Journal Article

PreJuSER-44720

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Equilibrium partitioning of 14C-benzo(a)pyrene and 14C-benazolin between fractionated phases from an arable topsoil

Séquaris, J.-M.FZJ* ; Lavorenti, A. ; Burauel, P.FZJ*

2005
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.envpol.2004.10.018

Abstract: Equilibrium partitioning of hydrophobic (14)C-benzo(a)pyrene and hydrophilic (14)C-benazolin between fractionated phases from an arable topsoil of Merzenhausen (Germany) was investigated. Topsoil samples were collected from lysimeters which were incubated with different residual crops. A physical soil fractionation based on sedimentation and centrifugation steps was performed after water extraction. Four soil phases were obtained designated sediment (SED) phase (>20 microm), microaggregate (MA) phase (2 microm-20 microm), colloid (COL) phase (<2 microm) and electrolyte (EL) phase. The distribution of (14)C-benzo(a)pyrene, (14)C-benazolin and organic carbon between the soil phases was established. Enrichment factors for the two chemicals and organic carbon are higher in the COL and MA phases than in the SED phase. The distribution constant K(d) of chemicals for Merzenhausen topsoil was calculated according to two-phase or three-phase partitioning models. The three-phase partitioning model presumes the contribution of the organic carbon for the binding of chemicals. A log K(oc) of 5.55 can be calculated in the case of (14)C-benzo(a)pyrene, which is typical of the hydrophobic association with the soil organic carbon. In the case of (14)C-benazolin, much higher K(d) and K(oc) values were calculated than found with parent molecules after short-time experiments. Long-term aging processes must be considered. Specific effects on the chemical distribution due to the different crop residues were not detected.

Keyword(s): Adsorption (MeSH) ; Benzo(a)pyrene: chemistry (MeSH) ; Carbon Radioisotopes (MeSH) ; Chemical Fractionation: methods (MeSH) ; Germany (MeSH) ; Imidazoles: chemistry (MeSH) ; Mathematics (MeSH) ; Models, Chemical (MeSH) ; Soil Pollutants: analysis (MeSH) ; Carbon Radioisotopes ; Imidazoles ; Soil Pollutants ; metizoline ; Benzo(a)pyrene ; J ; organic chemicals (auto) ; soil phases (auto) ; equilibrium partitioning models (auto) ; crop residues (auto)

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Agrosphäre (ICG-IV)

Research Program(s):

1. Chemie und Dynamik der Geo-Biosphäre (U01)

Appears in the scientific report 2005

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