Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

An estimation of the source strength of atomic CI from aerosol smog chamber experiments on the reaction of N2O5 with NaCl at various humidities

 
: Behnke, W.; Krüger, H.-U.; Scheer, V.; Zetzsch, C.

Cox, R.A. ; European Commission:
Laboratory studies on atmospheric chemistry. Joint LACTOZ-HALIPP Workshop, CEC/EUROTRAC
Brussels, 1991 (Air pollution research report 42)
ISBN: 2-87263-083-X
pp.177-181
Joint LACTOZ-HALIPP Workshop <1991, York>
English
Conference Paper
Fraunhofer ITA ( ITEM) ()
aerosol; air pollution; atmospheric chemistry; photochemical degradation; photochemical smog; photochemistry; physical chemistry; smog chamber; sodium chloride; sticking coefficient; theoretical chemistry; troposphere

Abstract
The reaction of N2O5 with wet NaCl aerosol is observed to produce ClNo2 at high yields. The sticking coefficient of N2O5 on NaCl aerosol is determined in a smog chamber (in an inserted teflon bag) at 202 K, and the rate constant for the consecutive chemical reaction leading to formation of ClNo2 is determined at various relative humidities between 71 and 92%. A preliminary evaluation of the experiments yields a sticking coefficient of 0.03 (+0.02, -0.01), similar to that reported for pure water droplets. At the deliquescence point of NaCl, - 50% of the collisions lead to the formation of ClNo2. THis portion decreases slightly with increasing humidity. The process is expected to be an efficient sink of N2O5 in the troposphere. Model calculations indicate a significant contribution of atomic Cl to global marine tropospheric chemistry at higher latitudes of the northern hemisphere.

: http://publica.fraunhofer.de/documents/PX-13159.html