title: Development and validation of an SPME-GC method for a degradation kinetics study of propiconazole I, propiconazole II and tebuconazole in blueberries in Concordia, the main production area of Argentina.
abstract: An analytical method for the simultaneous determination of propiconazole isomers and tebuconazole residues in blueberries was developed using solid-phase microextraction (SPME) coupled to gas chromatography. Confirmation was performed by gas chromatography-mass spectrometry in selected-ion monitoring mode. The SPME fibre coating selected was CWX-DVB, and the pH was adjusted to 7 with NaOH. The method is selective with adequate precision and high accuracy and sensitivity. Recoveries ranged between 97.4% and 98.9% for all compounds; and detection and quantification limits were respectively 0.21 and 0.49 μg kg-1for propiconazole I; 0.16 and 0.22 μg kg-1for propiconazole II; and 0.16 and 0.48 μg kg-1for tebuconazole. The degradation of these fungicides in blueberries followed first-order rate kinetics. The half-life times for flowering and fruit set applications were respectively 4.0 and 10.3 days for propiconazole I, 4.0 and 11.4 days for propiconazole II, and 3.5 and 12.4 days for tebuconazole.
authors.affiliation: a Facultad de Ciencias de la Alimentación , Universidad Nacional de Entre Ríos , Concordia , Argentina.
authors.forename: Martín S
authors.initials: MS
authors.lastname: Munitz
authors.affiliation: a Facultad de Ciencias de la Alimentación , Universidad Nacional de Entre Ríos , Concordia , Argentina.
authors.forename: María B
authors.initials: MB
authors.lastname: Medina
authors.affiliation: a Facultad de Ciencias de la Alimentación , Universidad Nacional de Entre Ríos , Concordia , Argentina.
authors.forename: María I T
authors.initials: MIT
authors.lastname: Montti
mesh_terms: D001118:Argentina; D029798:Blueberry Plants / Q000737:chemistry*; D002849:Chromatography, Gas; D005638:Fruit / Q000737:chemistry*; D007700:Kinetics; D010573:Pesticide Residues / Q000032:analysis*; D052617:Solid Phase Microextraction / Q000379:methods* / Q000592:standards*; D014230:Triazoles / Q000032:analysis*
chemical_list: D010573:Pesticide Residues; D014230:Triazoles; C045950:propiconazole; C087114:tebuconazole
keywords: Blueberries; SPME/GC-MS; degradation kinetics; propiconazole tebuconazole