Laboratory Studies of the Sensitivity of Tropospheric Ozone to the Chemistry of Sea Salt Aerosol. Final Report, September 15, 1993--September 14, 1994 Page: 8 of 18
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7
Table 1: Relative Rate Constants for Chlorine Atom Reactions with Simple
Alkanesa
This Atkinson & Wallington Lewis
Pair of Compounds Study Aschmann et. al. et. al.b
(1985) (1988) (1980)
Ethane/Propane 0.441 0.036 0.476+0.022 0.484+0.039 0.363+0.049
Ethane/n-Butane 0.283+0.047 0.324+0.009 0.344+0.026 0.244+0.034
i-butane/ 0.655+0.049 0.695+0.009 0.671+0.042 0.649+0.078
n-butane
aErrors shown are two standard deviations.
bRelative rate values shown are the ratios of the absolute measurements.
Since the rate constants for the chlorine atom reactions with
the unsaturated biogenics will be pressure dependent, we also tried
some runs using these cells and repressurizing to one atmosphere
total pressure after each sample was removed for GC analysis. The
rate constants obtained had much poorer precision and exhibited some
systematic errors.
As a result, we have set up a relative rate system employing a
collapsible Teflon reaction chamber which allows a constant pressure
to be maintained while sampling over the course of an experiment. We
have constructed a bank of fluorescent lights for photolysis of the
C12-organic mixtures in the 50 L Teflon chambers, and are using
larger loops on the gas sampling valve to increase the sensitivity by
a factor of -40. This will allow us to work in the low ppm-high ppb
range more closely approximating concentrations found in the
troposphere.
Currently working on this project are Ms. Lisa Abato and Mr.
Mark Ragains, with the assistance of Dr. Ruaidhri Neavyn who used a
similar system for his Ph.D. work in Ireland. Lisa worked on this as
part of her senior research project required of all of our
undergraduates for their B.S. degree; she graduated in December and
worked full time on the project until she entered the Ph.D. program
at the University of California, Irvine, this fall. Mark is a high
school teacher who is working on this as part of his Master's degree.
He is supported by a Research Corporation "Partners in Science" grant
which covers his summer stipend for 1994 and 1995.
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Finlayson-Pitts, B. J. Laboratory Studies of the Sensitivity of Tropospheric Ozone to the Chemistry of Sea Salt Aerosol. Final Report, September 15, 1993--September 14, 1994, report, November 15, 1994; Fullerton, California. (https://digital.library.unt.edu/ark:/67531/metadc1276317/m1/8/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.