Abstract
The determination of selected pesticides, atrazine, simazine, carbaryl, propanil, linuron and fenamiphos, was carried out in freeze-dried water using automated on-line solid-phase extraction (Prospekt) followed by liquid chromatography with diode-array detection. The concentration of the pesticides in the water varied from 1.2 to 20.5 μg/l after reconstitution of the freeze-dried water sample. A stability study was undertaken using freeze-dried water for a period of 1.5 months at three different storage temperatures (4, −20 and 20°C). It was shown that the degradation of fenamiphos, linuron and simazine observed at 4 and 20°C was correlated with various parameters such as Henry's law constant, hydrolysis, photolysis and temperature.
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