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where the volatile compounds can move from aqueous to gaseous phases and <br /> have reasonable water solubility, it appeared Iikely that its reaction to ozone <br /> degradation would be similar. The Henry's Constant of MTBE is about one-tenth <br /> that of the benzene derivatives Figure 1 shows the position of MTBE relative to <br /> water solubility(atm m3/mol1) compared with the aromatics and common soluble <br /> alkanes in groundwater from fuel spills(Reisinger, et aL, 1986, Kerfoot, 1994) <br /> sodFiso <br /> H=H Law CstarK WAANE <br /> (aftstrMl OnMn'hnol) •04L1TANE <br /> 1 h MSO PENTANE• •14MMENE <br /> nrEIiMAI�• , <br /> Um EC <br /> /2 .RNYLANB: •1NEn4douwlff ` METHANOL <br /> Q24AL�G 0 • BENZENE* -^rt <br /> ... 14' <br /> / •n�MEPTANE� • / 1.101CHLOROEPMANE H le <br /> W0.' r?�,� A /11DWENE• <br /> 2.2,.4. <br /> f�OCTANEneEN�E•/ ETHANOL <br /> W 10 7 / a�%7M.ENE• /ETxnasRowaE <br /> acCL <br /> � a <br /> CL <br /> 1Ga MEAD �' " �,•° �. <br /> INCREASING TENDENCY 't'• Y MOBMLE <br /> 104 TO SORB BOILMt NET � r <br /> 10� <br /> 10+ 104 10� tos 10a 1 10 Ile 10� <br /> WATER SOLUBILITY (M MOLEIL) <br /> FIGURE 1. Partitioning properties of selected gasoline constituents <br /> (modified from Reisinger,et al., 1986). <br /> BENCH-SCALE TESTING <br /> Materials and Methods. The reaction of microbubble ozone on MTBE in dilute <br /> .aqueous solution was studied under controlled experimental conditions For <br /> batch-type experiments, ozone was bubbled under pressure in 500 ml Erlenmyer <br /> flasks A corona-type ozone generator fed by oxygen was used for generation. <br /> Ten grams of fine glass beads (.3 nun) were added to the flask to simulate a <br /> fluidized soil mixture A 10-mucron porous cylinder (2 cm long x 2.5 cm <br /> diameter) was used to introduce an ozone-air mixture through the solution The <br /> pH was maintained in the range of 5 0 to 6 0 Ozone concentration, pressure, and <br /> iron silicate content were experimentally varied. After the addition of ozone, the <br /> flasks were covered and stored for 60 minutes at room temperature, and then <br /> analyzed <br /> Ozone content in the gas phase was analyzed by Gaster tubes (#18L per <br /> ANSTASEA 102-1990) In the liquid phase, ozone content was analyzed by the <br />