Use of Compound-Specific Stable Isotope Analysis to Distinguish between Vapor Intrusion and Indoor Sources of VOC
ENVIRONMENTAL SECURITY TECHNOLOGY CERTIFICATION PROGRAM OFFICE (DOD) ARLINGTON VA
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Indoor sources of volatile organic compounds VOC are ubiquitous, resulting in detectable concentrations in indoor air, often at levels exceeding regulatory screening criteria. At corrective actions sites with potential vapor intrusion concerns, the presence of indoor VOC sources significantly complicates the exposure pathway evaluation. Because of these indoor sources, the detection of a site-related VOC in a potentially affected building does not necessarily indicate a vapor intrusion impact. However, because conventional investigation methods often do not clearly identify the source of VOC, additional rounds of sampling are commonly required. The overall goal of this demonstration was to validate use of compound-specific stable isotope analysis CSIA to distinguish between vapor intrusion and indoor sources of VOC. As part of this project, a step-by-step protocol has been developed, which can be used to provide an independent line of evidence to determine whether or not buildings are impacted by vapor intrusion.
- Organic Chemistry
- Physical Chemistry