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S ectrum Laboratones Chemical Fact Sheet-Cas 4 1634044 http l/wwti,speclab com/compound/e1634044 1 Chemical Fact Sheet ' Chemical Abstract Number '1634044 {CAS #� ; Synonyms MTBE i µ-Analytical Nl eliod - ;EYA Method 524 2 Molecular Formula C5H120 1octaiie600sterni g soline Manufaaa e o isabutene Unleadet gasolyne usizall}r ' ' Use ;contains additives for octane improvement includmg methyl tert-butyl ether $ l(MTBE) f _ ----- _ -- - - - ,Ga.solineoctane coniponeist,�0(#°10 CHEMICALPIZ�FILE Methyl reit-butyl ether i Consumption Pattei ns Demand 1988 65,500 barrels per day, 1989 72,500 barrels per day, 1993 ipiojected/ 90,000 barrels per day(average daily consumption, foreign trade is Inegiigible-) s - - --Apparent C616i Boiling Point - ;55 22 DEG-C __ __ _ _-- -------- - -----_ _� ___----- -- -- - -- r- — Melting Point i _ - Iv�olecuiar 'Weight' X88 15-- 10 - Densiity ;0 7405 g 2415EG 04 DEGC t-Butyl methyl ether may be released as a result of its use as an octane booster for unleaded gasoline acid its use in the manufacture of isobutene If t-butyl methyl ether is released to soil,itwill be subject to volatilization It will be expected to exhibit ;very high mobility in soil and,therefore, it may leach to groundwater It will not be expected to hydrolyze in soil If t-butyl methyl ether is released to water, it will not ' be expected to significantly adsorb to sedinient or suspended particulate matter, �bioconcentrate rim aquatic organisms,hydrolyze,duectly photolyze, or photcoxidize ; ' ;via reaction with photochemically produced hydroxyl radicals in the water,based ,upon estimated physical-chemical properties or analogies to other structurally related aliphatic ethers t-Butyl methyl ether in surface water will be subject to rapid Ivolatrlization with estimated half-lives of 4 1 lir and 2 0 days for volatilization from ' Envii onmental Impact la river one metes deep flowing 1 m/sec with a wind velocity of 3 m/sec and a model pond,respectively It may be resistent to biodegradation in environmental media ;based upon screening test data from a study using activated sludge naocula Many t ethers are known to be resistant to biodegradation If t-butyl methyl ether is released ' ;to the atmosphere,it will be expected to exist almost entirely m the vapor phase �bascd on its vapor pressure It will be susceptible to photoxidation via vapor phase 'reaction with photochemically produced hydroxyl radicals with an estimated ' ihalf--life of 5 6 days for this process Direct photolysis will not be an important removal process since aliphatic ethers do not adsorb light at wavelenghts X290 nm The most probable route of general population exposure to t-butyl methyl ether is ' ;probably via inhalation of contaminated air Exposures through demal contact may !occur in occupational settings t -- �� --- � -'-- _ (TERRESTRIAL TATE I�t�iiiyl,melt iyl ether�s releasees socl,it will be subject~ Ito volatilization based upon a reported Hemy's Law constant of 5 87X10-4 atin-cu ` In-lmole and vapor pressure of 249 tim Hg at 25 deg C It will be expected to f [exhibit very high mobility(5,SRC)in soil and,therefore,it may leach to 1 1 of 2 06/10/2003 4 08