Separation of s-triazine herbicides and their metabolites by capillary zone electrophoresis as a function of pH

The effects of buffer pH on electrophoretic mobility of various s-triazines (chloro-, hydroxy-, methoxy- and thiomethyl- s-triazines) in light of their chemical properties have been studied. Good separation was achieved for each class of s-triazines as cations, except for the chlorotriazines, with b...

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Bibliographic Details
Published in:Journal of Chromatography A 1996-02, Vol.723 (1), p.169-177
Main Authors: Schmitt, Ph, Garrison, A.W., Freitag, D., Kettrup, A.
Format: Article
Language:English
Subjects:
Capillary electrophoresis
Herbicides
s-Triazines
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Summary:The effects of buffer pH on electrophoretic mobility of various s-triazines (chloro-, hydroxy-, methoxy- and thiomethyl- s-triazines) in light of their chemical properties have been studied. Good separation was achieved for each class of s-triazines as cations, except for the chlorotriazines, with buffer pH around the p K a of the herbicides, as well as at a pH of p K a − 2. Migration times were correlated with molecular masses (as a first approximation of molecular size and shape). Possible hydrophobic wall interactions were detected at acidic pH and low voltage. Separation of hydroxytriazine metabolites as anions could also be achieved at a high pH of around 8. The detection level calculated for most of these s-triazines was μg/ml of analyte in the injection solution.
ISSN:0021-9673
DOI:10.1016/0021-9673(95)00805-5