Determination of aryloxyphenoxypropionic acid herbicides in water using different solid-phase extraction procedures and liquid chromatography-diode array detection

Journal of Chromatography. a
A LaganàA Marino

Abstract

For isolation and trace enrichment of aryloxyphenoxypropionic acid (ArPP) herbicides from drinking, spring, and ground water a sensitive, robust method is presented. A 1-2 1 volume of aqueous samples was passed through a disposable solid-phase extraction cartridge, packed with 500 mg of Carbograph-1 at a flow-rate of 100 ml/min. After washing, ArPPs are selectively eluted with 8 ml of dichloromethane-methanol (80:20, v/v) with 50 mmol/1 formic acid and evaporated to dryness. The mixture was reconstituted with 250 microliters of water-acetonitrile (75:25; v/v) acidified with 0.1% trifluoroacetic acid and 100 microliters was injected into the high-performance liquid chromatography system. The ArPPs were separated via a binary gradient of water and a mixture of methanol-acetonitrile. Detection and confirmation were performed by diode array detection. Recovery of the six acid herbicides ranged between 90% and 98%. The limits of detection of ArPPs were 7-20 ng/l for drinking water and 16-36 ng/l for spring water. In terms of recovery and selectivity the effectiveness of Carbograph-1 cartridges was compared with that of LiChrolut-EN cartridges and polystyrene-divinylbenzene Empore disks. Relevant parameters such as pH and flow-rate f...Continue Reading

Citations

Oct 31, 2006·Journal of Separation Science·Magdalena Biesaga, Krystyna Pyrzynska
Oct 1, 2005·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Gül OzhanBuket Alpertunga

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