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Chemical Oxidation of a Groundwater Contaminant Trichloroethylene (TCE, CzHCl3, 131.4 g/mol) is an industrial solvent used as a degreaser for metal parts and for other cleaning purposes. Due to the widespread industrial use of TCE, it has become one of the most frequently detected chemicals in groundwater, where it has been quantified at concentrations up to 390 mg/L. Ingestion of TCE can lead liver problems and increased risk of cancer. Consequently, surface and groundwater contamination from TCE is a major human health concern and the drinking water limit has been set at 5 ug/L. TCE can be removed by chemical oxidation, for example, using ozone (03, 48 g/mol) as oxidant. Laboratory batch reactor tests have demonstrated that the reaction is first order in ozone and first order in TCE, second order overall. These same tests revealed that, at an aqueous ozone concentration of 5 mg/L, the half-life of TCE was 5.5 min. Consider a batch reactor using ozone to treat a groundwater containing 300 kg/L TCE. a. If the ozone concentration is maintained at 5 mg/L, how long would it take to reduce the TCE concentration from 300 ug/L to 5 mg/L? b. What is the second order rate coefficient for the reaction between ozone and TCE? Clearly indicate the units of the rate coefficient C. If an ozone concentration of 12 mg/L is used, how long would it take to reduce the TCE concentration from 300 ug/L to 5 ug/L