In situ stabilization remediation of cadmium contaminated soils of wastewater irrigation region using sepiolite |
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Authors: | Yuebing Sun Guohong Sun Yingming Xu Lin Wang Dasong Lin Xuefeng Liang and Xin Shi |
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Institution: | Key Laboratory of Original Environmental Quality Safety, Ministry of Agriculture, Tianjin 300191, China. E-mail:sunyuebing2008@yahoo.com.cn;Tianjin Key Laboratory of Agro-environment and Agro-product Safety, Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin 300191, China;Department of Basic Science, Tianjin Agricultural University, Tianjin 300384, China;Key Laboratory of Original Environmental Quality Safety, Ministry of Agriculture, Tianjin 300191, China. E-mail:sunyuebing2008@yahoo.com.cn;Key Laboratory of Original Environmental Quality Safety, Ministry of Agriculture, Tianjin 300191, China. E-mail:sunyuebing2008@yahoo.com.cn;Tianjin Key Laboratory of Agro-environment and Agro-product Safety, Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin 300191, China;Key Laboratory of Original Environmental Quality Safety, Ministry of Agriculture, Tianjin 300191, China. E-mail:sunyuebing2008@yahoo.com.cn;Tianjin Key Laboratory of Agro-environment and Agro-product Safety, Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin 300191, China;Key Laboratory of Original Environmental Quality Safety, Ministry of Agriculture, Tianjin 300191, China. E-mail:sunyuebing2008@yahoo.com.cn;Tianjin Key Laboratory of Agro-environment and Agro-product Safety, Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin 300191, China;College of Environment and Resources, Jilin University, Changchun 130012, China |
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Abstract: | The effects of immobilization remediation of Cd-contaminated soils using sepiolite on soil pH, enzyme activities and microbial communities, TCLP-Cd (toxicity characteristic leaching procedure-Cd) concentration, and spinach (Spinacia oleracea) growth and Cd uptake and accumulation were investigated. Results showed that the addition of sepiolite could increase soil pH, while the TCLP-Cd concentration in soil was decreased with increasing sepiolite. The changes of soil enzyme activities and bacteria number indicated that a certain metabolic recovery occurred after the sepiolite treatments, and spinach shoot biomass increased by 58.5%–65.5% in comparison with the control group when the concentration of sepiolite was ? 10 g/kg. However, the Cd concentrations in the shoots and roots of spinach decreased with an increase in the rate of sepiolite, experiencing 38.4%–59.1% and 12.6%–43.6% reduction, respectively, in contrast to the control. The results indicated that sepiolite has the potential for success on a field scale in reducing Cd entry into the food chain. |
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Keywords: | Cd-contaminated soil immobilization remediation sepiolite soil quality |
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