Development and validation of a multi-residue analytical methodology to determine the presence of selected pesticides in water through liquid chromatography

• Autor(es):

  Brondi, Silvia H. G. (Universidade de São Paulo. Instituto de Química de São Carlos);

  Lanças, Fernando M. (Universidade de São Paulo. Instituto de Química de São Carlos).

• Fonte:

  Journal of the Brazilian Chemical Society; volume 16, número 3b, páginas 650-653. Junho 2005.

• Assuntos:

  pesticides;

  water;

  extraction;

  chromatography.

• Resumo:

  In the present work an analytical methodology is described to determine the presence of multi-residues of selected pesticides used in sugar-cane cultures (tebuthiuron, hexazinone, diuron, 2,4-D and ametrine), in source of drinking water. The analytes were isolated from the water matrix through the following techniques: liquid-liquid extraction (LLE) using dichloromethane as solvent; solid phase extraction (SPE) using C18 as solid support and acetonitrile as solvent to condition the solid phase and elution of the analytes; and supercritical fluid extraction (SFE) using C18 as solid support and CO2 in supercritical state as extractant solvent. The chromatographic analysis was done by high performance liquid chromatography (HPLC) with an ultraviolet detector and using acetonitrile/water as mobile phase. Among the three evaluated extraction techniques, the best results were obtained with both liquid-liquid extraction and solid phase extraction.

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