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Development of a real-time monitor for volatile fine particulate matter

Conference ·
OSTI ID:351209
;  [1];  [2];  [3]
  1. Brigham Young Univ., Provo, UT (United States)
  2. Rupprecht and Patashnick Co., Inc., Albany, NY (United States)
  3. Environmental Protection Agency, Research Triangle Park, NC (United States). National Center for Environmental Assessment
+ Show Author Affiliations
Fine particles in urban environments contain substantial quantities of material which can be lost from the particles during sample collection on a filter. These include ammonium nitrate and semi-volatile organic compounds. Methods for the accurate collection of these species in integrated samples have been developed using diffusion denuder samplers. It is often desirable to determine fine particulate material on a real-time basis. Instruments such as the TEOM monitor are available for this purpose. However, these real-time instruments will also suffer from inaccuracies in the determination of volatile particulate species. The authors have combined diffusion denuder and TEOM technology to develop an instrument for the monitoring of fine particulate mass, including volatile species. The new instrument uses a particle concentrator, a diffusion denuder, and a membrane dryer before the TEOM monitor to concentrate the particles and remove gas phase species. The normal TEOM monitor Teflon coated fiber filter is replaced with a sorbent filter. The effects of changing the sorbent material, and of the sampled air humidity and temperature have been studied. Comparisons of real-time measurements with the modified system, measurements with a conventional TEOM monitor and integrated measurements using diffusion denuders will be presented.
OSTI ID:
351209
Report Number(s):
CONF-970677--
Country of Publication:
United States
Language:
English

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Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
AIR POLLUTION MONITORING
AIR POLLUTION MONITORS
AMMONIUM NITRATES
ORGANIC COMPOUNDS
PARTICULATES
TECHNOLOGY ASSESSMENT
VOLATILE MATTER