【摘 要】
：
CaCl2,citric acid(CA),EDTA,HCl and FeCl3 were employed to assess Cd,Pb and Zn removal after single soil and multiple soil washings.A modified European Community Bureau of Reference(BCR)sequential extr
【机 构】
：
College of Resource and Environment,Fujian Agriculture and Forestry University,Fuzhou,China
【出 处】
：
The 17th International Conference on Heavy Metals in the Env
论文部分内容阅读
CaCl2,citric acid(CA),EDTA,HCl and FeCl3 were employed to assess Cd,Pb and Zn removal after single soil and multiple soil washings.A modified European Community Bureau of Reference(BCR)sequential extraction was also conducted to evaluate Cd,Pb and Zn fractionations and their mobility in the washed soils.Among these chemicals,after soil washing FeCl3 extracted Cd,Pb and Zn as much as or higher than citric acid(CA),EDTA and HCl solutions.CaCl2 could extract part of Cd but poor in Pb and Zn from contaminated soil.In most cases,easily reducible fraction Cd,Pb and Zn were removed after FeCl3 washing,meanwhile exchangeable/acid extractable fraction of metals were higher than other chemicals in the washed soils.Multiple soil washing enhanced the removal of exchangeable/acid extractable and easily reducible fractions of metals after CA,EDTA,HCl and FeCl3,but there was no heavy metals fractionated differences during single and multiple CaCl2 soil washing.In addition,multiple soil washing led to decrease of DTPA-extracted of availability metals and metals mobility compared to single soil washing,except for CaCl2 multiple soil washing that improved availability metals concentrations,thus,higher MI(mobility index)values obtained,compared to single soil washing.Therefore,multiple soil washing was not suitable for CaCl2.Additionally,soils after chemicals single/multiple soil washing sometimes obtained higher MI values than the untreated soil,which should pay more attention.
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