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OLS Field Name OLS Field Data
Main Title Method for Separating Volatile Organic Carbon from 0.1 (sup 3) of Air to Identify Sources of Ozone Precursors via Isotope (14C) Measurements.
Author Klouda, G. A. ; Norris, J. E. ; Currie, L. A. ; Rhoderick, G. C. ; Sams, R. L. ;
CORP Author National Inst. of Standards and Technology, Gaithersburg, MD.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher 1993
Year Published 1993
Report Number EPA/600/A-93/222;
Stock Number PB93-236511
Additional Subjects Volatile organic compounds ; Ozone ; Precursors ; Air pollution ; Separation ; Cryogenics ; Air sampling ; Oxidation ; Mass spectroscopy ; Carbon 12 ; Carbon 14 ; Hydrocarbons ; Reprints ;
Holdings
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NTIS  PB93-236511 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 11/22/1993
Collation 21p
Abstract Atmospheric non-methane volatile organic compounds (VOCs) are known to play an important role in urban ozone formation during the summer. To respond to the need for a direct measure of VOC source contributions from biogenic ((14)C/(12)C=10 to the -12 power) and fossil fuel ((14)C/(12)C=0) emissions, a system and protocol are being developed to separate the total VOC fraction from 0.1 cu m of ambient air for accelerator mass spectrometry (AMS) (14)C. The gas separation system developed at NIST allows for the simultaneous separation of low vapor pressure (LVP) VOCs and H2O, high vapor pressure (HVP) VOCs and CO2, CO and CH4 through sequential cryogenic separation and selective oxidation techniques. Preliminary results of this system and procedure for isolating these fractions show a LVP-VOC blank of 2 + or - microgram C, which represents the effect of the separation system plus CO2 cross-contamination. Hydrocarbons having vapor pressures greater than n-decane are not retained at a level of more than a few percent in the LVP-VOC fraction. The recovery of C5-C8 hydrocarbons in the combined HVP-VOC and CO2 fraction ranges from 27% to 78%.
Supplementary Notes Pub. in Proceedings of the AWMA/EPA Symposium, 'Measurement of Air Toxic and Related Air Pollutants', Durham, NC., May 3-7, 1993. See also PB86-120664. Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
NTIS Title Notes Symposium paper.
Title Annotations Reprint: Method for Separating Volatile Organic Carbon from 0.1 (sup 3) of Air to Identify Sources of Ozone Precursors via Isotope (14C) Measurements.
Category Codes 68A
NTIS Prices PC A03/MF A01
Primary Description 600/09
Document Type NT
Cataloging Source NTIS/MT
Control Number 330925904
Origin NTIS
Type CAT