title: Determination of pesticides in surface and ground waters by liquid chromatography-electrospray-tandem mass spectrometry.
abstract: The sensitive multiresidual analytical method for simultaneous analysis of 14 most commonly used agricultural pesticides in Serbia was developed and optimized. The selected insecticides, fungicides and herbicides belong to seven chemical classes (organophosphates, neonicotinoids, carbamates, diacylhydrazines, benzimidazoles, triazines and phenylureas). The method was based on solid-phase extraction followed by liquid chromatography-tandem mass spectrometry. The following parameters that may affect the SPE procedure efficiency were optimized: the sorbent type in combination with different elution solvents, the sample pH and the sample volume. For each pesticide, MS(n) analysis was performed and distinctive ions and transitions were selected for identification and quantification, as well as for confirmation purposes. External matrix-matched calibration method was used to eliminate variable matrix effect and ensure precise quantification. Good recoveries (72-129%), and low limits of detection (0.4-5.5 ng L(-1)) and quantification (1.1-18.2 ng L(-1)) were achieved for all selected pesticides. The developed and optimized method was successfully applied in the analysis of several river waters, as well as ground waters in Serbia, influenced by agriculture. The most frequently detected pesticide was carbendazim. Dimethoate, carbofuran and propazine were also found in the investigated samples.
authors.affiliation: Department of Analytical Chemistry, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia. ndujakovic@tmf.bg.ac.rs
authors.forename: Nikolina
authors.initials: N
authors.lastname: Dujaković
authors.forename: Svetlana
authors.initials: S
authors.lastname: Grujić
authors.forename: Marina
authors.initials: M
authors.lastname: Radisić
authors.forename: Tatjana
authors.initials: T
authors.lastname: Vasiljević
authors.forename: Mila
authors.initials: M
authors.lastname: Lausević
mesh_terms: D001562:Benzimidazoles / Q000032:analysis / Q000302:isolation & purification; D002219:Carbamates / Q000032:analysis / Q000302:isolation & purification; D002235:Carbofuran / Q000032:analysis / Q000302:isolation & purification; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004117:Dimethoate / Q000032:analysis / Q000302:isolation & purification; D005618:Fresh Water / Q000032:analysis*; D010575:Pesticides / Q000032:analysis* / Q000302:isolation & purification; D052616:Solid Phase Extraction; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D014227:Triazines / Q000032:analysis / Q000302:isolation & purification; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D001562:Benzimidazoles; D002219:Carbamates; D010575:Pesticides; D014227:Triazines; D014874:Water Pollutants, Chemical; C006698:carbendazim; D002235:Carbofuran; C100043:propazine; D004117:Dimethoate