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Anal Chim Acta ; 671(1-2): 41-7, 2010 Jun 25.
Artigo em Inglês | MEDLINE | ID: mdl-20541641


Using a 2(3) experimental design, liquid-liquid extraction with low temperature partitioning (LLE-LTP) was optimized and validated for analysis of three carbamates (aldicarb, carbofuran and carbaryl) in water samples. In this method, 2.0 mL of sample is placed in contact with 4.0 mL of acetonitrile. After agitation, the sample is placed in a freezer for 3 h for phase separation. The organic extract is analyzed by high performance liquid chromatography with ultraviolet detection (HPLC-UV). For validation of the technique, the following figures of merit were evaluated: accuracy, precision, detection and quantification limits, linearity, sensibility and selectivity. Extraction recovery percentages of the carbamates aldicarb, carbofuran and carbaryl were 90%, 95% and 96%, respectively. Even though extremely low volumes of sample and solvent were used, the extraction method was selective and the detection and quantification limits were between 5.0 and 10.0 microg L(-1), and 17.0 and 33.0 microg L(-1), respectively.

Carbamatos , Cromatografia Líquida de Alta Pressão/métodos , Resíduos de Praguicidas , Poluentes Químicos da Água , Aldicarb/análise , Carbamatos/análise , Carbaril/análise , Carbofurano/análise , Fracionamento Químico/métodos , Limite de Detecção , Resíduos de Praguicidas/análise , Poluentes Químicos da Água/análise