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Main Title Transformation of Carbon Tetrachloride by Pyrite in Aqueous Solution.
Author Kriegman-King, M. R. ; Reinhard, M. ;
CORP Author Stanford Univ., CA. Dept. of Civil Engineering.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1994
Year Published 1994
Report Number EPA-R-816776; EPA/600/J-94/349;
Stock Number PB94-210465
Additional Subjects Carbon tetrachloride ; Pyrite ; Bioconversion ; Water pollution ; Surface chemistry ; Sulfide minerals ; Reaction kinetics ; Anaerobic processes ; Water chemistry ; Dechlorination ; Aerobic processes ; Iron inorganic compounds ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB94-210465 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 12p
The reactivity of CCl4 with pyrite was investigated by measuring the CCl4 transformation rates and products under aerobic and anaerobic conditions. Under all reaction conditions, >90% of the CCl4 was transformed within 12-36 days in the presence of 1.2-1.4 sq m/L pyrite at 25 C. A zero-order dependence on the CCl4 concentration supports a surface-controlled reaction mechanism wherein the rate of reaction depends on the absorbed CCl4 concentration. In aerobic systems >70% of the CCl4 was transformed to CO2 whereas in a fresh-ground/anaerobic pyrite system approximately 50% of the CCl4 was transformed to CHCl3. X-ray photoelectron spectroscopy of the reacted pyrite showed that an FeOOH coating formed on the surface under aerobic conditions. Under all reaction conditions, the pyrite surface was depleted of ferrous iron.