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Título
Factors Influencing the Soil–Air Partitioning and the Strength of Soils as a Secondary Source of Polychlorinated Biphenyls to the Atmosphere
Autor
Año del Documento
2011-05-03
Editorial
American Chemical Society
Descripción
Producción Científica
Documento Fuente
Environ. Sci. Technol. May 2011, n. 45, p. 4785–4792
Abstract
Soils are a major reservoir of persistent organic pollutants, and soil-air partitioning and exchange are key processes controlling the atmospheric concentrations and regional fate of pollutants. Here, we report and discuss the concentrations of polychlorinated biphenyls (PCBs) in soils, their measured fugacities in soil, the soil-air partition coefficients (KSA) and soil-air fugacity gradients in rural background areas of N-NE Spain and N-NW England. Four sampling campaigns were carried out to assess seasonal and daily variability and differences between sampling sites. KSA values were significantly dependent on soil temperature and soil organic matter quantity, and to a minor extent organic matter type. All the PCB congeners in the soil are close to equilibrium with the atmosphere at rural Ebro sites, but soil fugacities tend to be higher than ambient air fugacities in early and late summer, consistent with the influence of temperature on soil-air partitioning. Therefore, during warm periods, soils increment their strength as secondary sources to the atmosphere. The mixture of PCBs found in the atmosphere is clearly strongly influenced by the mixture of PCBs which escape from soil, with significant correlations between them (R2 ranging between 0.35 and 0.74 and p-level
ISSN
0013-936X
Revisión por pares
SI
Patrocinador
This research project was founded by the European Commission under the Global Change and Ecosystems (FP6) WaterCycle and Soil Related Aspects (AQUATERRA, Project number505428 GOCE). Financial support from Spanish Ministry of Education and Science (Project number CTM2005-25168-E) is also acknowledged
Propietario de los Derechos
American Chemical Society
Idioma
eng
Tipo de versión
info:eu-repo/semantics/publishedVersion
Derechos
openAccess
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