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The reactivity of a deactivated salt surface after uptake could be partially restored by cycling through an elevated relative humidity at atmospheric pressure. The overall surface reactivity decreased in the series Na2SO4 NaCl (NH4)2SO4 NH4NO3. The uptake on NH4NO3 was nearly fully reversible, with low values of the initial (0.4 × 10-2) and steady-state (3.3 × 10-4) uptake coefficients, whereas Na2SO4 was significantly more reactive (3.1 × 10-2 and 1.7 × 10-3). Depending on the aerosol loading, the lifetimes of gaseous Hg
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