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Heterogeneous reactions of ClNO2 over aqueous solutions

: Behnke, W.; George, C.; Scheer, V.; Zetzsch, C.

Becker, K.H.:
Tropospheric oxidation mechanisms. Final report
Luxembourg: Office for Official Publications of the European Communities, 1995 (Air pollution research report 54)
ISBN: 92-827-0080-1
Workshop LACTOZ-HALIPP <1994, Leipzig>
Fraunhofer ITA ( ITEM) ()
aerosol; atmosphere; atmospheric chemistry; nitryl chloride; photochemistry; physical chemistry; theoretical chemistry; tropospheric chemistry

In the present study we have investigated, in a joint campaign between the University of Strasbourg and the Fraunhofer Institute at Hannover, the heterogeneous chemistry of nitryl chloride. We have shown, in agreement with other studies, that the uptake rate on pure water is very small but that it can be greatly enhanced by the presence of strong nucleophiles (in particular heavy halides). The reaction between iodide and ClNO2 was observed to be a direct attack of I' on the chloride. The mechanism of the reaction is believed to be a chlorine (Cl+) transfer to iodide as postulated for the oxidation of I' by chloramine. It leads to the formation of chloride, nitrite and molecular iodine. This behaviour is also expected to be valid for other nucleophiles and in particular bromide.