Evaluation of Wipe Sampling Parameters and Surface Analysis of Organophosphorus Pesticide Environmental Samples by LC/MS

Advanced Topics in Organic Chemistry
Oral Presentation

Prepared by S. Willison1, D. Stout2, J. Starr2, A. Mysz3, D. Tabor4, B. Wyrzykowska-Ceradini5, E. Snyder1
1 - EPA, 26 W MLK Dr, Cincinnati, OH, 45268, United States
2 - U.S. EPA, National Exposure Research Laboratory, 109 TW Alexander Dr, Durham, NC, 27709, United States
3 - U.S. EPA, Office of Pesticides Program, 77 West Jackson Boulevard, Chicago, IL, 60604, United States
4 - National Risk Management Research Laboratory, 109 TW Alexander Dr, Durham, NC, 27709, United States
5 - Jacobs Technology, Inc, 109 TW Alexander Dr, Durham, NC, 27709, United States


Contact Information: willison.stuart@epa.gov; 513-569-7253


ABSTRACT

Misuse or over-application of regulated and unregulated pesticides is a growing problem amongst households and civilian areas. EPA will be tasked as the lead Agency or be involved in a supporting role when such a scenario may occur. Site characterization for remediation and restoration of public areas contaminated with pesticides and their oxidative by-products will require testing of various surface types commonly found in an urban setting (e.g., laminate, glass, metal, vinyl tile, painted drywall), corresponding to the analysis of potentially hundreds of samples. Surface investigations are important because these analytes can interact differently with varying surface types, especially porous and non-porous surfaces and other material interactions. Valuable information can be obtained when evaluating surfaces, including wipe wetting solvent selection and concentration effects of the target analytes related to highly concentrated contaminated areas. Investigations involving matrix-specific sampling and analysis methods and concentration effects from pesticide misuse are needed to ensure that an affected area is properly remediated prior to reoccupation. Multiple variables were considered, including wipe type, wipe wetting solvent selection, concentration effects on recovery efficiencies, and method performance with product formulations versus neat analyte. The purpose of this work is to present method evaluation studies for the detection of multiple organophosphorus pesticides on multiple surface types and investigate wipe sampling variables and their effects on wipe sampling efficiencies.