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《Acta Scientiae Circumstantiae》 2012-06
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The effects of sepiolite on immobilization remediation of Cd contaminated red soil

SUN Yuebing1,2,XU Yingming1,2,*,SHI Xin3,WANG Lin1,2,LIANG Xuefeng1,2 1.Department of Pollution Control,Agro-Environmental Protection Institute of Ministry of Agriculture,Tianjin 300191 2.Key Laboratory of Original Agro-Environmental Quality of Ministry of Agriculture and Tianjin Key Laboratory of Agro-environment and Food Safety,Tianjin 300191 3.College of Environment and Resources,Jilin University,Changchun 130012  
Pot experiment was conducted to investigate the effects of sepiolite on soil pH,available Cd concentration,and spinach dry biomass,quality and safety.The results showed that under the Cd contamination of 1.25,2.5 and 5 mg · kg-1,the application of sepiolite significantly increased soil pH(p0.05),while the available Cd contents decreased by 11.0%~44.4%,7.3%~23.0% and 4.1%~17.0%,respectively,with the increase of sepiolite concentration,when compared with unamended soil.The dry biomass of spinach was observed a certain degree increase due to the alleviation of Cd phytotoxicity to spinach by using sepiolite.In contrast,the concentrations of Cd in the shoots of spinach significantly decreased after applying sepiolite to soil,and reduced by 78.6%~300.4%,44.6%~169.0% and 18.1%~89.3%,respectively,with respect to the control group.Under soil Cd concentration of 1.25 mg · kg-1,the concentration of Cd in the edible parts of spinach at ≥ 1% sepiolite was lower than 0.2 mg · kg-1 fresh weight(FW),the maximum permissible concentration(MPC) for Cd in vegetable(GB 2762—2005).Under 2.5 and 5 mg · kg-1 Cd contaminated soil,it met the MPC of pollution-safe cultivars(PSCs) when the treatment of sepiolite was up to 5%.
【Fund】: 国家自然科学基金(No.21107056 21177068 4901154);; 中央级公益性科研院所基本科研业务费专项;; 农业部农林科研杰出人才及其创新团队支持资金~~
【CateGory Index】: X53
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