Determination of chlorinated acid herbicides in vegetation and soil by liquid chromatography/electrospray-tandem mass spectrometry.
The method presented uses reversed-phase liquid chromatography with negative electrospray ionization and tandem mass spectrometry to analyze 9 chlorinated acid herbicides in soil and vegetation matrixes: clopyralid, dicamba, MCPP, MCPA, 2,4-DP, 2,4-D, triclopyr, 2,4-DB, and picloram. A 20 g portion is extracted with a basic solution and an aliquot acidified and micropartitioned with 3 mL chloroform. Vegetation samples are subjected to an additional cleanup with a mixed-mode anion exchange solid-phase extraction cartridge. Two precursor product ion transitions per analyte are measured and evaluated to provide the maximum degree of confidence in results. Average recoveries for 3 different soil types tested ranged from 72 to 107% for all compounds with the exception of 2,4-DB at 56-99%. Average recoveries for the 3 different vegetation types studied were lower and ranged from 53 to 80% for all compounds.
Schaner
Angela
A
Montana Department of Agriculture, Montana State University, McCall Hall, Bozeman, MT 59717, USA.
Konecny
Jaclyn
J
Luckey
Laura
L
Hickes
Heidi
H
D015084:2,4-Dichlorophenoxyacetic Acid / Q000031:analogs & derivatives / Q000032:analysis; D008456:2-Methyl-4-chlorophenoxyacetic Acid / Q000032:analysis; D000838:Anions; D002138:Calibration; D002713:Chlorine / Q000032:analysis*; D002852:Chromatography, Ion Exchange / Q000379:methods; D002853:Chromatography, Liquid / Q000379:methods*; D003996:Dicamba / Q000032:analysis; D006016:Glycolates / Q000032:analysis; D006540:Herbicides / Q000032:analysis*; D010846:Picloram / Q000032:analysis; D010848:Picolinic Acids / Q000032:analysis; D015203:Reproducibility of Results; D012987:Soil; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
D000838:Anions; D006016:Glycolates; D006540:Herbicides; D010848:Picolinic Acids; D012987:Soil; C011767:clopyralid; D015084:2,4-Dichlorophenoxyacetic Acid; D002713:Chlorine; D008456:2-Methyl-4-chlorophenoxyacetic Acid; C010571:dichlorprop; C032742:triclopyr; D010846:Picloram; D003996:Dicamba; C004764:4-(2,4-dichlorophenoxy)butyric acid