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Products and mechanisms of the reaction between the nitrate radical (NO(3)) and three of the most abundant reduced organic sulphur compounds in the atmosphere (CH(3)SCH(3), CH(3)SH and CH(3)SSCH(3)), have been studied in a 480 L reaction chamber using in situ FT-IR and ion chromatography as analytical techniques. In the three reactions, methanesulphonic acid was found to be the most abundant sulphur containing product. In addition, the stable products SO(2), H(2)SO(4), CH(2)O and CH(3)ONO(2) were identified and quantified and thionitric acid-S-methyl ester (CH(3)SNO(2)) was observed in the i.r. spectrum from all of the three reactions. Deuterated dimethylsulphide (CD(3)SCD(3)) showed an isotope effect on the reaction rate constant (k(H)/k(D)) of 3.8 +/- 0.6, indicating that hydrogen abstraction is the first step in the NO(3) + CH(3)SCH(3) reaction, probably after the formation of an initial adduct. On the basis of the products and intermediates identified, reaction mechanisms are proposed for the three reactions.

Additional information

Authors: JENSEN N R, JRC Ispra (IT);HJORTH J, JRC Ispra (IT);LOHSE C, JRC Ispra (IT);SKOV H, JRC Ispra (IT);RESTELLI G, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Seventh International Symposium of the Commission on Atmospheric Chemistry and Global Pollution (CACGP), Chamrousse (FR), September 5-11, 1992
Availability: Available from (1) as Paper EN 35624 ORA
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