title: Silicone rubber selection for passive sampling of pesticides in water.
abstract: Silicone rubber can extract organic compounds with a broad range of polarities (logKow>2-3) from aqueous samples. Such compounds include substances of major concern in the protection of aquatic ecosystems and human health, e.g. pesticides. Silicone rubbers (SRs) with various characteristics have been successfully used in sorptive methods for water sample extraction in the laboratory (SPME, SBSE), and for passive sampling in aquatic environments. However, only few studies have evaluated variability in organic compound sorption due to the origin of SRs, particularly for pesticides. The aim of this study was to select an SR for the extraction of pesticides from water samples by passive sampling. To this end we measured the impact of seven SR formulations on sorption capacity, defined by the partition coefficient (Ksw). Kinetic experiments and sorption isotherms were performed to determine extraction recovery as a selection criterion for SRs, and pesticide partition coefficients. Very large differences in affinity for pesticides were found between two kinds of SRs: "Polymerized SR kits" and "Manufactured SRs". One SR was chosen among the "Manufactured SRs", and the Ksw values of 21 pesticides were determined, filling a gap in the literature (1.50<logKow<5.51). In light of sorption properties, literature data and additional economic and technical factors, we suggest using SR from Goodfellow in future work to reduce the variability of Ksw literature values.
authors: Irstea, UR MALY, 5 rue de la Doua, BP32108, Villeurbanne Cedex, F-69616, France.
authors: A
authors: A
authors: Martin
authors: Irstea, UR MALY, 5 rue de la Doua, BP32108, Villeurbanne Cedex, F-69616, France. Electronic address: christelle.margoum@irstea.fr.
authors: C
authors: C
authors: Margoum
authors: Univ Lyon, CNRS, Université Claude Bernard Lyon 1, Ens de Lyon, Institut des Sciences Analytiques, UMR 5280, 5 rue de la Doua, Villeurbanne, F-69100 France.
authors: J
authors: J
authors: Randon
authors: Irstea, UR MALY, 5 rue de la Doua, BP32108, Villeurbanne Cedex, F-69616, France.
authors: M
authors: M
authors: Coquery
mesh_terms: D020003:1-Octanol / Q000737:chemistry; D000327:Adsorption; D010575:Pesticides / Q000032:analysis* / Q000737:chemistry; D012826:Silicone Elastomers / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D010575:Pesticides; D012826:Silicone Elastomers; D014867:Water; D020003:1-Octanol
keywords: Liquid chromatography; Partition coefficient; Passive sampling; Pesticide; Silicone rubber