title: Analysis of herbicide Krovar I by liquid chromatography with atmospheric pressure chemical ionization mass spectrometry.
abstract: A simple, very efficient method is presented for routine analysis of herbicide Krovar I (active components bromacil and diuron) in water and soil samples. Water samples were extracted by liquid-liquid extraction with dichloromethane (DCM) as extraction solvent. For soil samples two different extraction techniques were compared: microwave-assisted solvent extraction and a shaking technique using a platform shaker. Extracts were analyzed by high performance liquid chromatography using a water:methanol gradient. Liquid chromatography was coupled with atmospheric pressure chemical ionization mass spectrometry (LC-APCI-MS) for quantification of bromacil and diuron. Optimization of the APCI-MS was done by using standards in the flow injection analysis mode (FIA). Method detection limit for liquid samples for bromacil is 0.04 microg L(-1) and for diuron 0.03 microg L(-1). Method detection limit for soil samples is 0.01 microg g(-1) dry weight for both compounds. Results of analysis of field samples of water and soil are also presented.
authors.affiliation: Pacific Environmental Science Centre, Environment Canada, North Vancouver, British Columbia, Canada. vesna.furtula@ec.gc.ca
authors.forename: Vesna
authors.initials: V
authors.lastname: Furtula
authors.forename: Jen-ni
authors.initials: JN
authors.lastname: Kuo
mesh_terms: D001274:Atmospheric Pressure; D001976:Bromouracil / Q000031:analogs & derivatives* / Q000032:analysis*; D002849:Chromatography, Gas; D002853:Chromatography, Liquid; D004237:Diuron / Q000032:analysis*; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D006540:Herbicides / Q000032:analysis*; D013058:Mass Spectrometry; D012680:Sensitivity and Specificity; D012989:Soil Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006540:Herbicides; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D001976:Bromouracil; D004237:Diuron; C004590:bromacil