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Optimization and validation of liquid-liquid extraction with low temperature partitioning for determination of carbamates in water.
Goulart, Simone Machado; Alves, Renata Domingos; Neves, Antônio Augusto; de Queiroz, José Humberto; de Assis, Tamires Condé; de Queiroz, Maria Eliana L R.
Afiliação
  • Goulart SM; Departamento de Química, Universidade Federal de Viçosa, Vila Gianetti, Casa 24, 36 570-000 Viçosa, MG, Brazil.
Anal Chim Acta ; 671(1-2): 41-7, 2010 Jun 25.
Artigo em Inglês | MEDLINE | ID: mdl-20541641
ABSTRACT
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.
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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Carbamatos / Resíduos de Praguicidas / Cromatografia Líquida de Alta Pressão Idioma: Inglês Revista: Anal Chim Acta Ano de publicação: 2010 Tipo de documento: Artigo País de afiliação: Brasil