 promoted As aging. However, oxalic acid and citric acid added at 50 mg·kg-1 promoted As aging and the inhibition was observed at 100 and 200 mg·kg-1. Arsenic aging in soils was significantly inhibited after adding humic acid and comparatively, less significant effects were detected with other organic acids. Acetic acid and oxalic acid addition at 50~200 mg·kg-1 significantly decreased the specifically sorbed As. Citric acid and humic acid added at 50~100 mg·kg-1 significantly increased the amorphous and poorly-crystalline hydrous Fe/Al oxides associated with As. Acetic acid, citric acid, and humic acid addition at 200 mg·kg-1 significantly increased the well-crystalline hydrous Fe/Al oxides associated with As. These observations will not only provide an understanding of the effects of different types of organic acids on the release, migration, and transformation of As in soil, but also will be the reference for the regulation and safe use of As-contaminated soils. |
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