title: Role of cation exchange processes on the sorption influenced transport of cationic β-blockers in aquifer sediments.
abstract: The influence of cation exchange processes on the transport behavior of the cationic β-blockers atenolol and metoprolol was investigated by applying saturated laboratory column experiments. Breakthrough curves using natural sediments under different competitive conditions were generated and resulting sorption coefficients were compared. For the cationic species of atenolol (at pH = 8), the existence and dominating role of cation exchange processes were demonstrated by varying calcium concentrations. No effect of atenolol concentration on its retardation was observed within a wide concentration range. The breakthrough curve comparison of atenolol and the more hydrophobic metoprolol under constant conditions showed a significantly stronger retardation for metoprolol than for atenolol. However, additional non-polar interactions cannot explain the observed differences as they are determined to be negligible for both compounds. Due to the dominating role of cation exchange processes for the cationic species on overall sorption, a simple prediction of β-blocker transport in the subsurface by using K(OC) values derived from log K(OW)-log K(OC) correlations is not feasible.
authors.affiliation: Geoscience Centre, Dept. Applied Geology, University of Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany. Electronic address: Mario.Schaffer@geo.uni-goettingen.de.
authors.forename: Mario
authors.initials: M
authors.lastname: Schaffer
authors.affiliation: Institute of Water Chemistry, Dresden University of Technology, 01062 Dresden, Germany.
authors.forename: Hilmar
authors.initials: H
authors.lastname: Börnick
authors.affiliation: Geoscience Centre, Dept. Applied Geology, University of Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany.
authors.forename: Karsten
authors.initials: K
authors.lastname: Nödler
authors.affiliation: Geoscience Centre, Dept. Applied Geology, University of Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Licha
authors.affiliation: Institute of Water Chemistry, Dresden University of Technology, 01062 Dresden, Germany.
authors.forename: Eckhard
authors.initials: E
authors.lastname: Worch
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000737:chemistry*; D000327:Adsorption; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D060587:Groundwater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000319:Adrenergic beta-Antagonists; D014874:Water Pollutants, Chemical