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10112/1995 20:44 9163519357 ANNE M FARR PAGE 21 n-alkanes in the paraffinic ftacnon. How- 10 ver. these straight-chain hydrocarbons are most susceptible to biological decom- 100 position Figures 2a and 2b show tepre- pp ti sentauve chromawgrams of ori that has tin- JP_5 . . • dergone varying degrees of biodegradation_ •o i Osl that has been srgtitficantty biodegttided i •` 0. ,� DIESEL (Figure 2a)shows tt:lauvcly ingh toncentta- ,; i tions of the two branched-chain compounds pnuane(PR)w d phytane(PH),along with polycyclic alkanes that show up toward the ;+ i •� right-hand side of rhe chtvmauWramt.As bto- IL •o ; ; ItE910-21 e degradation continues figure 2b), die re- sistant polycyclic alkanes predominate m :a .�� The matunty or age of a petroleum pro- :�_ :.. •._ duct can also be evaluated by a GC analyst e of the alkane dismbution.Figure 3a shows a o ~o 0o so chromatogram of a relatively trtimatttr+e pro- RETENTION TWE OW) duct that has high eonceritmons of PR And Some [JR Kaptan et at a pmdomunatnce of odd-numbered apiaries or pamffins The chromatogram in Figure 3b is mprrsentavve of a more mature product is FIGURE 4 which Cis to C2& alkanes predominate and GAS CHROMATOGRAM dLIISTRUMS CARBON DISTRIBUTION the PR and PH concencmuons are signifi- PATTERNS FOR J"v I(MOSENE, AND DIESEL cantly reduced. Table t idea aftes addtuonal parameters 3teference: I R Kaplan et al.,"Environ- 800 Roosevelt Road Bldg P.Suite 408.Glen that can be assessed to determine the ocwrk mental Forensic Geochemistry A Chemical Ellyn.IL 60137-5835.(709) 469-3373. at a of heavier petroleum products For example- System for Identifyutg Sources of Escaped cost of$110 as shown in Figtme 4,the carbon dnstrilittuoa Petroleum Products."Published in Proceed- pattern varies sigruticantly between three ings of HatMaf1Wesr '92 Available from similar fuels JP-5 kerosene,and diesel_ Tower Conference Management Company. `r `"` ELECTRICAL HEATING AND PLASMA-BASED DESTRUCTION MAY ENHANCE SOIL VAPOR EXTRACTION _ mproved extraction and destruttton of a packed-bed,high-energy corona reactor to encc,which was held August 23-27, 1992 in volatile. semivolaule. and even non- destroy contaminants in the vapor exn=on Boise.Idaho votatale compounds from contaminated offgas The technique presents a potential soils is the goal of technologies bang devel. low-energy, low-cost alternative to conven- �mitBt�oAg O� oped at DOE's Paci fic Northwest L.aborAwry tional liminal destruction or activated car- (PNL�Richland.Washington) The extrac- bon adsorption conventlonal Vapor tion technique.called electrical rernetiiaason Extraction at contaminated environments(ERACE),en- Developments in these two technologies hanccs convenuonal soil vapor extraction by we discussed in EngineennX Scaleup of In conventional soil vapor cxtr -tion. air heating the soil with an in situ electrical field Electrical Soil Heating for Soil Decontaint- inlets or injection welts are placed at the outer The computer modeling developed for the nation." by W O Heath et al., and "High- sdgcs of a contaminated area,and vapor ex- ERACE technique helps predict the egtup- EnCy Coma for Aestaicuon of Volaulc traction wells are planed at the center The mens and power mqutremenrs based on the Organic Contaminants in Process Off- extraction wells ate connected to the suction characteristics of the site Gases 'by I W Virden ct al The authors are side of a vacuum pump that induces the flow 0 with Battelle MemonalInstitute.which oper-- of air from the injection wells to the extrac- The destruction technique uses a low-tact- Ates M for rhe DOE. Both papers were non wells In addition to drawing vapors of perature.nonequilibrium plasma produced in presented at the SPECTRUM 192 Confer- volatile organic compounds(VOCs)into the The Hazardous Waste Consuiltant:March/April 1993 i.11