Rodrigues, Sherol AcostaBarbosa, Sergiane CaldasFurlong, Eliana BadialePrimel, Ednei GilbertoZanella, Renato2014-02-222014-02-222011RODRIGUES, Sherol Acosta. et al. Otimização e validação de método empregando quechers modificado e lc-esi-ms/ms para determinação de agrotóxicos em cebola. Quimica Nova, v. 34, n. 5, p. 780-786, 2011. Disponível em: <http://quimicanova.sbq.org.br/qn/qnol/2011/vol34n5/09-AR10368.pdf>. Acesso em: 12 fev. 2014.0100-4042http://repositorio.furg.br/handle/1/4379An evaluation of the pesticides extraction from onion using a modern sample preparation method (QuEChERS) and determination by liquid chromatography tandem mass spectrometry was carried out. All the calibration curves showed r>0.99. The recoveries ranged between 61.8 and 120.0% with relative standard deviation lower than 20% for all compounds. Due to the occurrence of matrix effect, the quantification was performed using matrix-matched calibration. The limits of quantification of the method were between 0.0005 and 0.05 mg kg-1. The method shows the advantages of not require the clean-up step and consume low volume of organic solvents, decreasing time, costs and residues.poropen accesspesticidesQuEChERSLC-ESI-MS/MSarticle