Quantitative Analysis of Prometrine Herbicide by Liquid-Liquid Extraction Procedures Coupled to Electrochemical Measurements

A.V. JUÀREZ; L.M. YUDI

ELECTROANALYSIS

Wiley - VCH

Año: 2009 vol. 21 p. 767 - 771

1040-0397

A sensitive method is proposed for the preconcentration and quantification of the herbicide Prometrine (PROM) at a liquid-liquid interface employing square-wave voltammetry. The preconcentration stage was based on liquid-liquid extraction methodology and the PROM quantification was carried out from the peak current of square-wave voltammograms. Under the experimental conditions employed, linear calibration curves in the concentration range 1.0×10-6 M-5.0×10-5 M, with detection limit equal to 1.5×10-6 M were obtained without pretreatment of the samples. This linear range, as well as detection limit could be extended towards lower concentrations when a pretreatment procedure was employed. In this way, linearity of calibration curves between 8.0×10-8 M and 2.4×10-7 M and detection limit of 1.0×10-7 M, were observed. On the other hand, the standard addition method was also used as an alternative and an appropriated quantification technique for this system. A linear concentration range between 1.0×10-6 M and 2.7×10-5 M, with a correlation coefficient of 0.997, was obtained. This procedure has also a promising application in the separation of herbicides from other interferents, present in real samples, previous to their quantification.