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CONTROLLED METHYL TERTIARY BUTYL ETHER (MTBE) EXPOSURE TO HUMANS THROUGH DERMAL, INGESTION, AND INHALATION ROUTES AND THE RESULTANT BIOMARKER TERTIARY BUTYL ALCOHOL (TBA) AS MEASURED IN EXHALED BREATH AND VENOUS BLOOD
Citation:
Pleil, J D., J D. Prah, D. Ashley, M W. Case, AND M Colon. CONTROLLED METHYL TERTIARY BUTYL ETHER (MTBE) EXPOSURE TO HUMANS THROUGH DERMAL, INGESTION, AND INHALATION ROUTES AND THE RESULTANT BIOMARKER TERTIARY BUTYL ALCOHOL (TBA) AS MEASURED IN EXHALED BREATH AND VENOUS BLOOD. Presented at EPA/NIEHS In-House Workshop on Applying Biomarker Research, Chapel Hill, NC, August 30-31, 1999.
Description:
Radiocarbon (14C) measurements provide an estimate of the fraction of carbon in a sample that is biogenic. In September 1997 during SCOS97 a series of 3-h canister samples of ambient air were collected at the Azusa air monitoring station during morning and afternoon periods. The fraction of VOC that was biogenic ranged from 0 to 38% for the 10 samples on which 14C measurements were performed, with a mean value of 15 %. GC-FID measurements were also performed on the same samples. The presentation will give details of the results along with a description of the technology involved in the sampling, sample preparation, and 14C analysis (by accelerator mass spectrometry). In addition an example of how similar measurements performed in Atlanta were related to emissions inventories will be given.
This work has been funded wholly or in part by the United States Environmental Protection Agency under Interagency Agreement No. 13937923 to the National Institute of Standards and Technology, and Contract No. 68-D5-0049 to ManTech Environmental Technology, Inc. It has been subjected to Agency review and approved for publication.