|Marek, Le Etta - MN DEPT OF AGRICULTURE|
Submitted to: Canadian Society of Chemistry Conference
Publication Type: Abstract Only
Publication Acceptance Date: March 15, 2005
Publication Date: May 28, 2005
Citation: Koskinen, W.C., Marek, L.J. 2005. Lc/MS/MS multiresidue analysis of polar pesticides in soil and water [abstract]. Canadian Society of Chemistry Conference. p. 7. Technical Abstract: Traditionally, pesticide analysis has been by gas chromatography (GC) coupled to various detectors. However, many of the newer classes of pesticides are polar, nonvolatile chemicals, which are not amenable to analysis by GC. These pesticides have primarily been derivatized prior to analysis by GC or analyzed by high performance liquid chromatography (HPLC) with UV, diode array, and fluorescence detection, which in many cases are not sufficiently sensitive for trace pesticide analysis and do not provide confirmation. The use of HPLC coupled to MS and MS/MS detectors by electrospray interfaces has become more commonly used for determination of polar pesticides at trace levels in environmental matrices. For instance, we have developed multi-residue methods for the confirmation and quantitation of cyclohexanedione oxime herbicides (i.e. alloxydim, clethodim, sethoxydim) and their sulfoxide metabolites, sulfonylurea and imidazolinone herbicides (i.e. chlorsulfuron, metsulfuron-methyl, thifensulfuronmethyl, triasulfuron, imazethapyr, imazamox) in soil and water by LC/ES/MS and LC/ES/MS/MS. After extraction and cleanup by C18-SPE, limits of quantitation were <0.1 g L-1 for water and <1.0 g kg-1 for soil. Similar methods have also been used for confirmation and quantitation of coumarin (i.e. bromoadiolone, warfarin) and indandione (i.e. chlorophacinone, pindone) rodenticides in different matrices with detection limits as low as 1-5 g kg-1. These multi-residue methods should also be appropriate for other related pesticides.