Assessment of Dimethoate Residues in Olives at the Time of Harvest and After Brine Using QuEChERS Extraction
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Pesticides are among the most investigated priority pollutants in agricultural products due to their widespread use and toxicity. The olive fruit fly (Bactrocera oleae) is one of the main pests of the olive tree in Portugal, and for an effective protection against this plague, farmers rely mostly on the use of insecticides. Six olive samples were collected in four olive groves to evaluate the presence of residues of dimethoate used for the combat of olive fruit fly, in table olives at the time of harvest and after brine. QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) extraction was optimized, one factor at a time, applied to the olive samples, and the extracts were analysed using liquid chromatography–diode array detection. Positive results were obtained in two samples at the time of harvest (3.58 and 4.34 mg/kg fw). One olive grove was selected to test two concentrations of salt and assess their influence on the quantity of residues. After brine, dimethoate residues were not detected.
KeywordsDimethoate Table olives QuEChERS Liquid chromatography
Compliance with Ethical Standards
This work received financial support from the European Union (FEDER funds through COMPETE) and National Funds (FCT, Fundação para a Ciência e Tecnologia) through project UID/QUI/50006/2013.
Conflict of Interest
Paula Paíga declares that she has no conflict of interest. Carla Meneses declares that she has no conflict of interest. David H. Lopes declares that he has no conflict of interest. Manuela Correia declares that she has no conflict of interest. Cristina Delerue-Matos declares that she has no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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