TY - JOUR
T1 - Predictivity strength of the spatial variability of phenanthrene sorption across two sandy loam fields
AU - Soares, Antonio
AU - Paradelo Pérez, Marcos
AU - Møldrup, Per
AU - Delerue-Matos, Cristina
AU - de Jong, Lis W.
PY - 2015
Y1 - 2015
N2 - © 2015 Springer International Publishing Switzerland. Sorption is commonly agreed to be the major process underlying the transport and fate of polycyclic aromatic hydrocarbons (PAHs) in soils. However, there is still a scarcity of studies focusing on spatial variability at the field scale in particular. In order to investigate the variation in the field of phenanthrene sorption, bulk topsoil samples were taken in a 15?×?15-m grid from the plough layer in two sandy loam fields with different texture and organic carbon (OC) contents (140 samples in total). Batch experiments were performed using the adsorption method. Values for the partition coefficient K d (L kg-1) and the organic carbon partition coefficient K OC (L kg-1) agreed with the most frequently used models for PAH partitioning, as OC revealed a higher affinity for sorption. More complex models using different OC compartments, such as non-complexed organic carbon (NCOC) and complexed organic carbon (COC) separately, performed better than single K OC models, particularly for a subset including samples with Dexter n?-1. The selected threshold revealed that K OC-based models proved to be applicable for more organic fields, while two-component models proved to be more accurate for the prediction of K d and retardation factor (R) for less organic soils. Moreover, OC did not fully reflect the changes in phenanthrene retardation in the field with lower OC content (Faardrup). Bulk density and available water content influenced the phenanthrene transport mechanism phenomenon.
AB - © 2015 Springer International Publishing Switzerland. Sorption is commonly agreed to be the major process underlying the transport and fate of polycyclic aromatic hydrocarbons (PAHs) in soils. However, there is still a scarcity of studies focusing on spatial variability at the field scale in particular. In order to investigate the variation in the field of phenanthrene sorption, bulk topsoil samples were taken in a 15?×?15-m grid from the plough layer in two sandy loam fields with different texture and organic carbon (OC) contents (140 samples in total). Batch experiments were performed using the adsorption method. Values for the partition coefficient K d (L kg-1) and the organic carbon partition coefficient K OC (L kg-1) agreed with the most frequently used models for PAH partitioning, as OC revealed a higher affinity for sorption. More complex models using different OC compartments, such as non-complexed organic carbon (NCOC) and complexed organic carbon (COC) separately, performed better than single K OC models, particularly for a subset including samples with Dexter n?-1. The selected threshold revealed that K OC-based models proved to be applicable for more organic fields, while two-component models proved to be more accurate for the prediction of K d and retardation factor (R) for less organic soils. Moreover, OC did not fully reflect the changes in phenanthrene retardation in the field with lower OC content (Faardrup). Bulk density and available water content influenced the phenanthrene transport mechanism phenomenon.
KW - Sorption
KW - Soil organic carbon
KW - Complexed organic carbon
KW - Non-complexedorganic carbon
KW - Phenanthrene
KW - Field-scale
KW - Leaching risk
KW - Sorption
KW - Soil organic carbon
KW - Complexed organic carbon
KW - Non-complexedorganic carbon
KW - Phenanthrene
KW - Field-scale
KW - Leaching risk
U2 - 10.1007/s11270-015-2305-x
DO - 10.1007/s11270-015-2305-x
M3 - Journal article
SN - 0049-6979
VL - 226
JO - Water, Air and Soil Pollution
JF - Water, Air and Soil Pollution
IS - 36
ER -