Second-order advantage maintenance with voltammetric data modeling for quantitation of ethiofencarb in presence of interferences

MORA DIEZ; GUIBERTEAU CABANILLAS; SILVA RODRIGUEZ; GOICOECHEA H C

TALANTA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2015

0039-9140

This work presents the development of a method based on a voltammetric determination coupled to second-order data modeling with multivariate curve resolution-alternating least-squares (MCR?ALS) and unfolded partial least squares regression followed of residual biliniarization (U-PLS/RBL) for the quantitation of the pesticide ethiofencarb in presence of interferences in tap water. The determination of ethiofencarb by voltammetry is possible on the basis that this pesticide is hydrolysed in alkaline media given rise to a compound which shows an oxidation peak to Ep = 0.80 V. But some other pesticides belonging to the same family can be considered as interferences due to the high overlapping in their signals. The two interferences are fenobucarb and bendiocarb, which have not been included in the calibration step. The possibility of second order multivariate calibration was study by using the hydrolysis time as the third variable and MCR-ALS and U-PLS/RBL. Good results were obtained in this determination in spite of the high overlapping in voltammetric signals.