Development of multiresidue method for the determination of pesticides in wine by gas chromatography-mass spectrometry

Pelajić, Maja (2016) Development of multiresidue method for the determination of pesticides in wine by gas chromatography-mass spectrometry. Doctoral thesis, Faculty of Science > Department of Chemistry.

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Abstract

A new multiresidue method was developed for determination of 25 pesticides in wines by gas chromatography – mass spectrometry. Two sample preparation procedures were optimized; solid phase extraction using OASIS HLB and QuEChERS procedure, where salt concentrations were optimised in order to adjust the distribution of pesticides between two immiscible phases. Method validation, including uncertainty estimation (<50 % for most pesticides), was performed independently for red and white wine as two different matrices and for each sample preparation procedure. Limits of quantification were between 0,01 μg L-1 and 250 μg L-1. The recoveries of most pesticides were between 70 % and 120 % with relative standard deviations <20 %. The matrix effect was investigated and the quality of sample preparation procedures has been evaluated in terms of extraction efficiency. The proposed analytical procedures were applied to 63 Croatian wine samples of different varieties in order to provide the first insight into pesticide residue concentrations in Croatian wines.

Item Type: Thesis (Doctoral thesis)
Keywords: gas chromatography-mass spectrometry, pesticides, QuEChERS, solid phase extraction, wines
Supervisor: Vitali Čepo, Dubravka
Date: 2016
Number of Pages: 203
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Faculty of Science > Department of Chemistry
Depositing User: Branka Maravic
Date Deposited: 01 Jun 2016 08:41
Last Modified: 01 Jun 2016 08:41
URI: http://digre.pmf.unizg.hr/id/eprint/4879

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