hygroscopic properties of aminium sulfate aerosols
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2017
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Abstract
Alkylaminium sulfates originate from the neutralisation
reaction between short-chained amines and sulfuric acid and have been
detected in atmospheric aerosol particles. Their physicochemical behaviour
is less well characterised than their inorganic equivalent, ammonium
sulfate, even though they play a role in atmospheric processes such as the
nucleation and growth of new particles and cloud droplet formation. In this
work, a comparative evaporation kinetics experimental technique using a
cylindrical electrodynamic balance is applied to determine the hygroscopic
properties of six short-chained alkylaminium sulfates, specifically mono-,
di-, and tri-methylaminium sulfate and mono-, di-, and tri-ethyl aminium
sulfate. This approach allows for the retrieval of a water-activity-dependent
growth curve in less than 10 s, avoiding the uncertainties that can arise
from the volatilisation of semi-volatile components. Measurements are made
on particles > 5 µm in radius, avoiding the need to correct
equilibrium measurements for droplet-surface curvature with assumed values
of the droplet-surface tension. Variations in equilibrium solution droplet
composition with varying water activity are reported over the range 0.5 to
> 0.98, along with accurate parameterisations of solution density
and refractive index. The uncertainties in water activities associated with
the hygroscopicity measurements are typically < ±0.2 % at
water activities > 0.9 and ∼ ±1 % below 0.9, with
maximum uncertainties in diameter growth factors of ±0.7 %.
Comparison with previously reported measurements show deviation across the
entire water activity range.
| Reference Key |
rovelli2017atmospherichygroscopic
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|---|---|
| Authors | ;G. Rovelli;R. E. H. Miles;J. P. Reid;S. L. Clegg |
| Journal | Journal of agricultural and food chemistry |
| Year | 2017 |
| DOI |
10.5194/acp-17-4369-2017
|
| URL | |
| Keywords |
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