uptake coefficients for heterogeneous reaction of N2O5 with submicron aerosols of NaCl and natural sea salt. Abstract. The kinetics of uptake of gaseous N 2 O 5 on submicron aerosols containing NaCl and natural sea salt have been investigated in a flow reactor as a function of relative humidity (RH ) in the range 30-80% at 295±2 K and a total pressure of 1 bar. The measured uptake coefficients, γ , were larger on the aerosols containing sea salt compared to those of pure NaCl, and in both cases

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... increased with increasing RH . 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 2 O 5 on deliquesced sea salt droplets at 298 K and RH >40%.