Heterogeneous loss of OH on NaCl and NH 4NO 3 at tropospheric temperatures

Ivanov, A. V.; Gershenzon, Y. M.; Gratpanche, F.; Devolder, P.; Sawerysyn, J.-P.

The uptake coefficients (Γ) for OH radicals on some dry salts of tropospheric interest (NaCl and NH 4NO 3) have been investigated as a function of temperature using the flow tube technique combined with an EPR spectrometer as a detection method. The temperature dependence of Γ-values measured over the temperature range 245–340 K can be expressed in Arrhenius form: Γ OHNaCl=(1.2±0.7)×10 –5exp[(1750±200)/T] and Γ OHNH4NO3=(1.4±0.5)×10 –4exp[(1000±100)/T]. These Arrhenius expressions lead to very similar Γ-values (~4×10 –3) for both salts studied at 300 K. It is shown that the heterogeneous OH sinks on solids aerosol play a very minor role in tropospheric chemistry in comparison with the homogeneous sinks.

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Ivanov, A. V. / Gershenzon, Y. M. / Gratpanche, F. / et al: Heterogeneous loss of OH on NaCl and NH4NO3 at tropospheric temperatures. 1996. Springer Verlag.

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