Design of advanced flow systems with zone merging and zone trapping hyphenated to dynamic leaching tests for the determination of triazine herbicides in samples of agronomical relevance

Abstract

Analytical procedures relying on slow chemical reactions will be implemented as in-line post-column detection of dynamic column-based bioaccessibility tests using multi-syringe flow injection or sequential injection systems. For improving sensitivity and/or selectivity and lessening the reagent consumption, thus waste generation, different approaches such as zone merging, zone trapping, flow programming, and in-line solid phase extraction will be critically investigated. To this end, commuting facilities and monolithic mini-columns will be exploited. Moreover, a novel strategy for heating in flow analysis will be implemented. As application, the simultaneous spectrophotometric determination of atrazine and ametryn in sediment extracts was selected. After system design and dimensioning, the main analytical figures of merit will be evaluated, and the proposed procedure will be applied to large-scale analysis. (AU)