DETERMINATION OF LINURON IN AQUEOUS SOIL EXTRACTS BY HIGH-PERFORMANCELIQUID-CHROMATOGRAPHY

An analytical method based on high-performance liquid chromatography w ith photodiode array detection has been developed for the determinatio n of linuron in aqueous soil extracts containing different amounts of organic matter (0.7-11.7%). The detection limit of linuron in the aque ous soil extracts was 0.010 mu g/ml (0.2 ng) and the relative standard deviation for repeatability based on peak area measurement ranged bet ween 0.7 and 3.1%. Recoveries from spiked samples ranged from 106.3 to 116.1%. The method uses a C-18 reversed-phase column, a mobile phase of methanol-water (65:35, v/v) at a flow-rate of 1 ml/min and UV detec tion at 210 nm. The method was applied to determine the adsorption of linuron by soils.