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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

AMADOR-HERNANDEZ, Judith et al. SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF ATRAZINE AND DICAMBA IN WATER BY PARTIAL LEAST SQUARES REGRESSION. J. Chil. Chem. Soc. [online]. 2005, vol.50, n.2, pp.461-464. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072005000200004.

It is presented the development of a new and easy analytical method for the simultaneous determination of atrazine and dicamba in water. Under the experimental conditions proposed, atrazine showed a linear dynamic range of 0.3 to 4.9 µg mL-1, a limit of detection of 0.1 µg mL-1 and a limit of quantification of 0.3 µg mL-1; similarly, dicamba showed a linear dynamic range of 0.8 to 8.8 µg mL-1, a limit of detection of 0.2 µg mL-1 and a limit of quantification of 0.8 µ mL-1. Partial Least Squares Regression (Type 1) was applied for the resolution of spectral interferences between analytes, obtaining recovery percentages higher than 95 % for both compounds in synthetic mixtures. Finally, quantitative determination of both herbicides in tap, well and sea water samples, was carried out successfully by the proposed method, previous preconcentration of the analytes by solid phase extraction

Palavras-chave : Herbicides; atrazine; dicamba; PLS; spectrophotometry.

        · texto em Inglês

 

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