Abstract
Analysis of diquat, paraquat and difenzoquat in water is performed using solid-phase extraction (SPE) on silica cartridges followed by high-performance liquid chromatographic (HPLC) analysis with a normal-phase column. UV detection with variable wavelength was used to determine each compound at its maximum of absorption providing an excellent sensitivity. Recoveries of these herbicides extracted from 1 1 of drinking water spiked at levels between 0.1 and 25 μg/l were higher than 85%. The limits of detection were under 0.1 μg/l. The effect that the presence of organic matter and surfactants in natural waters has on the extraction procedure was studied. Both, surfactants and organic matter (as humic material), show a negative effect on the recoveries of the herbicides and so their content in natural waters must be controlled.
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