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Discute-se a importância da exatidao e da precisao na validacao de metodos de analise de residuos de pesticidas. Sao apresentados, mediante dois estudos de casos, os principais processos para a avaliacao da exatidao. Nos casos relatados foram obtidas recuperacoes entre 80 e 104% e coeficiente de variacao entre 2,81 e 12,74%, ambos enquadrados na faixa recomendada pela Association of Official Analytical Chemists (AOAC) para os niveis de concentracao investigados. Os estudos evidenciaram que, os ensaios de recuperacao sao adequados para a avaliacao dos criterios de exatidao e precisao para as mesmas matrizes. EVALUATION OF METHODS ACCURACY AND PRECISION FOR ANALYSIS OF PESTICIDES RESIDUES THROUGH RECUPERATION ASSAYS Abstract The importance of accuracy and precision in the methods validation of pesticides residues analysis is discussed. The main processes for accuracy evaluation are presented through two case studies. In the cited cases, recoveries were obtained between 80 and 104% and variation coefficient between 2,81 and 12,74% both in the range recommended by AOAC for the concentration levels investigated. The studies evidenced that the recovery assays were adequate for the evaluation of the accuracy and precision criteria for the same matrix.

AVALIAÇÃO DA EXATIDÃO E DA PRECISÃO DE MÉTODOS DE ANÁLISE DE RESÍDUOS DE PESTICIDAS MEDIANTE ENSAIOS DE RECUPERAÇÃO