A different mechanism for the reductive dechlorination of chlorinated ethenes: kinetic and spectroscopic evidence

Article Abstract:

Reductive dechlorination of chlorinated ethenes by anaerobic bacteria is surmised to follow a pathway wherein chloroalkylcobalamin complexes are reduced to form chlorinated ethene intermediates. The degradation is catalyzed by vitamin B12 and titanium citrate which effects a homolytic cleavage and titanium-catalyzed elimination reaction. This alternative pathway can be manipulated to reduce the release of undesirable intermediates such as vinyl chloride.

Environmental chemistry

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Enhanced dechlorination of carbon tetrachloride and chloroform in the presence of elemental iron and Methanosarcina barkeri, Methanosarcina thermophila, or Methanosaeta concillii

Article Abstract:

The ability of methanogens, such as Methanosarcina barkeri, M. thermophila and Methanosaeta concillii, in dechlorinating carbon tetrachloride and chloroform in an iron-rich medium was shown to be dependent on the availability of elemental hydrogen. Elemental hydrogen acted as an electron donor in the dechlorination process, which is effected in the excreted biomolecule specifically produced to exploit this process to support microbial metabolism.

Environmental aspects, Methanobacteriaceae, Methanogens, Chlorine compounds

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