title: Use of passive stir bar sorptive extraction as a simple integrative sampling technique of pesticides in freshwaters: determination of sampling rates and lag-phases.
abstract: Passive sampling represents a cost-effective approach and is more representative than grab sampling for the determination of contaminant concentrations in freshwaters. In this study, we performed the calibration of a promising tool, the passive stir bar sorptive extraction (SBSE), which has previously shown good performances for semi-quantitative monitoring of pesticides in a field study. We determined the sampling rates and lag-phases of 18 moderately hydrophobic to hydrophobic agricultural pesticides (2.18<log Kow<5.11) from different chemical classes including triazines, substituted ureas, triazoles and organophosphate compounds. We also realised an elimination experiment to identify a performance reference compound (PRC). A flow-through calibration experiment was realised for 7 days at constant concentrations of target pesticides in tap water, under controlled temperature (20 °C) and flow velocity (2.5 cm s(-1)). Sampling rates were between 1.3 and 121 mL d(-1) with satisfactory RSD for most pesticides (9-47%), and poor repeatability for 3 hydrophobic pesticides (59-83%). Lag-phases for all target pesticides were shorter than 2 h, demonstrating the efficiency of passive SBSE for the integration of transient concentration peaks of these contaminants in surface waters. The role of flow velocity on pesticide uptakes was investigated and we assumed a water boundary layer-controlled mass transfer for 5 pesticides with log Kow>3.3. Among these pesticides, we selected fenitrothion to evaluate its elimination, along with its deuterated analogue. Results showed 82% elimination of both compounds over the 7-day experiment and isotropic exchange for fenitrothion, making fenitrothion-d6 a promising PRC candidate for in situ applications.
authors: Irstea, UR MALY, 5 rue de la Doua, CS70077, F-69626 Villeurbanne Cedex, France. Electronic address: azziz.assoumani@irstea.fr.
authors: Azziz
authors: A
authors: Assoumani
authors: Irstea, UR MALY, 5 rue de la Doua, CS70077, F-69626 Villeurbanne Cedex, France.
authors: Christelle
authors: C
authors: Margoum
authors: Irstea, UR MALY, 5 rue de la Doua, CS70077, F-69626 Villeurbanne Cedex, France.
authors: Sophie
authors: S
authors: Chataing
authors: Irstea, UR MALY, 5 rue de la Doua, CS70077, F-69626 Villeurbanne Cedex, France.
authors: Céline
authors: C
authors: Guillemain
authors: Irstea, UR MALY, 5 rue de la Doua, CS70077, F-69626 Villeurbanne Cedex, France.
authors: Marina
authors: M
authors: Coquery
mesh_terms: D002853:Chromatography, Liquid; D004784:Environmental Monitoring / Q000379:methods*; D005618:Fresh Water / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis* / Q000302:isolation & purification; D053719:Tandem Mass Spectrometry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D010575:Pesticides; D014874:Water Pollutants, Chemical
keywords: Agricultural pesticides; Calibration; Passive sampling; Performance reference compound (PRC); Stir bar sorptive extraction (SBSE)