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where the volatile compounds can move from aqueous to gaseous phases and <br /> have reasonable water solubility, it appeared likely 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 MThE relative to <br /> water solubility (atm m3/moll) compared with the aromatics and common soluble <br /> alkanes in groundwater from fuel spills (Reisinger, et aL, 1986, Kerfoot, 1994) <br /> 10 <br /> H=Henry s Law Constant 150 9UTAHE <br /> (atrn M31mal) 1-0 e4b • n$UTANE <br /> `rI / <br /> �Tf�RtC ISO PENTANE• 1?ENTENE <br /> zK24WOETiK�YLHEXA:NE <br /> R O� n�EHTANE� • <br /> 2 ETNYLPENTANE 1�1EXEN 1dTBE. <br /> t 0 <br /> La 5n4 EXANE • CYC�pHEJ(ANE METHANOL <br /> Q 10 i X O • BENZENE• <br /> /+ 224, <br /> nAKEPTARE�METHYLCYCLOHEXAME/ S 1 DtCHLOROETHANE H 10- <br /> LU2 4-0IMETHYLMEXANE* /TOLUENE <br /> TRIVETIMMEXANEN 10, <br /> `n-OCTANE ETH'aBENZENE / ETHANOL <br /> ILI 2 2 5 5 TETRAETHYLHEXANE m XYLENE• /ET}iYLENEDtBR0M1pE <br /> �1] 5 TRIMETHYLHEXANEE <br /> D 1 4-0IGTHYLBEHZENE � °� <br /> O 1D TETRAETKYL LEAD ° ° <br /> 1 > _ <br /> INCREASING TENDENCY 'r INCRFASMGLY MOBILE <br /> TO SORB SOILS 1N GROUND WATER <br /> 10' •DOODDECANE ylMr T <br /> f <br /> 10' I <br /> 10 10; 10' 101 10' 1 10 101 101 <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 /> 1 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 expenments, ozone was bubbled under pressure to 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 mm) were added to the flask to simulate a <br /> ' fluidized soil mixture A 10-micron 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 vaned 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 ui the gas phase was analyzed by Gastec tubes (418L per <br /> ' ANSIASEA 102-1990) In the liquid phase, ozone content was analyzed by the <br /> 1 <br />