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1994
Conference Paper
Titel
Formation of different photolytic precursors of atomic Cl from pure and contaminated NACl aerosol
Abstract
The uptake of N2O5 by wet, deliquescent NaCl aerosol is investigated, and the uptake coefficient, gamma, is obtained to be 0.032 +- 0.003. Two different reaction pathways occur after the uptake: a) reaction with the chloride ion to form ClNO2, b) reaction with H2O to form 2HNO3. At high NaCl concentrations above 2 mol/l typical of the aerosol the ratio of the second order rate constants ka/kb was determined in teflon bag experiments and between 0.02 and 6 mol/l with a wetted-wall flowtube technique. Both methods lead within the error to the same ration ka/kb = 60. Employing the wetted-wall flowtube apparatus below 2 mol/l of NaCl, the ratio was observed to increase drastically with decreasing Cl(-)-concentration, reaching a value of about 500 at 0.01 mol/l. On the other hand, the addition of 0.3 mol/l of Na2SO4 causes the ratio of ka/kb to remain below 100 (abstract truncated).