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GC_EV00688
Methyl tert-butyl ether-d3
MTBE
GC_EV00689
Rtx®-VMS, 30m, 0.25mm ID, 1.4µm (cat.# 19915)
Sample: custom
Inj. temp.: 250°C
Carrier gas: helium, constant flow
Flow rate: 1.3mL/min.
Dead time: 1.47min.@ 35°C
Oven temp.: 35°C (hold 7min.) to 90°C@
4°C/min.(no hold) to 220°C@
45°C/min. (hold 1min.).
Det: Agilent 5971AGC/MS
Transfer line temp.: 280°C
Scan range: 35-260 amu
Tune: PFTBA/BFB
Ionization: EI
Figure 4:
MTBE and internal standardmethyl-d3-tert -butyl ether share identification ion 73.
Conclusion
With an expanding target list and difficult samplematrixes, such as petroleum distillates, extreme caremust be taken, evenwithGC/MS,
to assure correct identification of oxygenates in the presence of interfering analytes. Under the conditions used here, anRtx®-VMS
column is suitable for analyzing low levels of oxygenates in the presence of other gasoline components. For additional information, see
reference 5.
References
1.C. English, C. Cox, F. Dorman, D. Patwardhan, TheAnalysis of GasolineOxygenatesUsing aNewCapillaryColumn StationaryPhase,
PittsburghConference 2001, Session 199 (poster).
http://www.restekcorp.com/2001/1868P.pdf
2.Happel,A.M., E.H. Beckenbach, R.U. Halden, AnEvaluation ofMTBE Impacts toCaliforniaGroundwater Resources Lawrence
LivermoreNational Laboratory, UCRL-AR-130897 (1988).
http://www-erd.llnl.gov/mtbe/pdf/mtbe.pdf
3.U.S. Environmental ProtectionAgency, VolatileOrganicCompounds byGasChromatography/Mass Spectroscopy (GC/MS): Capillary
ColumnTechniqueMethod 8260. Revision 0, July 1992, USEPAOffice of SolidWaste.Washington, D.C.
4.U.S. Environmental ProtectionAgency, VolatileOrganicCompounds byGasChromatography/Mass Spectroscopy (GC/MS): Capillary
ColumnTechniqueMethod 8260B. Revision 2, December 1996, USEPAOffice of SolidWaste.Washington, D.C.
5.C.M. English, F.L. Dorman, G.B. Stidsen, TheAnalysis of GasolineOxygenates byEPAMethod 8260B PittsburghConference 2003,
Session 590-6P (poster).
http://www.restekcorp/pittcon2003.htm#slides
Acknowledgement
We are grateful toO.I. Analytical for supplying the purge and trap unit used in this study, and for their helpwith establishing
analytical conditions.