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Passive Sampler for Measurements of Atmospheric Nitric Acid Vapor (HNO3) Concentrations
Author(s) -
Andrzej Bytnerowicz,
Pamela E. Padgett,
Michael J. Arbaugh,
David R. Parker,
David Jones
Publication year - 2001
Publication title -
the scientific world journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.453
H-Index - 93
eISSN - 2356-6140
pISSN - 1537-744X
DOI - 10.1100/tsw.2001.323
Subject(s) - nitric acid , environmental chemistry , environmental science , particulates , nitrogen dioxide , air monitoring , nitrogen , pollutant , chemistry , environmental engineering , inorganic chemistry , organic chemistry
Nitric acid (HNO3) vapor is an important nitrogenous air pollutant responsible for increasing saturation of forests with nitrogen and direct injury to plants. The USDA Forest Service and University of California researchers have developed a simple and inexpensive passive sampler for monitoring air concentrations of HNO3. Nitric acid is selectively absorbed on 47-mm Nylasorb nylon filters with no interference from particulate NO3-. Concentrations determined with the passive samplers closely corresponded with those measured with the co-located honeycomb annular denuder systems. The PVC protective caps of standardized dimensions protect nylon filters from rain and wind and allow for reliable measurements of ambient HNO3 concentrations. The described samplers have been successfully used in Sequoia National Park, the San Bernardino Mountains, and on Mammoth Mountain in California.

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