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Methanol and Ethanol Analysis/

Methanol and Ethanol Analysis/. J. Picker. The Ultimate Gourmet Martini. 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.

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Methanol and Ethanol Analysis/

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  1. Methanol and Ethanol Analysis/ J.Picker The Ultimate Gourmet Martini HP Labs Escondido, CA

  2. 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

  3. 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

  4. 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

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

  6. 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

  7. HP Labs Escondido, CA

  8. HP Labs Escondido, CA

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

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

  13. Detection LimitsWater and Soil • MDLs < 100 ug/L (ug/kg) • EQLs 250 ug/L (ug/kg) HP Labs Escondido, CA

  14. 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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