Skip common site navigation and headers
United States Environmental Protection Agency
Exposure Research
Begin Hierarchical Links EPA Home > Research & Development > Exposure Research > Publications/Presentations > End Hierarchical Links

 

Supplement to EPA Compendium Method to-15 Reduction of Method Detection Limits to Meet Vapor Intrusion Monitoring Needs

spacer
spacer
Abstract: The Supplement to EPA Compendium Method TO-15 provides guidance for reducing the method detection limit (MDL) for the compound 1,1-dichloroethene (1,1-DCE) and for other volatile organic compounds (VOCs) from 0.5 parts per billion by volume (ppbv), as cited in Method TO-15, to much lower concentrations. Revisions were made to the wording of Method TO-15 where the original language proved limiting to the goal of extending Method TO-15 to low parts per trillion by volume (pptv) levels or where minor omissions were observed. Also, recommendations in the form of additions were made on aspects of laboratory procedure deemed critical to low-pptv-level analysis. Specifically, the MDL for 1,1-DCE was determined to be 6 pptv. During this effort, a capability for preparing 1,1-DCE sample concentrations of 30 pptv and 60 pptv in ambient air was developed. Using this capability and the capability to prepare samples of humidified zero air, samples were prepared in canisters and sent to three contract laboratories as unknowns. Subsequent comparison of results indicated close agreement among the laboratories while maintaining the performance standards for replicate precision (25%) and audit accuracy (30%) originally specified in Method TO-15. The following compounds were also detected at low pptv levels in canisters filled with spiked ambient air: chloroethene, dichloromethane, cis-1,2-dichloroethene, trichloromethane, 1,2-dichloroethane, benzene, 1,1,1-trichloroethane, trichloroethene, and tetrachloroethene. Since the different laboratories employed different analytical procedures, the use of a performance-based method appears justified.

This work has been partially funded by the United States Environmental Protection Agency under Contract 68-D-00-206 to ManTech Environmental Technology, Inc. This paper has been reviewed in accordance with the Agency's peer and administrative review policies and approved for presentation and publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
spacer
Citation:Daughtrey Jr., E. H., K. D. Oliver, H. H. Jacumin Jr., and W. A. Mcclenny. Supplement to EPA Compendium Method to-15 Reduction of Method Detection Limits to Meet Vapor Intrusion Monitoring Needs. Presented at Symposium on Air Quality Measurement Methods and Technology, Research Triangle Park, NC, April 20-22, 2004EPA/600/A-04/061 (NTIS PB2004-106810).
spacer
spacer
Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
spacer
Division: Human Exposure & Atmospheric Sciences Division
spacer
Branch: Process Modeling Research Branch
spacer
Product Type: Sympos/Conf
spacer
Presented: 04/20/2004
spacer
Related Entries:
spacer
Bullet Item Improvement in Air Toxics Methods for Volatile Organic Compounds
spacer Relationship Reason:   A Project of the Product
spacer
spacer
spacer

 

ORD Home | Search EPA | Search NERL | Search EIMS | Contacts | Help

 
Begin Site Footer

EPA Home | Privacy and Security Notice | Contact Us

Last Updated on Monday, October 22, 2007
URL: http://cfpub.epa.gov