Fenton's reagent is the result of reaction between @entity273 ( @entity274 ) and ferrous @entity68 ( @entity8798 ), producing the @entity3787 radical (-* @entity2145 ). The @entity3787 radical is a strong oxidant capable of oxidizing various organic compounds. The mechanism of oxidizing @entity4965 ( @entity4966 ) in groundwater and soil slurries with Fenton's reagent and the feasibility of injecting Fenton's reagent into a sandy aquifer were examined with bench-scale soil column and batch experiment studies. Under batch experimental conditions and low pH values ( approximately 3), Fenton's reagent was able to oxidize 93-100% (by weight) of dissolved @entity4966 in groundwater and 98-102% (by weight) of @entity4966 in soil slurries. @entity273 decomposed rapidly in the test soil medium in both batch and column experiments. Due to competition between @entity274 and @entity4966 for @entity3787 radicals in the aqueous solutions and soil slurries, the presence of @entity4966 significantly decreased the degradation rate of @entity274 and was preferentially degraded by @entity3787 radicals. In the batch experiments, Fenton's reagent was able to completely dechlorinate the aqueous-phase @entity4966 with and without the presence of soil and no VOC intermediates or by-products were found in the oxidation process. In the soil column experiments, it was found that application of high concentrations of @entity274 with addition of no @entity8798 generated large quantities of gas in a short period of time, sparging about 70% of the dissolved @entity4966 into the gaseous phase with little or no detectable oxidation taking place. Fenton's reagent completely oxidized the dissolved phase @entity4966 in the soil column experiment when @entity4966 and Fenton's regent were simultaneously fed into the column. The results of this study showed that the feasibility of injecting Fenton's reagent or @entity274 as a Fenton-type oxidant into the subsurface is highly dependent on the soil oxidant demand (SOD), presence of sufficient quantities of ferrous @entity68 in the application area, and the proximity of the injection area to the zone of high aqueous concentration of the target contaminant. Also, it was found that in situ application of @entity274 could have a gas-sparging effect on the dissolved VOC in groundwater, requiring careful attention to the remedial system design.

The mechanism and applicability of in situ oxidation of XXXX with Fenton's reagent.

@entity8798 :: ('CHEBI:29033', 'Chemical') :: ['Fe(2+)'] @entity274 :: ('CHEBI:16240', 'Chemical') :: ['H(2)O(2)'] @entity4966 :: ('CHEBI:16602', 'Chemical') :: ['TCE'] @entity3787 :: ('MESH:D017665', 'Chemical') :: ['hydroxyl'] @entity273 :: ('MESH:D006861', 'Chemical') :: ['Hydrogen peroxide', 'hydrogen peroxide'] @entity4965 :: ('MESH:D014241', 'Chemical') :: ['trichloroethylene'] @entity2145 :: ('MESH:C031356', 'Chemical') :: ['OH'] @entity68 :: ('MESH:D007501', 'Chemical') :: ['iron']
@entity4965 :: (MESH:D014241,Chemical) :: ['trichloroethylene']
