Gas chromatographic determination of residue levels of the herbicides trifluralin, benefin, ethalfluralin, and isopropalin in soil with confirmation by mass selective detection.
A method is presented for the simultaneous or individual determination of the dinitroaniline herbicides trifluralin, benefin, ethalfluralin, and isopropalin in soil. The herbicides are extracted with acetonitrile-water (99 + 1), and the extracts are purified with small, disposable Florisil cartridges prior to analysis by gas chromatography using an electron capture detector or a mass selective detector. When electron capture detection is used as the primary detection system, confirmation with selective detection can be obtained using gas chromatography-mass spectrometry with a mass selective detector and a capillary column operated in the split mode. The limit of detection is 0.01 ppm, and recoveries averaged 95-112% for the 4 herbicides in several different soil types fortified at levels of 0.01-0.33 ppm.
West
S D
SD
Division of Eli Lilly and Co., Greenfield, IN 46140.
Weston
J H
JH
Day
E W
EW
D000814:Aniline Compounds / Q000032:analysis; D002849:Chromatography, Gas; D006540:Herbicides / Q000032:analysis*; D007202:Indicators and Reagents; D013058:Mass Spectrometry; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D014052:Toluidines / Q000032:analysis; D014274:Trifluralin / Q000031:analogs & derivatives / Q000032:analysis
D000814:Aniline Compounds; D006540:Herbicides; D007202:Indicators and Reagents; D010573:Pesticide Residues; D012987:Soil; D014052:Toluidines; C005947:benefin; C027392:ethafluralin; C008200:isopropalin; D014274:Trifluralin