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Heterogeneous loss of OH on NaCl and NH4 NO 3 at tropospheric temperatures
Authors:A V Ivanov  Y M Gershenzon  F Gratpanche  P Devolder  J-P Sawerysyn
Institution:(1) Laboratoire de Cinétique et Chimie de la Combustion URA CNRS 876, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq Cedex, France
Abstract:The uptake coefficients () for OH radicals on some dry salts of tropospheric interest (NaCl and NH4NO3) 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 -values measured over the temperature range 245–340 K can be expressed in Arrhenius form: OHNaCl=(1.2±0.7)×10−5exp(1750±200)/T] and OHNH4NO3=(1.4±0.5)×10−4exp(1000±100)/T]. These Arrhenius expressions lead to very similar -values (\approx4×10−3) 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.
Keywords:
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