title: Determination of phenoxyacid herbicides in water.
abstract: Novel clean-up techniques for a polymeric precolumn (PLRP-S) for the subsequent determination of bentazone and eight phenoxy acid herbicides in surface water samples are described. After preconcentration of the components at pH 3 on a 10 x 2 mm I.D. precolumn, the technique consists of a clean-up with 1000 microliters of 0.1 mol/l sodium hydroxide solution (pH 12.5) and of a heartcut consisting of four precolumn bed volumes of eluent directed to waste followed by ten precolumn bed volumes of eluent directed to the analytical column. Analytical separation is performed with acetonitrile-water (30:70) containing 0.005 mol/l of tetrabutylammonium hydrogensulphate (pH 8.3) (which is also the desorption eluent during heartcutting) on a polymeric analytical column (PLRP-S). With 25 ml of surface water, spiked at 0.25 and 1 microgram/l, applied to the precolumn, recoveries for all components were over 85% with a relative standard deviation (n = 5) of ca. 9% at 0.25 microgram/l and ca. 2% at 1 microgram/l. Detection limits in surface water samples are 0.05-0.1 microgram/l. Owing to automation, the total analysis time is ca. 30 min.
authors.affiliation: Institute for Inland Water Management and Waste Water Treatment, AA Lelystad, Netherlands.
authors.forename: R B
authors.initials: RB
authors.lastname: Geerdink
authors.forename: A M
authors.initials: AM
authors.lastname: Graumans
authors.forename: J
authors.initials: J
authors.lastname: Viveen
mesh_terms: D015085:2,4,5-Trichlorophenoxyacetic Acid / Q000031:analogs & derivatives / Q000032:analysis; D015084:2,4-Dichlorophenoxyacetic Acid / Q000031:analogs & derivatives / Q000032:analysis; D008456:2-Methyl-4-chlorophenoxyacetic Acid / Q000032:analysis; D001581:Benzothiadiazines / Q000032:analysis; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006540:Herbicides / Q000032:analysis*; D014867:Water / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D001581:Benzothiadiazines; D006540:Herbicides; D014874:Water Pollutants, Chemical; D014867:Water; D015084:2,4-Dichlorophenoxyacetic Acid; D015085:2,4,5-Trichlorophenoxyacetic Acid; C009264:fenoprop; D008456:2-Methyl-4-chlorophenoxyacetic Acid; C010571:dichlorprop; C002003:bentazone