On-line determination of hexazinone in water by solid phase extractionUV/Vis spectrophotometry

Abstract

In this work, the continuous determination of hexazinone in water was carried out by developing an
online solid phase extraction by flow injection coupled with spectrophotometric detection. Variables
related to hydrodynamic conditions were optimized by a full factorial design 3^2, of which the results
were analyzed through an analysis of variance. Under the proposed optimal conditions, the principal
figures of merit were a working range between 0.50 to 7.00 μg mL-1 of hexazinone; a precision of
4.6% expressed as variance coefficient; a limit of detection of 0.05 μg mL-1, and a limit of
determination of 0.16 μg mL-1. Univariant calibrations based on the height or area of transitorial
signals were compared to identify the best conditions for quantification. Samples of well and sea water
were analyzed, obtaining satisfactory results in all cases in terms of precision and accuracy.