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EC number: 200-262-8
CAS number: 56-23-5
CTC is rapidly biodegradable under anaerobic conditions and may biodegrade under aerobic conditions at non toxic concentrations (at or below 10 mg/L).
Several articles report a rapid
biodegradation of carbon tetrachloride under anaerobic conditions, in
denitrifying as well as in methanogenic conditions. These investigations
revealed evidence that not only dehalogenation to transient chloroform
but also complete mineralisation to CO2.
Under aerobic conditions, Tabak at al.,
in 1981, have observed a rapid disappearance in conditions were
volatilisation is under control. It can be concluded to a rapid primary
biodegradation. The only other study that has been carried out under
aerobic conditions is reported by Japanese Authorities on the CERI
website. No ultimate biodegradation has been observed, few information
is available on the study, but the tested concentration of 100 mg/L (in
accordance to MITI(I) / OECD 301C guideline) may have biased the result,
being in a toxic range. In the absence of results of a test made in
accordance to OECD guidelines at lower concentrations, ready
biodegradability of carbon tetrachloride cannot be assumed.
A detailed review of the
biodegradability of chlorinated aliphatic compounds has been done by
J.A. Field and R. Sierra-Alvarez from University of Arizona and has been
published by EuroChlor in 2004. With respect to CTC, this review reports
several observations made under real environmental conditions such as
landfills and in bioreactors. It is concluded that CTC is almost
completely biodegraded under anaerobic conditions by co-metabolism.
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