Long-Term Fate of Polychlorinated Biphenyls and Polycyclic Aromatic Hydrocarbons in an Agricultural Soil

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• 作者：Kieron J. Doick ; Eva Klingelmann ; Peter Burauel ; Kevin C. Jones ; and Kirk T. Semple
• 刊名：Environmental Science & Technology
• 出版年：2005
• 出版时间：May 15, 2005
• 年：2005
• 卷：39
• 期：10
• 页码：3663 - 3670
• 全文大小：363K
• 年卷期：v.39,no.10(May 15, 2005)
• ISSN：1520-5851

文摘

Laboratory studies are useful for understanding thebehavior of persistent organic pollutants (POPs) in soil,although such investigations do not always relate directlyto field conditions. Outdoor lysimeter studies may beused to overcome this problem. This work aimed to investigatethe behavior of two polycyclic aromatic hydrocarbons(PAHs) (fluoranthene and benzo[a]pyrene) and twopolychlorinated biphenyls (PCBs; congeners 28 and 52) insoil, using lysimeters established in 1990 at the AgrosphereInstitute (Forschungszentrum Jülich GmbH, Germany). Thetwo PAHs were in one lysimeter, and the PCBs were ina second lysimeter. A further aim of the study was to determinesoil half-lives for each of the contaminants. The overalldecline in PAH concentrations was considerably greaterthan for the PCBs over the 152 month study. The PCBs exhibitedgreater chemical extractability than the PAHs and weredemonstrated to have migrated through the soil column toa greater extent than the PAHs. Loss of PCBs fromsurface soil was not considered to have been congenerspecific for the two PCB congeners in this study. The twoPAHs varied in their extents of total loss and movementthrough the soil column. Soil half-lives were determined as10.9 y for [¹²C]PCB 28, 11.2 yr for [¹²C]PCB 52, 2.7 yr for benzo[a]pyrene, and 32 d (phase 1) to 38 yr (phase 2) forfluoranthene. These are shown to disagree with someprevious estimates of POP half-lives in soil, suggesting thatprevious studies underestimated persistence by 10-foldor more.