Adsorptive stripping square wave voltammetry (Ad-SSWV) accomplished with second-order multivariate calibration determination of fenitrothion and its metabolites in river water samples.
A method, using stripping square wave voltammetry (Ad-SSWV), for the simultaneous determination of fenitrothion (FEN) and its metabolites: fenitrooxon (OXON) and 3-methyl-4-nitrophenol (3-MET) in environmental samples is reported. All three compounds produce, at mercury electrode (HMDE), an electrochemical signal due to an adsorptive-reductive process. The electrochemical approach shows a very high overlap degree for FEN and OXON voltammograms, however the adsorption kinetic profile could be used as an additional differential variable between both analytes. Second-order multivariate calibration has been tested to solve the mixture of the three compounds. The second-order assayed methods were parallel factor analysis (PARAFAC), unfolded partial least squares (U-PLS), multidimensional partial least squares (N-PLS) and the latest ones were used in combination with the residual bilinearization procedure RBL. U-PLS/RBL model was stated as the best second-order algorithm for the simultaneous determination of these three compounds up to 50 ng mL(-1) for each analyte. The detection limits and recovery values were 1.6 ng mL(-1) and 92+/-7% for FEN; 3.7 ng mL(-1) and 101+/-9% for OXON and 0.6 ng mL(-1) and 97+/-8% for 3-MET.
Department of Analytical Chemistry, University of Extremadura, 06071 Badajoz, Spain. tgaleano@unex.es
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Galeano-Díaz
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Guiberteau-Cabanillas
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Espinosa-Mansilla
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López-Soto
D000327:Adsorption; D002138:Calibration; D003408:Cresols / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D004563:Electrochemistry; D004566:Electrodes; D005278:Fenitrothion / Q000031:analogs & derivatives* / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism*; D008628:Mercury / Q000737:chemistry; D015999:Multivariate Analysis; D045483:Rivers / Q000737:chemistry*
D003408:Cresols; C007711:fenitrooxone; C008636:4-nitro-3-cresol; D008628:Mercury; D005278:Fenitrothion