title: Effect of structural composition of humic acids on the sorption of a branched nonylphenol isomer.
abstract: By using dialysis equilibrium experiments, the sorption of a branched nonylphenol isomer [4-(1-ethyl-1,3-dimethylpentyl)-phenol] (NP111) on various humic acids (HAs) isolated from river sediments and two reference HAs was studied. The HAs were characterized by solid-state (13)C direct polarization/magic angle spinning nuclear magnetic resonance ((13)C DP/MAS NMR) spectroscopy. Sorption isotherms of NP111 on HAs were described by a linear model. The organic carbon-normalized sorption coefficient (K(OC)) ranged from 2.3×10(3) to 1.5×10(4)Lkg(-1). Interestingly, a clear correlation between K(OC) value and alkyl C content was observed, indicating that the aliphaticity of HAs markedly dominates the sorption of NP111. These new mechanistic insights about the NP111 sorption indicate that the fate of nonylphenols in soil or sediment depends not only on the content of HA, but also on its structural composition.
authors.affiliation: Institute Agrosphere, Institute of Bio- and Geosciences (IBG-3), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
authors.forename: Chengliang
authors.initials: C
authors.lastname: Li
authors.forename: Anne E
authors.initials: AE
authors.lastname: Berns
authors.forename: Andreas
authors.initials: A
authors.lastname: Schäffer
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Séquaris
authors.forename: Harry
authors.initials: H
authors.lastname: Vereecken
authors.forename: Rong
authors.initials: R
authors.lastname: Ji
authors.forename: Erwin
authors.initials: E
authors.lastname: Klumpp
mesh_terms: D000327:Adsorption; D019015:Geologic Sediments / Q000737:chemistry; D006812:Humic Substances; D007536:Isomerism; D016014:Linear Models; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D006812:Humic Substances; D010636:Phenols; D014874:Water Pollutants, Chemical; C025256:nonylphenol