The pot experirments showed that the distribu-tion of pb,Zn,and Cd in three polluted soils were obviouslydifferent. In ore tailing particle of mine drainage pollut soils ,the majorities of Pb,Zn,and Cd were found to be in residualfraction, But in soil adding heavy Tnetals, most of Pb wasweak acid extractable or bound to organic matter and the ma-jority of Zn or Cd was exchangable,Soybean seedlings biocon-centrate Zn or Cd more powerful in soil adding pollutants than that...
