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The photodegradation of trichloroacetyl chloride and trichloroacetic acid in an aerosol smog chamber

: Behnke, W.; Zetzsch, C.

Univ. Dublin:
Kinetics and mechanisms for the reactions of halogenated organic compounds in the troposphere
Dublin, 1991
STEP-HALOCSIDE/AFEAS Workshop <1991, Dublin>
Fraunhofer ITA ( ITEM) ()
aerosol; air pollution; atmospheric chemistry; chemistry; photochemical smog; photochemistry; pollutant; smog chamber

The UV absorption spectrum of trichloroacetyl chlorideis determined in the gas phase. The compound absorbs UV below 320 nm, and direct photolysis by a tropospheric solar simulator yields phosgene, HCl and trace amounts of CCl4. Surface assisted hydrolysis of trichloroacetyl chloride obscures the observed kinetics and leadsto the corresponding acid. The photodegradation of this hydrolysis product, trichloroacetic acid, yields phosgene, HCl and atomic Cl. The formation of CCl4 is observed to arise mainly from heterogeneous reactions involving acidic surfaces and to be catalyzed by HCl and NaCl aerosol, though the mechanism for the formation of the products remains unclear. The influence of NaCl aerosol at the mg m-3 level on the heterogeneous processes is investigated.