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Ambient mass spectrometry: Direct analysis of dimethoate, tebuconazole, and trifloxystrobin on olive and vine leaves by desorption electrospray ionization interface
Author(s) -
Mainero Rocca Lucia,
Cecca Juri,
L'Episcopo Nunziata,
Fabrizi Giovanni
Publication year - 2017
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.3978
Subject(s) - chemistry , desorption electrospray ionization , dimethoate , electrospray ionization , tebuconazole , electrospray , mass spectrometry , chromatography , analytical chemistry (journal) , extractive electrospray ionization , ambient ionization , desorption , ionization , electron ionization , chemical ionization , pesticide , sample preparation in mass spectrometry , ion , organic chemistry , adsorption , agronomy , biology
Abstract A new field of application for a relatively new mass‐spectrometric interface such as desorption electrospray ionization was evaluated. For this purpose, its behavior was tested versus quantitative analysis of dimethoate, trifloxystrobin, and tebuconazole directly on olive and vine leaves surface. The goal was workers exposure assessment during field re‐entry operations since evidence suggests an association between chronic occupational exposure to some agrochemicals and severe adverse effects. Desorption electrospray ionization gave good response working in positive ionization mode, while numerous test were necessary for the choice of a unique blend of spray solvents suitable for all 3 substances. The best compromise, in terms of signal to noise ratios, was obtained with the CH 3 OH/H 2 O (80:20) mixture. The obvious difficulties related to the impossibility to use the internal standard were overcome through an accurate validation. Limits of detection and quantitation, dynamic ranges, matrix effects, and intraday precisions were calculated, and a small monitoring campaign was arranged to test method applicability and to evaluate potential dermal exposure. This protocol was developed in work safety field, but after a brief investigation, it was find to be suitable also for food residue evaluation.