Nik
I
have discussed the Carbazole and DBF formation in natural coals with one of my
friend who worked on his PhD in coal tars and PAHs at Silkolene and he has
confirmed although rare these compounds could be found naturally in coal beds if
the conditions were correct (temperature of >150C, for 3 or 4 days and with
sufficient oxygen depletion). We have had a brief brainstorm on the synthesis
routes and find that it is totally possible under the said conditions. Therefore
one would say if it can, it will....
Cheers
Russ
From: Russell
Corbyn [mailto:[log in to unmask]]
Sent: 07 October 2009
15:14
To: Nik Reynolds
Subject: RE: Carbazole and
dibenzofuran
Nik
I’ll
just get my pencil, sir. J
Wow.
OK. I once worked in a dye lab where we tried lots of diazotisation reactions
and this can be used to cyclitise (?) the azo link. The main reaction involves
cyclitization by Borsche-Dreschel so could potentially occur during the coal
gasification and iminisation of anthracene therefore I suspect that the
chlorinated furan would only be by people burning the coal??? Unless
chlorination of the coal has previously occurred. Both will be present at coal
tar production/management sites I think.
So
my best assumption here would be that Carbazole can occur naturally although I’m
sceptical about naturally occurring furans, especially at noticeable
concentrations.
Is
that about as useful as a handbrake on a canoe?
Russell
Russell
Corbyn MRSC FGS
Senior
Environmental Chemist
CMT
(Testing) Limited
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From: Nik
Reynolds [mailto:[log in to unmask]]
Sent: 07 October 2009
15:02
To: Russell Corbyn
Subject: RE: Carbazole and
dibenzofuran
Thanks Russell. Because they
always appear together is that because they are both there, or due to their
similarly could be mis-analysed? Sorry to pose a Columbo on you but in
NW these are the only compounds encountered in SVOC suites - trying to work out
if coal contains these compounds (due to natural geological processes) or
if these are anthropomorphic compounds, or both.
Regards
Nik
Mr N
Reynolds
BSc(Hons),
MSc, CGeol, FGS, EurGeol
Senior
Environmental Geologist
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From: Russell
Corbyn [mailto:[log in to unmask]]
Sent: 07 October 2009
14:58
To: Nik Reynolds
Subject: RE: Carbazole and
dibenzofuran
Basically
it is the amino version of the dibenzofuran.
Identical
structure (apart from the obvious) and the O, or N, have lone pairs that make
them very similar in their fate.
Theres
a lot more to go into, but that is essentially it.
Cheers
Russell
Russell
Corbyn MRSC FGS
Senior
Environmental Chemist
CMT
(Testing) Limited
Unit
5 Prime Parkway
Prime
Enterprise Park
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3QB
T:
01332 383333
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01332 602607
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www.cmt-ltd.co.uk
E:
[log in to unmask]">[log in to unmask]
P
Save a
tree...please don't print this e-mail unless you really need
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From:
Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Nik
Reynolds
Sent: 07 October 2009 14:41
To:
[log in to unmask]
Subject: Carbazole and
dibenzofuran
Apologies if this query is blindingly obvious, but being a
geologist rather than a chemist/toxicologist... (re: Corby
enquiry), can anyone tell me why carbazole and dibenzofuran tend to be
intrinsically linked. These are common compounds which crop up again and
again with SVOC suites and are often the only compounds with positive
results (above lod).
Regards
Nik
Mr N
Reynolds
BSc(Hons),
MSc, CGeol, FGS, EurGeol
Senior
Environmental Geologist
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