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2-phenylphenol Accurately weigh acetonitrile acetonitrile-water adsorption chromatography aliquot Anal analyzed by HPLC anhydrous Na2SO4 aqueous Assoc benomyl brodifacoum carbamates carbaryl carbofuran centrifuge Chem chloroform Chromatogr column 25 cm concentrated detection limit detector at 254 dichloromethane dilute to volume DISCUSSION This method eluate Elute ethyl acetate EXPERIMENTAL PROCEDURE filter filtrate flow rate FORMULATION ANALYSIS herbicide hexane HPLC analysis HPLC method HPLC system employing Inject internal standard solution Lawrence LiChrosorb Liquid chromatography Martin and Worthing methanol methyl parathion ml of dichloromethane ml of methanol ml of water ml/min mobile phase Multiresidue Methods partition peak height ratios phase of methanol-water Pipet Reagents and Apparatus Recoveries RESIDUE ANALYSIS resmethrin RESULTS AND DISCUSSION retention reversed-phase chromatography Review of Methods Rinse rotary evaporator rotenone round-bottom flask separatory funnel Set the UV shake silica gel soil solvent stock solution Transfer tube urea UV absorbance detection UV detector volumetric flask Wash water samples