OXIDATION OF SULFUR COMPOUNDS OTHER THAN SO

As discussed in Chapter 2 and in more detail in Chapter 11, a variety of organic sulfur compounds in addition to inorganics such as H2S and COS are emitted by biological sources. In the troposphere, they may ultimately be oxidized to S02 and H2S04. However, the chemistry of these compounds tends to be complex, and a variety of partially oxidized sulfur compounds is formed first. 

Finally, there has been a great deal of interest in the halogen oxides IO, BrO, and CIO as potential oxidants for organic sulfur compounds such as dimethyl sulfide. We therefore also discuss the current status of these reactions. 

As a result, we focus here on what is known about the tropospheric chemistry of DMS. As we shall see, the chemistry of even this relatively simple compound is complex, and much remains to be learned about its reaction mechanisms. For larger reduced sulfur com- 

TABLE 8.17 Rate Constants and Lifetimes at Room Temperature for the Reactions of OH and NO, with Some Reduced Sulfur Compounds Emitted Biogenically  

Reactions of Dimethyl Sulfide (CH3SCH3) a. Reaction with OH 

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