Abstract
An HPLC procedure for determining phenylurea herbicides in waters is described. A LichroSpher RP select B octadecyl-silane analytical column and spectrophotometric detection at 247 nm were used. Adequate retention was achieved with a mobile phase containing ACN/H2O 35/55 (v/v) and 10−2 M phosphate (pH = 7). The herbicides were isolated from water samples by using a single solid phase extraction procedure with C18 solid-phase columns. An enrichment factor of 333 is achieved. The coefficients of variation of the method were lower than 8% at 3 μg L−1 herbicides concentration level. Recoveries ranged between 93 and 105%. The results obtained indicate that the proposed method is well suitable for monitoring phenylureas in compliance with the European Community standard for drinking water.
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