Journal ArticleDOI
Sublimation sources for nitrous acid and other nitrogen compounds in air
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In this paper, the sources of nitrous acid and nitric acid in air in the parts-per-billion concentration range are provided by means of room-temperature oxalic acid sublimation onto solid sodium nitrite and potassium nitrate, respectively.Abstract:
Sources of nitrous acid and nitric acid in air in the parts-per-billion concentration range are provided by means of room-temperature oxalic acid sublimation onto solid sodium nitrite and potassium nitrate, respectively. Nitrogen dioxide is not present and nitric oxide is present only at a small percentage in the nitrous acid source at relative humidities in the 30-60% range. The presence of nitrous acid is verified by spectroscopic and chemical reaction studies. Nitric oxide, hydrogen cyanide, and other compounds can be similarly produced with appropriate target compounds. Nitrogen dioxide from permeation devices must be used in plastic systems to minimize impurities.read more
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Annular denuder method for sampling reactive gases and aerosols in the atmosphere
Ivo Allegrini,F. De Santis,V. Di Palo,A. Febo,C. Perrino,Massimiliano Possanzini,Arnaldo Liberti +6 more
TL;DR: The annular denuder method (ADM) as discussed by the authors was developed to measure several gaseous and aerosol species without sampling artifacts, and it has been applied to the determination of gas phase and particulate matter.
Journal ArticleDOI
Criteria for the choice of a denuder sampling technique devoted to the measurement of atmospheric nirous and nitric acids
C. Perrino,F. De Santis,A. Febo +2 more
TL;DR: In this paper, the criteria for the choice of the most appropriate denuder coating and set-up devoted to the measurement of atmospheric gaseous species are discussed and applied to the problem of nitrous and nitric acid determination in real conditions.
Journal ArticleDOI
Nocturnal loss and daytime source of nitrous acid through reactive uptake and displacement
Trevor C. VandenBoer,Trevor C. VandenBoer,Cora J. Young,Cora J. Young,Cora J. Young,Ranajit K. Talukdar,Ranajit K. Talukdar,Milos Z. Markovic,Milos Z. Markovic,Steven S. Brown,James M. Roberts,Jennifer G. Murphy +11 more
TL;DR: In this paper, Flow tube experiments and field monitoring reveal a night-time nitrous acid sink in soils, and subsequent release during the day, which contributes significantly to the atmospheric oxidation capacity.
Journal ArticleDOI
Continuous generation system for low-concentration gaseous nitrous acid
Masafumi Taira,Yukio Kanda +1 more
TL;DR: A flow type generation system based on the reaction of sodium nitrite solution with sulfuric acid has been developed for parts per billion levels of nitrous acid as mentioned in this paper, where reagent solutions are continuously pumped into a reaction vessel and drawn off to waste.
Journal ArticleDOI
Enhanced signal-to-noise ratios in the nuclear magnetic resonance analysis of solids, using large-sample magic-angle spinners
Ming. Zhang,Gary E. Maciel +1 more
TL;DR: In this article, a 6.0-cm magic-angle spinning (MAS) device was proposed for single-pulse (SP) and cross-polarization (CP) analyses with {sup 13}C, {sup 15}N, and {sup 29}Si at 4.7 T.
References
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Journal ArticleDOI
Photochemistry of NOx and HNOx Compounds
TL;DR: In this article, cross sections for absorption of radiation between 190 and 700 nm were given for N2O, NO2, NO3, NO4, NO5, HNO2, and HNO3.
Journal ArticleDOI
Tungstic acid for preconcentration and determination of gaseous and particulate ammonia and nitric acid in ambient air
Journal ArticleDOI
The ultraviolet absorption spectrum of nitrous acid in the vapor state
G. W. King,D. Moule +1 more
TL;DR: The diffuse absorption bands of HON14O, HON16O, DON16O and DON15O in the near ultraviolet have been examined in this article, where the authors attributed the weakening of the internal hydrogen bond in the cis state upon an electronic promotion of primarily nO→π* type.
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