Silicone rubber selection for passive sampling of pesticides in water

TALANTA

卷:160

Article

Martin, A.¹  Margoum, C.¹  Randon, J.²  Coquery, M.¹ 

[1] Irstea, UR MALY, 5 Rue Doua,BP32108, F-69616 Villeurbanne, France

[2] Univ Lyon 1, Ens Lyon, Inst Sci Analyt, CNRS,UMR 5280, 5 Rue Doua, F-69100 Villeurbanne, France

关键词: Pesticide;    Silicone rubber;    Partition coefficient;    Passive sampling;    Liquid chromatography;   

DOI  :  10.1016/j.talanta.2016.07.019

来源: Elsevier

【 摘 要 】

Silicone rubber can extract organic compounds with a broad range of polarities (log K-ow > 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 (K-sw). 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 K-sw values of 21 pesticides were determined, filling a gap in the literature (1.50 < log K-ow < 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 K-sw literature values. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free