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Stereoselective analysis of acid herbicides in natural waters by capillary electrophoresis
C M Polcaro1, C Marra, C Desiderio
1Istituto di Cromatografia, CNR, Area della Ricerca di Roma Monterotondo Scalo, Rome, Italy. cpolcaro@nserv.icmat.mlib.cnr.it
Abstract:
A capillary electrophoretic method for the stereoselective analysis of aryloxypropionic and aryloxyphenoxypropionic acidic herbicides in ground water and river water was performed. Vancomycin and gamma-cyclodextrin were added to the background electrolyte (BGE) as chiral selectors. Water sample preconcentration was accomplished by solid-phase extraction on styrene-divinylbenzene packed cartridges (2 L of ground water and 1 L of river water). The analytical method allowed for the resolution of mecoprop, fenoprop, fluazifop and haloxyfop racemic mixtures in natural water samples spiked with enantiomer concentration levels in the range 0.1-0.13 ppb for ground water and 0.4-0.54 ppb for river water.