Additional work regarding Ferox SM Treatment of Freon-113
ARS continues to assess the ability of the Ferox SM powder in dechlorinating Freon-113. A recent lab study evaluated how Freon-113 is affected by the presence of the zero-valent iron during a treatability study for a site with CVOC-contaminated groundwater and soils. During the 74-day study, the major contaminant of concern, TCE, was completely reduced while the dissolved concentration of Freon-113 decreased by 55% from 3,300 ug/liter. A portion of the compound appeared to have adsorbed onto the iron particles. Concentrations of 1,2-dichloro-1,1,2-trifluoroethane, the immediate daughter product of Freon-113 were observed to increase with time. There is less evidence of sequential daughter products of 1,2-dichloro-1,1,2-trifluoroethane during the length of the treatability study. The reduction of Freon-113 was not as apparent as that of TCE. As the treatability study duration was dictated by the TCE, it was not carried out to provide more quantitative data for the reduction kinetics of Freon-113. However, the available data suggest the presence of ZVI had significant impact on the levels of Freon-113 and supports data from other lab studies showing a potential treatment effect.
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