US EPA

1741531 

Journal Article 

Reductive transformation of trichloroethene by cobalamin: Reactivities of the intermediates acetylene, chloroacetylene, and the DCE isomers 

Semadeni, M; Chiu P-C; Reinhard, M 

1998 

1 

Environmental Science & Technology
ISSN: 0013-936X
EISSN: 1520-5851 

BIOSIS/98/18435 

32 

9 

1207-1213 

English 

10.1021/es9705248 

WOS:000073404400025 

https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032080846&doi=10.1021%2fes9705248&partnerID=40&md5=2ce061fa7beb9dbb19286d341c1ee087
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BIOSIS COPYRIGHT: BIOL ABS. The transformations of acetylene, chloroacetylene, 1,1-dichloroethene (DCE), and cis- and trans-DCE mediated by cobalamin in the presence of titanium(III) citrate were investigated at pH 8 and 22?C. Acetylene quantitatively reacted to ethene via vinylcobalamin as the proposed intermediate. Chloroacetylene reacted to acetylene and vinyl chloride. Proposed intermediates are ethynylcobalamin and vinylcobalamin, respectively. The principal initial reaction of chloroacetylene formed ethynylcobalamin which decomposed to acetylene. The proposition for ethynyl- and vinylcobalamin formation is based on fitting reaction models to kinetic data. Kinetic modeling suggests half-lives for ethynyl- and vinylcobalamin of 1.4 and 251 h, respectively. 1,1-Dichloroethene reacted to approximately 20% volatiles (ethene, ethane, vinylchloride, and acetylene) and 80% unidentified nonvolatile products. cis- and trans-DCE transformed slowly and produced small yields of vinyl chloride, ethene, a 

Mathematical Biology and Statistical Methods; Biochemical Studies-General; Biophysics-Molecular Properties and Macromolecules; Biophysics-Biocybernetics (1972- )