Evaporation of ammonium nitrate particles

Collection efficiency of <i>α</i>-pinene secondary organic aerosol particles explored via light-scattering single-particle aerosol mass spectrometry

“…We speculate that this difference may be attributable both to the lower volatility of d 62 -squalane and to the larger molecular weight of d 62 -squalane (423 g mol −1 ) compared to ammonium nitrate (80 g mol −1 ). We estimate the d 62 -squalane vapor pressure using SIMPOL (Pankow and Asher, 2008) and use the ammonium nitrate vapor pressure reported by Richardson and Hightower (1987): ammonium nitrate is more volatile than d 62 -squalane (∼ 30 and ∼ 0.1 µg m −3 , respectively). Saleh et al (2016) calculated the differences in evaporation timescales in the AMS vaporizer for species of different volatility, while Murphy (2015) discussed the molecular weight dependence on the movement of ions from the ion source to the ion optics region in a free molecular regime.…”

Particulate Nitrate Measurement Using Nylon Filters

“…[1][2][3] Ammonium nitrate (NH 4 NO 3 ), generally the predominant form of NO 3 Ϫ in submicron aerosol particles, is formed by reaction of gaseous nitric acid (HNO 3 ) and ammonia (NH 3 ) as shown in eq 1. 4 NH 3 (g) ϩ HNO 3 (g) 7 NH 4 NO 3 (p)…”

“…In particular, there is concern that HNO 3 volatilized from NH 4 EXPERIMENTAL WORK Apparatus Annular Denuder/Filter-Pack Systems. The annular denuder/filter-pack system (URG-3000C) used in this series of field experiments was purchased from University Research Glassware, Inc. Ambient air is drawn through a cyclone (2.5-m size cut, URG-2000-30EN) by a computerized sampling pump (URG-3000-02BAM).…”

Fate of ammonia in the atmosphere?a review for applicability to hazardous releases

“…The first determinations of the mass accommodation coefficient for ammonia were made indirectly by measuring the evaporation rates of ammonium nitrate and of chloride from their aqueous solutions [18][19][20]. In the mathematical treatment of the experimental data, the mass accommodation coefficient is treated as an adjustable parameter, selected to fit the data.…”

“…Richardson and Hightower [141] levitated larger particles (2.5-3 (xm) of either solid or aqueous solutions of ammonium nitrate in a vacuum in an electric quadrupole trap and observed the rate of changes of the particles' mass and size. They observed that fresh particles evaporate at a rate of -0.23 x 10 -4 |xms -1 but that this rate decreases to -0.06 x 10 -4 (ims -1 after 4 h. For these data to agree with thermodynamic predictions, mass accommodation coefficients (evaporation coefficients) of 0.02 must be used for the initial evaporation period, decreasing to 0.004 after 4 h. This would imply that that transport between solid and vapor phases is significantly inhibited.…”