Published: Journal of Chromatographic Science, Volume 37, Number 3, March 1999, pp. 71-76.
High-Performance Liquid Chromatography Column Switching Applied
to the Trace Determination of Herbicides in Environmental and Drinking Water
Samples
Livia Nemeth Konda, Maria Begona Barroso, György Morovján, and
Peter Csokan
A selective and sensitive coupled-column high-performance liquid chromatographic method is developed for the simultaneous determination of 5 phenylurea herbicides (monuron, linuron, isoproturon, monolinuron, and diuron) in environmental and drinking water samples. Sample clean-up is performed automatically by means of a column switching technique. Using 2 octadecyl silica columns connected via two programmable 6-port valves and ultraviolet detection at 244 nm, the aforementioned compounds can be determined at the low concentration levels required for pesticide residue analysis in water samples. A mobile phase consisting of a mixture of methanol–water (55:45, v/v) is pumped at 1 mL/min. For the 5 phenylureas, high recoveries ranging from 94.9 to 101.6%, good reproducibility with relative standard deviations lower than 5%, and wide linear ranges up to 20 µg/L are observed with determination limits of 0.05 µg/L. The method is successfully applied to the screening of different environmental water samples such as surface, ground, rain, and drinking water.
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