title: Multiresidue determination of pesticides in drinking and related waters by solid-phase extraction and liquid chromatography with ultraviolet detection: interlaboratory study.
abstract: As part of a project funded by the European Commission (EC) for the development and evaluation of multiresidue methods for analysis of drinking and related waters, 17 European laboratories evaluated a method using styrene-divinylbenzene copolymer solid-phase extraction followed by liquid chromatography with diode array detection. The main aim of the study was to evaluate whether the method meets the requirements of EC Drinking Water Directive 98/83 in terms of accuracy, precision, and detection limit for 21 pesticides according to the following requirements: limit of detection, < or =0.025 microg/L; accuracy expressed as recovery, between 75 and 125%; and precision expressed as repeatability relative standard deviation of the method, <12.5%, and as reproducibility relative standard deviation of the method, <25%. Analyses for unknown concentrations were performed with commercial bottled and tap waters. All laboratories were able to achieve detection limits of 0.01 microg/L for all pesticides except pirimicarb (0.02 microg/L). The criteria for repeatability were met for all compounds. Terbutryn in bottled water and carbendazim in tap water did not meet the criteria for reproducibility. In terms of accuracy, the method met the requirements for all pesticides in both matrixes, except for metamitron. However, several compounds (linuron, terbutryn, propazine, metobromuron, and isoproturon) showed recoveries slightly below 75%.
authors: Study Center for Water, Antwerp, Belgium. fvanhoof@aww.be
authors: François
authors: F
authors: Van Hoof
authors: Peter
authors: P
authors: Van Wiele
authors: Franvoise
authors: F
authors: Acobas
authors: Jean-Luc
authors: JL
authors: Guinamant
authors: Auguste
authors: A
authors: Bruchet
authors: Isabelle
authors: I
authors: Schmitz
authors: Ivana
authors: I
authors: Bobeldijk
authors: Frank
authors: F
authors: Sacher
authors: Francesc
authors: F
authors: Ventura
authors: Rosa
authors: R
authors: Boleda
mesh_terms: D002853:Chromatography, Liquid; D010573:Pesticide Residues / Q000032:analysis*; D014466:Ultraviolet Rays; D014867:Water / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
chemical_list: D010573:Pesticide Residues; D014867:Water