Extração sólido-líquido com partição a baixa temperatura e seu emprego na análise multirresíduos de agrotóxicos em uva e derivados

• Autor(a) principal: Soares, Carlos Eduardo dos Santos
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2101
• topic: Extração sólido-líquido; Análise multirresíduo; Cromatografia gasosa; Uva; Solid-liquid extraction; Multiresidue analysis; Gas chromatography; Grape; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA

The objectives of this work were to optimize and validate the solid-liquid extraction technique with partition at low temperature (ESL-PBT) for multiresidue analysis of samples of grapes by gas chromatography with electron capture detector (GC-ECD). During the optimization procedure of solid-liquid extraction technique with partition at low temperature, factors that influence the percent recovery of pesticides, and provide ideal conditions for analysis, were evaluated. The method was validated by determination of the selectivity, linearity of response and the method, limit of detection, limit of quantification, accuracy and precision. The results showed that the ESL-PBT technique is effective for analysis of pesticides in grapes. The detection limits (0.0006 to 0.0150 mg kg-1) and quantification (0.0020 to 0.0495 mg kg-1) Found were lower than the maximum residue limits (MRL) established by legislation. The optimized and validated technique was applied to samples of grapes and grape juice industrialized, and contamination was found in two of the eleven samples of grapes and in six of nine industrialized juice samples. Furthermore, the influence of the components of the grape in the quantification of pesticides by gas chromatography was studied, employing the method of superposition of the matrix (matrix-matched). The results showed that co-extractives of the matrix affect significantly the quantification of pesticides in the study and that for each compound there was a distinct behavior in relation to such effect.