|
| |
CH3Br, this halocarbon is released, to a
degree, naturally from the oceans, but is more commonly released from its
anthropogenic use as a soil fumigant or pesticide. Methyl bromide is persistent
enough to reach the stratosphere where it photochemically decomposes to yield
atomic bromine (radical) and proceeds to destroy stratospheric ozone in the same
manner as the atomic chlorine radical. On an atom-for-atom basis, stratospheric
bromine is more efficient at destroying ozone than is chlorine because the HBr
reservoir species is more photochemically active than HCl; however, there is
much less of hydrogen bromide in the stratosphere.
[Baird, Colin. Environmental
Chemistry. (1999) W.H. Freeman, New York.]
| |
|
