title: Investigations on the sorption of a toxaphene model congener, the B7-1450, on marine sediments.
abstract: Sorption is a natural process that takes place in sediments or soils and changes the mobility and availability of hydrophobic organic compounds, such as toxaphene pesticide in the environment. The sorption of the 2-exo,3-endo,5-exo,8,9,10,10-heptachlorobornane (B7-1450), used as a model compound of the toxaphene heptachlorobornane congeners found in sediments, was investigated for the first time through a series of batch sorption experiments. The losses of B7-1450 due to adsorption onto glass walls and to evaporation occurring during analytical treatment steps were corrected. The study showed that these specific losses ranged from 2% to 3.5% for the glass walls adsorption and can be as high as 15% for the evaporation treatment. The sorption coefficients, K(d) and K(oc), of B7-1450 could be overestimated by >30%, particularly for low-concentration samples, if the losses were not corrected. Loss correction equations were established, validated and applied to determine sorption coefficients for the B7-1450 congener. The K(oc) values for B7-1450 determined over a gradient of concentrations ranged from 3.5x10(4) to 6.5x10(4)mlg(-1), revealing a strong affinity of B7-1450 for marine sediments.
authors.affiliation: Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, Rimouski, QC, Canada G5L 3A1.
authors.forename: Youssouf Djibril
authors.initials: YD
authors.lastname: Soubaneh
authors.forename: Michel
authors.initials: M
authors.lastname: Lebeuf
authors.forename: Bruno
authors.initials: B
authors.lastname: Gouteux
authors.forename: Huixiang
authors.initials: H
authors.lastname: Xie
authors.forename: Vladimir
authors.initials: V
authors.lastname: Nikiforov
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Gagné
mesh_terms: D000327:Adsorption; D001892:Camphanes / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D015394:Molecular Structure; D014112:Toxaphene / Q000737:chemistry*
chemical_list: D001892:Camphanes; C007923:heptachlorobornane; D014112:Toxaphene