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COS, a gas that is very stable and not reactive in
the troposphere, but, it is thought, photolyzes to form carbon monoxide, CO, and
sulfur, S, in the stratosphere. Through stratospheric chemical reactions, the
sulfur atoms are converted to SO2 and H2SO4
which form sulfate aerosol and cloud condensation nuclei, but which eventually
settle into the troposphere and reacts to form sulfuric acid, a component in
acid rain. The major biospheric sources of COS are thought to be biological.
[Analytical Chemistry; v 65; pages 976-982; 1993.] [Atmospheric Chemical
Compounds: Sources, Occurrence, and Bioassay; Graedel, Hawkins, Claxton; page
513; 1986; Academic Press; Orlando.]
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