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Methanol and Ethanol Analysis Mobile Geochemistry Inc purging

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Methanol and Ethanol Analysis Mobile Geochemistry Inc purging Powered By Docstoc
					Methanol and
Ethanol Analysis/
 The Ultimate Gourmet
         Martini


       J. Picker
          HP Labs
        Escondido, CA
        Objective
   Analyze methanol and ethanol
    at 100-1000 ug/L or lower
   Use standard or modified EPA
    Methods
   Provide adequate Turnaround
    and pricing to meet client
    needs
   Make a profit
            HP Labs
          Escondido, CA
         Warning
   Methanol is “wood alcohol”
    minimum lethal dose 1g/kg
    but toxic effects as low as
    10g.
    toxicity is due to metabolic
    production of formic acid
   Ethanol is less toxic
            HP Labs
          Escondido, CA
         Problems
   Very Poor purging efficiency (i.e.,
    NO 5030/5035)
   Allowed Prep. Techniques
     5031 Azeotropic distillation
     5032 Vacuum distillation

     5021 Equilibrium Headspace =nd

     5041 VOST train = nd

     Direct Inject


             HP Labs
           Escondido, CA
        Problems II
   Low sensitivity on FID and
    MS
   Interferences by HCs and
    other compounds on FID




            HP Labs
          Escondido, CA
HP Labs’ Solution
   Direct Aqueous injection/EPA
    Method 8260B
   GC Column and conditions to
    separate MeOH, EtOH from water
   Stable Labeled isotope internal
    standards (CD3OH,CD3CH2OH)
   Modified with Selected Ion
    Monitoring Mass Spectrometry
    (SIM)

            HP Labs
          Escondido, CA
  HP Labs
Escondido, CA
  HP Labs
Escondido, CA
  HP Labs
Escondido, CA
  HP Labs
Escondido, CA
Sample Preparation: water
         Sample Size 1 mL
         Add Labeled IS Solution
         Inject




                   HP Labs
                 Escondido, CA
Sample Preparation: Soil
         Ultrasonic extraction (EPA 3550)
          10 g/10 mL
         Remove 1mL
         Add IS
         Inject




                   HP Labs
                 Escondido, CA
Detection Limits
    Water and Soil

   MDLs < 100 ug/L (ug/kg)
   EQLs   250 ug/L (ug/kg)




           HP Labs
         Escondido, CA
What This Means
   Methanol and Ethanol on site or off
    site
   Rapid turnaround
   All levels of QC
   Price as low as fixed base




             HP Labs
           Escondido, CA

				
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posted:5/16/2011
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