Submitted to: Association of Analytical Communities International Midwest Section
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2003
Publication Date: 6/1/2003
Citation: Marek, L.J., Barber, B.L., Koskinen, W.C. 2003. Lc/ms analysis of cyclohexanedione oxime herbicides in water and soil. Association of Analytical Communities International Midwest Section. p. 20. Interpretive Summary:
Technical Abstract: A multiresidue method for the determination of alloxydim, (methyl 2,2-dimethyl-4,6-dioxo-5-[1-[2-propenyloxy)amino]butylidene]cyclo-hexanecarboxylate), clethodim (E,E)-()-2-[1-[[3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one), and sethoxydim (()-2-[1-(ethoxyimino)butyl]-5-[2-ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one) and two metabolites, clethodim sulfoxide ((E,E)-()-2-[1-[[3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylsulfinyl)propyl]-3-hydroxy-2-cyclohexen-1-one) and sethoxydim sulfoxide (()-2-[1-(ethoxyimino)butyl]-5-[2-ethylsulfinyl)propyl]-3-hydroxy-2-cyclohexen-1-one) in water by high performance liquid chromatography/electrospray/mass spectrometry (LC/ES/MS) is reported. River water and distilled water were spiked at 0.08 and 0.8 g L-1 with all three herbicides, which were then extracted from the water by C18-SPE. The herbicides and metabolites were quantified and confirmed using selected ion monitoring. The percent recoveries of the herbicides from water spiked at 0.8 g L-1 were as follows: alloxydim, 117 11%; clethodim, 96 14%; sethoxydim, 89 13%. There was no evidence of oxidation of clethodim and sethoxydim during the extraction to their respective sulfoxides. The limit of quantitation was < 0.1 g L-1. We have shown that we can analyze and confirm three cyclohexanedione oxime herbicides and two metabolites in water by LC/ES/MS. This multiresidue method should also be appropriate for other cyclohexanedione oximes.