HR: 1340h
AN: A13C-0938    [Abstracts]
TI: Development of a Thermal Dissociation Chemiluminescence Instrument for In Situ Detection of HONO
AU: * Perez, I M
EM: imperez@berkeley.edu
AF: Department Of Chemistry University of California Berkeley, Latimer Hall UC Berkeley, Berkeley, CA 94720 United States
AU: Wooldridge, P J
EM: pjwool@socrates.berkeley.edu
AF: Department Of Chemistry University of California Berkeley, Latimer Hall UC Berkeley, Berkeley, CA 94720 United States
AU: Cohen, R C
EM: rccohen@berkeley.edu
AF: Department Of Chemistry University of California Berkeley, Latimer Hall UC Berkeley, Berkeley, CA 94720 United States
AU: Cohen, R C
EM: rccohen@berkeley.edu
AF: Department of Earth and Planetary Sciences University of California Berkeley, McCone Hall UC Berkeley, Berkeley, CA 94720 United States
AB: We describe a new method for in situ detection of nitrous acid (HONO) using a combination of thermal dissociation (TD) and chemiluminescent (CL) detection of nitric oxide. A prototype was developed using a commercial NO sensor to evaluate the method. Laboratory tests for possible chemical interferences show that NO₂, peroxy nitrates, alkyl nitrates, HNO₃, O₃ and H₂O affect the measurements. A strategy for accounting for these effects is described. Our analyses show that HONO concentration observed using TD-CL will be accurate to ± 20% and that under typical urban conditions the method will have a detection limit of 5ppt.
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005