In-Place Inactivation of Pb in Pb-Contaminated Soils

详细信息    查看全文

• 作者：William R. Berti and Scott D. Cunningham
• 刊名：Environmental Science & Technology
• 出版年：1997
• 出版时间：May 1997
• 年：1997
• 卷：31
• 期：5
• 页码：1359 - 1364
• 全文大小：203K
• 年卷期：v.31,no.5(May 1997)
• ISSN：1520-5851

文摘

There has been increasing attention to the use of soilamendments and green plants to remediate surface soilscontaminated with Pb. We call one form of thistechniquein-place inactivation. In-place inactivation reducesthehazards associated with contaminated soils through theuse of chemicals that change the molecule species of thePb to stabilize the soil Pb chemically and physicallyinsitu. We have seen significant changes in soil Pbchemistry,Pb leached from soil, and Pb measured by a physiologicallybased extraction test (PBET) after incorporatinginexpensive and readily available materials to threesoils.The soils have total Pb concentrations that rangefrom1200 to 3500 mg kg^-1. The leachable soilPb was significantlyreduced in all cases from as high as 30 mg PbL^-1 to belowthe regulatory limit of 5 mg Pb L^-1 aftersoil treatment.The PBET mimics the mammalian gastric-intestinaltractsolutions. In the simulated intestinal phase of thePBET,Pb in solution was reduced by 72% in one of the soilstreatedwith a high Fe-containing industrial byproduct. Theseresults help to illustrate the utility of incorporatingsoilamendments to reduce hazards associated with Pb-contaminated soils.