by EnviroEngr » Tue 01 Feb 2005, 23:04:48
$this->bbcode_second_pass_quote('', 'P').S. -- You wouldn't happen to know what the active lifespan of a CO2 molecule is versus your average particulate's lifespan?
Not off the top of my head. But, I did find this:
http://www.cac.yorku.ca/general/intro.html
wrt particulates per se, EPA has been telling the regulated community to think PM 10 and PM 2.5
In terms of my Title V Permit, when I go after PM 10, I'm chasing macromolecular compounds, silicas, metal grits and 'huge' oxides, i.e., your run-of-the-mill dust.
PM 2.5, on the other hand, tends regulatorily to be a 'regional haze' argument of sorts so that what you're looking at is NOx, SOx, COx, VOCs, metal oxide fumes and ultrafines. That 'particulate' you're referencing up there is undoubtedly one of these characters.
To see which does what, you need the oxyradical valence affinity energies (Connolly & Huckel come to mind too) for each of these molecules in 'standard state'. What that'll give you is a way to rank which ones will take on or give up an oxygen atom (by way of electron 'reactivity') first, second, third, etc. {this does a pretty good job of explaining it:
http://www.howe.k12.ok.us/~jimaskew/chem/cbond.htm } With this info in hand, now you go after the ultraviolet photon flux in the benchmark air space and see what kind of energies are present to reshuffle the atomic/molecular deck and then determine if these levels disturb and/or recombine none, some or all of the species you have in mind.
I have a CRC Chemistry and Physics Handbook. Next time it comes down to desk level, I'll look some of these things up.