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| Effects of low molecular weight organic acids coupled with water management on cadmium and arsenic speciation in soil |
| Received:February 28, 2024 |
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| KeyWord:low molecular weight organic acids（LMWOAs）;orthogonal experiment;available Cd;available As;phytoremediation |
| Author Name | Affiliation | E-mail | | YIN Xuefei | Hunan Academy of Agricultural Sciences, Hunan Institute of Agro-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China
Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | LIU Saihua | Hunan Academy of Agricultural Sciences, Hunan Institute of Agro-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China
Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | liusaihua55029@163.com | | JI Xionghui | Hunan Academy of Agricultural Sciences, Hunan Institute of Agro-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China
Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | CHEN Jie | Hunan Academy of Agricultural Sciences, Hunan Institute of Agro-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China
Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | XIE Yunhe | Hunan Academy of Agricultural Sciences, Hunan Institute of Agro-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China
Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | PAN Shufang | Hunan Academy of Agricultural Sciences, Hunan Institute of Agro-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China
Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | TIAN Faxiang | Hunan Academy of Agricultural Sciences, Hunan Institute of Agro-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China
Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | |
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| Abstract: |
| In order to enhance the bioavailability of cadmium（Cd）and arsenic（As）in soil and optimize the efficacy of phytoremediation, a series of orthogonal experiments were conducted to investigate the impact of distinct treatments on the speciation and bioavailable state of Cd and As in soil, in conjunction with varying types and doses of low molecular weight organic acids and different water conditions. The optimal treatment conditions for the activation effect of Cd and As were subsequently identified. The results demonstrated that：The application of 5 mmol·kg-1 citric acid in soil, combined with dry and wet alternation of soil promoted the transformation of soil Cd into the high bioavailability form to the greatest extent. The weak acid-soluble fraction accounted for 60.94% of the total Cd in the soil, while the oxidizable fraction of low fluidity exhibited the lowest content among all treatments, only 13.18%. The application of 2.5 mmol·kg-1 malic acid to soil coupled with the long-term flooding depth of 5-6 cm, was found to be the most effective method for facilitating the conversion of As in soil to a highly bioavailable form. In the treated soil, the sum of the water-extracted As and surface-adsorbed As accounted for the largest proportion of all treatments, which was 9.05%. The content of Fe-Al bounded As was 38.65%, while the Ca-bounded As content was 3.37%. Theoretically, C2B4A1（alternating dry and wet, 10 mmol ·kg-1 tartaric acid）was the treatment with the highest content of bioavailable Cd in soil, and C3B1A3（flooding depth of 2-3 cm, 0 mmol·kg-1 tartaric acid）was the treatment with the highest content of bioavailable As in soil. Compared with other factors, flooding had a very significant impact on soil available As（P<0.01）. Studies showed that applying low dose of citric acid to soil and simultaneously treating the soil alternately with dry and wet could facilitate the release of Cd, and applying low dose of malic acid combined with flooding treatment could activate soil As better. |
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