Authors: Emiliane Andrade Araújo Marcelo César Rosa Lara Marcelo Rodrigues dos Reis Rodolfo Lázaro Soares Viriato Renata Abadia Reis Rocha Rosembergue Gabriel Lima Gonçalves Fernanda Fernandes Heleno Maria Eliana Lopes Ribeiro de Queiroz Jairo Tronto Frederico Garcia Pinto
Publish Date: 2015/09/23
Volume: 9, Issue: 5, Pages: 1344-1352
Abstract
This study aimed to optimize and validate an analytical method for extraction detection and quantification of haloxyfopmethyl procymidone and linuron pesticides in carrot samples using solid–liquid extraction methods and low temperature partition SLELTP accompanied by gas chromatography coupled to mass spectrometry GCMS For SLELTP technical optimization we utilized a complete factorial planning which had as its variables agitation time freezing time and the correct sample mass/extracting solution volume ratio The organic extract obtained was analyzed by GCMS To test the performance of this procedure the method was validated and applied to the monitoring of pesticide residues in 20 samples of carrot produced in Alto Paranaíba Minas Gerais Brazil The proposed method showed linearity between 05 and 35 mg·kg−1 with correlation coefficients greater than 099 The quantification limits were 048 mg·kg−1 for haloxyfopmethyl 069 mg·kg−1 for linuron and 065 mg·kg−1 for procymidone values below the maximum residue limit provided by international legislation of 10 mg·kg−1 for linuron and procymidone The use of haloxyfopmethyl is not approved in the cultivation of carrot The recovery percentages were between 90 and 110 with a coefficient of variation of less than 12 Ten percent of the carrot samples monitored showed residues of linuron and procymidone in concentrations exceeding those permitted by Brazilian law
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