title: Evaluation of the use of performance reference compounds in an Oasis-HLB adsorbent based passive sampler for improving water concentration estimates of polar herbicides in freshwater.
abstract: Passive samplers such as the Polar Organic Chemical Integrative Sampler (POCIS) are useful tools for monitoring trace levels of polar organic chemicals in aquatic environments. The use of performance reference compounds (PRC) spiked into the POCIS adsorbent for in situ calibration may improve the semiquantitative nature of water concentration estimates based on this type of sampler. In this work, deuterium labeled atrazine-desisopropyl (DIA-d5) was chosen as PRC because of its relatively high fugacity from Oasis HLB (the POCIS adsorbent used) and our earlier evidence of its isotropic exchange. In situ calibration of POCIS spiked with DIA-d5 was performed, and the resulting time-weighted average concentration estimates were compared with similar values from an automatic sampler equipped with Oasis HLB cartridges. Before PRC correction, water concentration estimates based on POCIS data sampling rates from a laboratory calibration exposure were systematically lower than the reference concentrations obtained with the automatic sampler. Use of the DIA-d5 PRC data to correct POCIS sampling rates narrowed differences between corresponding values derived from the two methods. Application of PRCs for in situ calibration seems promising for improving POCIS-derived concentration estimates of polar pesticides. However, careful attention must be paid to the minimization of matrix effects when the quantification is performed by HPLC-ESI-MS/MS.
authors.affiliation: Cemagref, UR REBX, 50 Avenue de Verdun, Gazinet, F-33612 Cestas Cedex, France. nicolas.mazzella@cemagref.fr
authors.forename: Nicolas
authors.initials: N
authors.lastname: Mazzella
authors.forename: Sophie
authors.initials: S
authors.lastname: Lissalde
authors.forename: Sylvia
authors.initials: S
authors.lastname: Moreira
authors.forename: François
authors.initials: F
authors.lastname: Delmas
authors.forename: Patrick
authors.initials: P
authors.lastname: Mazellier
authors.forename: James N
authors.initials: JN
authors.lastname: Huckins
mesh_terms: D000327:Adsorption; D001331:Automation; D002851:Chromatography, High Pressure Liquid; D004784:Environmental Monitoring / Q000379:methods; D005618:Fresh Water / Q000032:analysis*; D006540:Herbicides / Q000032:analysis*; D007700:Kinetics; D008962:Models, Theoretical; D009930:Organic Chemicals / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis; D010575:Pesticides / Q000032:analysis; D013048:Specimen Handling / Q000379:methods; D021241:Spectrometry, Mass, Electrospray Ionization; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006540:Herbicides; D009930:Organic Chemicals; D010573:Pesticide Residues; D010575:Pesticides; D014874:Water Pollutants, Chemical