Quantitative Estimation of Sodium- and Ammonium-Nitrate, Ammonium Chloride, and Ammonium Sulfate in Ambient Particulate Matter

Determination of nitrate by a flow system with a chemiluminescent nitrogen oxide (NOx) analyzer

“…Thus, the apparent total nitrate formation rate is evaluated to be 4.5 % /h as an upper limit from the gradient of Fn between 9:00-10:00 and 12:00-13:00 ignoring NO* removal rate in the neighborhood of downtown Tokyo in summer. This is considered to be comparable to nitrate formation rates evaluated in the plume chemistry by Meagher et In this case, the volatility of NH4N03 (21)(22)(23) and the reaction of sulfuric acid with nitrate (24), which have been discussed as artifact nitrate terms, might result in the decrease of particulate nitrate measurement on a Teflon filter and the increase of nitric acid measurement on a polyamide filter.…”

Size distributions of ammonium nitrate and sodium nitrate in atmospheric aerosols

“…Recently, Yoshizumi et al (13) showed that it was possible to evaluate ",NO3 Recently, Yoshizumi et al (13) showed that it was possible to evaluate ",NO3…”

Total Inorganic Nitrate (Particulate Nitrate and Nitric Acid) Observations in Calgary, Alberta

“…Previous studies have shown the prin- cipal forms of ammonium in the atmosphere to be NH4NO3, (NH 4 ) 2 SO 4 , and NH 4 C1. 23 In Calgary, the abundance of these ions was strongly linked to wind speed, with highest concentrations occurring when winds were light from the southeast and the lowest values being recorded when there were strong northwest winds. Samples collected by aircraft upwind, over, and downwind from Calgary showed the existence of an urban plume of pollutants downwind from Calgary even on moderately windy days.…”