Reactive uptake coefficients for heterogeneous reaction of N2O5 with submicron aerosols of NaCl and natural sea salt
Other literature type
Stewart, D. J.
Griffiths, P. T.
Cox, R. A.
mesheuropmc: complex mixtures
The kinetics of uptake of gaseous N<sub>2</sub>O<sub>5</sub> on submicron aerosols containing NaCl and natural sea
salt have been investigated in a flow reactor as a function of relative humidity (<i>RH</i>) in the range
30-80% at 295±2K and a total pressure of 1bar. The measured uptake coefficients, γ, were
larger on the aerosols containing sea salt compared to those of pure NaCl, and in both cases
increased with increasing <i>RH</i>. These observations are explained in terms of the variation in the
size of the salt droplets, which leads to a limitation in the uptake rate into small particles. After
correction for this effect the uptake coefficients are independent of relative humidity, and agree
with those measured previously on larger droplets. A value of γ=0.025 is recommended for the
reactive uptake coefficient for N<sub>2</sub>O<sub>5</sub> on deliquesced sea salt droplets at 298K and <i>RH</i>>40%.