non-combustion oriented volatization

[cmcr@ism.net (Cold Mountain, Cold Rivers)]

dr. shadoff wrote "animals selectively retain the 2,3,7,8 isomers".

i have heard that these and other planar congeners pass through the gut
preferentially over more 3-D molecules.  considering ~90% of our exposure
seems to come from the air emissions-to-food pathway, this is obviously a
critical factor, yet i have heard very little discussion.  anyone have more
info on this issue?

also, dr. s. mentioned in a reply to me that in dioxin photolysis involving
-OH (eg in moist environment), the C-Cl bond is the weakest and
hydro/photolyzes first.  this jibes w/ what chemists on sci.environment
have been telling me recently in a debate, but i have not yet heard a
reconciliation with the fact that in isolation, the C-Cl bond--and
C-halogen bonds generally--take the nost energy to break.  this is
obviously critical to the whole call for phase-out of (almost all) the
chlorine industry.  in english, what causes so dramatic a change from the
simple 'model' to the real world situation?


Tony Tweedale           || "I'm not going to get involved in any
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----------------------------|| "A species goes out of existence every 20
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