title: Air-assisted liquid-liquid microextraction-gas chromatography-flame ionisation detection: a fast and simple method for the assessment of triazole pesticides residues in surface water, cucumber, tomato and grape juices samples.
abstract: A recently reported microextraction technique namely air-assisted liquid-liquid microextraction (AALLME) has been described for the extraction/preconcentration of some triazole pesticides from different samples prior to gas chromatography-flame ionisation detection (GC-FID). This technique is similar to dispersive liquid-liquid microextraction (DLLME) but in this method there is no need to use a disperser solvent and also volume of the used extraction solvent is less than DLLME. In this study, toluene with a density lower than that of water was used as an extraction solvent. Under the optimum extraction conditions, the method showed wide linear ranges with R(2)>0.996 and low limits of detection and quantification between 0.53-1.13 and 1.76-3.77 ng mL(-1), respectively. Enrichment factors (EFs) and extraction recoveries (ERs) were in the ranges of 713-808 and 100-113%, respectively. Relative standard deviations (RSDs) for the extraction of 25 and 250 ng mL(-1) of each selected triazole pesticide were less than 7% for intra-day (n=6) and inter-days (n=5) precision. The method was successfully used for analytes determination in different surface water, grape juice, cucumber, and tomato samples.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran. Electronic address: mafarajzadeh@yahoo.com.
authors.forename: Mir Ali
authors.initials: MA
authors.lastname: Farajzadeh
authors.forename: Leila
authors.initials: L
authors.lastname: Khoshmaram
mesh_terms: D001628:Beverages / Q000032:analysis*; D002849:Chromatography, Gas / Q000295:instrumentation / Q000379:methods; D018553:Cucumis sativus / Q000737:chemistry*; D005506:Food Contamination / Q000032:analysis; D059627:Liquid Phase Microextraction / Q000379:methods*; D018551:Solanum lycopersicum / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis / Q000302:isolation & purification*; D014230:Triazoles / Q000032:analysis* / Q000302:isolation & purification*; D027843:Vitis / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*
chemical_list: D010573:Pesticide Residues; D014230:Triazoles; D014874:Water Pollutants, Chemical
keywords: AALLME; GC-FID; Grape juices; Surface water; Triazole pesticides