Journal of AOAC INTERNATIONAL · 1991 · 16 citations · 0 references
AgricultureSoil SciencesToxicologyMass Spectrometric AnalysisPesticide ToxicologySoil ChemistryHerbicide Analytical ChemistryHerbicide Residue ChemistryHerbicide ScienceHerbicide ToxicologyPesticide Residue AnalysisCapillary ChromatographyCapillary Gas ChromatographyChromatographic Analysis Of HerbicidesEnvironmental Monitoring Of HerbicidesHerbicide Residue DetectionQuantitative Analysis Of HerbicidesSoil Herbicide ResiduesSoil Residue Analysis
Abstract A double space extraction procedure was developed to simultaneously determine neutral herbicides (trifluralin, dlclofop- methyl, and triallate) and acid herbicides (MCPA, 2,4-D, bromoxynil, and picloram) in soil. The method uses capillary column gas chromatography (GC) and mass spectrometry (MS) detection with a high degree of confidence in the interpretation of herbicides in many soil types to the 0.003 ppm level. Detection limits at these low levels are possible because extracts can be concentrated by a factor of 50 with few coextractlve interferences evident in the chromatography. Recovery data are excellent for both groups of herbicides (81.5-97.8%, average); relative standard deviations vary from 15-23% because of a larger response variation using GC/MS detection.