Silicone rubber selection for passive sampling of pesticides in water

Sélection d'élastomères de silicone pour l'échantillonnage passif de pesticides dans l'eau

Martin, A. ; Margoum, C. ; Randon, J. ; Coquery, M.

Type de document
Article de revue scientifique à comité de lecture
Langue
Anglais
Affiliation de l'auteur
IRSTEA LYON UR MALY FRA ; IRSTEA LYON UR MALY FRA ; UNIVERSITE DE LYON UMR 5280 INSTITUT DES SCIENCES ANALYTIQUES VILLEURBANNE FRA ; IRSTEA LYON UR MALY FRA
Année
2016
Résumé / Abstract
Silicone rubber can extract organic compounds with a broad range of polarities (log Kow > 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 < log Kow < 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.
Source
Talanta, vol. 160, p. 306 - 313

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