I HAVE A HUGE PROJECT DUE TOMORROW AND I HAVE NO IDEA WHAT MAKES BROMINE LEVELS HIGH
2007-12-09 14:42:05 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Where does the bromine come from?
The largest source of stratospheric Bromine is methyl bromide,
CH3Br. Much of this is natural (as with CH3Cl), but 30 - 60% is
manmade. [Khalil et al.] It is widely used as a fumigant. Another
important source is the family of "halons", widely used in fire
extinguishers. Like CFC's these compounds have long atmospheric
lifetimes (72 years for CF3Br) and very little is lost in the
troposphere. [Wayne p. 167]. At the bottom of the stratosphere
the total Br mixing ratio is ~20 parts-per-trillion (pptv), of which ~
8 pptv is manmade. [AASE] Uncertainties in these numbers are relatively
larger than for Cl, because the absolute quantities are so much smaller,
and we should expect to see these estimates change. Halons have been
restricted under the Montreal Protocol, and regulations on methyl
bromide use are under consideration.
2007-12-09 14:56:28 · answer #1 · answered by gureet2001 2 · 0⤊ 0⤋
High in what? And how high compared to what?
Think about what you are trying to establish or explain.
2007-12-09 22:47:01 · answer #2 · answered by Facts Matter 7 · 0⤊ 0⤋
I have to find easy ways to get two points and you have provided it. What is your question?
2007-12-09 22:52:57 · answer #3 · answered by cattbarf 7 · 0⤊ 0⤋