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《Acta Scientiae Circumstantiae》 2011-05
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In-situ immobilization of cadmium and lead in a contaminated agricultural field by adding natural clays combined with phosphate fertilizer

LIANG Xuefeng1,2,XU Yingming1,2,WANG Lin1,2,SUN Guohong3,QIN Xu1,2,SUN Yang1,2 1.Department of Pollution Control,Agro-Environmental Protection Institute of Ministry of Agriculture,Tianjin 300191 2.Key Laboratory of Production Environment and Agro-product Safety of Ministry of Agriculture and Tianjin Key Laboratory of Agro-environment and Food Safety,Tianjin 300191 3.Department of Elementary Science,Tianjin Agriculture University,Tianjin 300384  
In-situ immobilization field experiments were carried out in a cadmium and lead contaminated agricultural field in Tianjin.Lactuca sativa L,Brassica campestris L and Raphanus sativus were selected as model vegetables.Phosphate fertilizer,natural clays such as sepiolite and bentonite,and composites of the above were employed as immobilization materials for heavy metal pollution.The effects of immobilization materials on the biomass of vegetables,the concentrations of cadmium and lead in the edible parts and speciation transformation of cadmium and lead were investigated.It was found that the phosphate fertilizer and its composite with sepiolite or bentonite could increase the biomass of vegetables.All the immobilization materials decreased the cadmium and lead contents in the vegetables to different degrees.The composite of sepiolite and phosphate fertilizer had the best performance,and the contents of cadmium in Lactuca sativa L and Brassica campestris L were below the level of national standard for food safety.All the immobilization treatments inhibited the bioavailability of heavy metals by reducing the contents of exchangeable fractions and increasing the residual fraction of heavy metals.Therefore using natural clays combined with phosphate fertilizer is efficient for the in-situ remediation of cadmium and lead contaminated agricultural fields.
【Fund】: 国家高技术研究发展计划项目(No.2008AA06Z334);; 国家自然科学基金(No.40901154);; 天津市自然科学基金(No.08JCYBJC02200 10JCYBJC06300) ;; 中央级公益性科研院所基本科研业务费专项(No. 2010-lxf-2)~~
【CateGory Index】: X53
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