From: David G. Naugler, Ph.D. (dnaugler$##$sfu.ca)
Date: Mon Apr 08 2002 - 08:35:15 EDT
Why bother to destroy it? Freon is lipophilic, polar and heavier than air.
There are soil bacteria that can consume it. E.g.
Appl Environ Microbiol 1994 Dec;60(12):4567-72
Dechlorination of trichlorofluoromethane (CFC-11) by sulfate-reducing
bacteria from an aquifer contaminated with halogenated aliphatic compounds.
Sonier DN, Duran NL, Smith GB.
Biology Department, New Mexico State University, Las Cruces 88003.
Groundwater samples were obtained from a deep aquifer contaminated with
halogenated aliphatic compounds. One-milliliter samples contained 9.2 x
10(5) total bacteria (by acridine orange microscopic counts) and 2.5 x 10(3)
sulfate-reducing bacteria(by most probable number analysis). Samples were
incubated anaerobically in a basal salts medium with acetate as the electron
donor and nitrate and sulfate as the electron acceptors. Residual levels of
trichlorofluoromethane (CFC-11) in samples were biotically degraded, while
trichloroethylene was not. When successively higher levels of CFC-11 were
added, increasingly rapid degradation rates were observed. Concomitant with
CFC-11 degradation was the near stoichiometric production of
fluorodichloromethane (HCFC-21); the production of HCFC-21 was verified by
mass spectrometry. CFC-11 degradation was dependent on the presence of
acetate (or butyrate) and sulfate but was independent of nitrate. Other
carbon sources such as lactate and isopropanol did not support the
degradation. The addition of 1 mM sodium sulfide completely inhibited CFC-11
degradation; however, degradation occurred in the presence of 2 mM
2-bromoethanesulfonic acid. These results indicate that the anaerobic
dechlorination of CFC-11 is carried out by sulfate-reducing bacteria and not
by denitrifying or methanogenic bacteria.
--------------------
----- Original Message -----
From: "Jacek Achremowicz" <mfachrem$##$cyf-kr.edu.pl>
To: "Multiple recipients of list orglist" <orglist$##$dq.fct.unl.pt>
Sent: Monday, April 08, 2002 2:19 AM
Subject: ORGLIST: freon
> Dear Orglisters,
>
> do you know how to 'destroy' a freon - CF2Cl2?
>
> Jacek Achremowicz
> Pharmacognosy Dept.
> of the MC of the Jagiellonian University
> Krakow,
> POLAND
>
> __________________
>
> ORGLIST - Organic Chemistry Mailing List
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> List coordinator: Joao Aires de Sousa (jas$##$mail.fct.unl.pt)
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>
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