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

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

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996angeo..14..659i&link_type=abstract

Annales Geophysicae, vol. 14, Issue 6, pp.659-664

Physics

5

Scientific paper

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.

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