Consistency of ozone and nitrogen oxides standards at tropospherically relevant mixing ratios.(TECHNICAL PAPER)

Journal of the Air & Waste Management Association, October, 2005 by Bertram, Timothy H.; Cohen, Ronald C.; Thorn, William J., III; Chu, Pamela M.

ABSTRACT

The absolute accuracy and long-term precision of atmospheric measurements hinge on the quality of the instrumentation and calibration standards. To assess the consistency of the ozone ([O.sub.3]) and nitrogen oxides (N[O.sub.x]) standards maintained at the National Institute of Standards and Technology (NIST), these standards were compared through the gas-phase titration of [O.sub.3] with nitric oxide (NO). NO and [O.sub.3] were monitored using chemiluminescence and UV absorption, respectively. Nitrogen dioxide (N[O.sub.2]) was monitored directly by laser-induced fluorescence and indirectly by catalytic conversion to NO, followed by chemiluminescence. The observed equivalent loss of both NO and [O.sub.3] and the formation of N[O.sub.2] in these...

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