title: Method for the analysis of triadimefon and ethofumesate from dislodgeable foliar residues on turfgrass by solid-phase extraction and in-vial elution.
abstract: Triadimefon, a fungicide, and ethofumesate, an herbicide, are commonly applied to turfgrass in the Pacific Northwest, resulting in foliar residues. A simple and rapid method was developed to determine triadimefon and ethofumesate concentrations from dislodgeable foliar residues on turfgrass. Turfgrass samples were washed, and wash water containing surfactant (a 0.126% solution) was collected for residue analysis. This analytical method utilizes a 25 mm C(8) Empore disk and in-vial elution to quantitatively determine triadimefon and ethofumesate in 170 mL aqueous samples. The analytes were eluted by placing the disk in a 2 mL autosampler vial with 980 microL of ethyl acetate and 20 microL of 2-chlorolepidine, the internal standard, for analysis by GC/MS. The method quantitation limits are 0.29 microg/L for ethofumesate and 0.59 microg/L for triadimefon. The method detection limits are 0.047 microg/L and 0.29 microg/L for ethofumesate and triadimefon, respectively. Concentrations of triadimefon and ethofumesate from dislodgeable foliar residues from a field study are reported.
authors.affiliation: Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis 97331, USA. runesh@ucs.orst.edu
authors.forename: H B
authors.initials: HB
authors.lastname: Runes
authors.forename: J J
authors.initials: JJ
authors.lastname: Jenkins
authors.forename: J A
authors.initials: JA
authors.lastname: Field
mesh_terms: D001572:Benzofurans / Q000032:analysis*; D004350:Drug Residues / Q000032:analysis*; D005374:Filtration / Q000379:methods; D005659:Fungicides, Industrial / Q000032:analysis*; D006540:Herbicides / Q000032:analysis*; D008698:Mesylates / Q000032:analysis*; D015394:Molecular Structure; D006109:Poaceae / Q000737:chemistry*; D014230:Triazoles / Q000032:analysis*
chemical_list: D001572:Benzofurans; D005659:Fungicides, Industrial; D006540:Herbicides; D008698:Mesylates; D014230:Triazoles; C032910:triadimefon; C412911:ethofumesate