title: Sorption behaviors of a persistent toxaphene congener on marine sediments under different physicochemical conditions.
abstract: Sorptive processes are important parameters affecting the mobility, availability and fate of persistent organic pollutants (POPs), such as toxaphene, in aquatic systems. The sorption and desorption behaviors of the B7-1450, a stable toxaphene congener in environment, on marine sediment was studied under different temperature and salinity conditions to better understand the B-1450 distribution in estuarine systems. The data were fitted to different sorption models to characterize sorption behaviors by evaluating sorption coefficients and sequestrated fraction of B7-1450 on sediments. High carbon-normalized sorption coefficients (Koc) of the B7-1450 were observed with values ranging from 3.2×104 to 6.0×104 mL g(-1) under experimental conditions. The data showed an increase of B7-1450 sorption coefficients with the salinity and a decrease with temperature. These investigations indicate that B7-1450 is three times more sequestred on sediments in cold (2°C, 30 psu) than in warm marine conditions (20°C, 30 psu). These results suggest that the mobility and bioavailable of B7-1450 or other POPs from the sediments could be less important in cold marine comparatively in warm marine and warm freshwater media. As a result of climate changes, the warming of mid and high latitudes coastal waters could enhance the mobility of POPs.
authors.affiliation: Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, 310, Allée des Ursulines, Rimouski, QC G5L 3A1, Canada. Electronic address: Youssoufdjibril_Soubaneh@uqar.ca.
authors.forename: Youssouf Djibril
authors.initials: YD
authors.lastname: Soubaneh
authors.affiliation: Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, 310, Allée des Ursulines, Rimouski, QC G5L 3A1, Canada.
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Gagné
authors.affiliation: Department of Fisheries and Oceans, Maurice Lamontagne Institute, P.O. Box 1000, 850 Route de la Mer, Mont-Joli, QC G5H 3Z4, Canada.
authors.forename: Michel
authors.initials: M
authors.lastname: Lebeuf
authors.affiliation: Aquatic Ecosystem Protection Research Division, Environment Canada, Burlington, ON L7R 4A6, Canada.
authors.forename: Bruno
authors.initials: B
authors.lastname: Gouteux
authors.affiliation: Saint-Petersburg Scientific Research Centre for Ecological Safety, Russian Academy of Sciences, Korpusnaya, 18, St. Petersburg 197110, Russia.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Nikiforov
authors.affiliation: Laboratoire de Chimie, Institut des Sciences de la Terre, Centre d'Etude et de Recherche de Djibouti (CERD), Route de l'aéroport, B.P. 486, Republic of Djibouti.
authors.forename: Mohamed Osman
authors.initials: MO
authors.lastname: Awaleh
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry; D019015:Geologic Sediments / Q000032:analysis*; D007306:Insecticides / Q000302:isolation & purification*; D054712:Salinity; D013696:Temperature; D014112:Toxaphene / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D007306:Insecticides; D014874:Water Pollutants, Chemical; D002244:Carbon; D014112:Toxaphene
keywords: Desorption–sequestration; Estuarine sediment; POPs; Salting out; Sorption coefficient; Temperature effect