RT info:eu-repo/semantics/article
T1 Ubiquitous Net Volatilization of Polycyclic Aromatic Hydrocarbons from Soils and Parameters Influencing Their Soil−Air Partitioning
A1 Cabrerizo, Ana
A1 Dachs, Jordi
A1 Moeckel, Claudia
A1 Ojeda, María-José
A1 Caballero, Gemma
A1 Barceló, Damià
A1 Jones, Kevin C.
AB Soils are a major reservoir of organic pollutants, and soil-air partitioning and exchange are key processes controlling the regional fate of pollutants. Here, we report and discuss the soil concentrations of polycyclic aromatic hydrocarbons (PAHs), their soil fugacities, the soil-air partition coefficients (KSA) and soil-air gradients for rural and semirural soils, in background areas of N-NE Spain and N-NW England. Different sampling campaigns were carried out to assess seasonal variability and differences between sampling sites. KSA values were dependent on soil temperature and soil organic quantity and type. Soil fugacities of phenanthrene and its alkyl homologues were 1-2 orders of magnitude higher than their ambient air fugacities for all sampling sites and periods. The soil to air fugacity ratio was correlated with soil temperature and soil redox potential. Similar trends for other PAHs were found but with lower fugacity ratios. The ubiquitous source of PAHs from background soils to the atmosphere found in all temperate regions in different seasons provides an indirect evidence of potential in situ generation of two to four ring PAHs and their alkyl homologues in the surface soil. We discuss this hypothetical biogenic source and other potential processes that could drive the high soil to air fugacity ratios of some PAHs.
PB American Chemical Society
SN 0013-936X
YR 2011
FD 2011
LK https://uvadoc.uva.es/handle/10324/65149
UL https://uvadoc.uva.es/handle/10324/65149
LA spa
NO Environ. Sci. Technol. 2011, 45, 4740–4747
NO Producción Científica
DS UVaDOC
RD 25-nov-2024