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Subject:

Very positive 18O ir numbers vs CO reference tank

From:

"Mirzoian, Armen, PhD" <[log in to unmask]>

Reply To:

Stable Isotope Geochemistry <[log in to unmask]>

Date:

Fri, 9 Jun 2017 22:07:49 +0000

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Hello group:

I'm getting extremely positive and often inconsistent (400 and above) 18O ir numbers for ethanol measured against CO tank we purchased from Air Liquide. I'm using HTC that follows GC separation with the liquid injection. Unfortunately, I just started the 18O work and don't have much experience with evaluating where this problem can be coming from (poorly characterized reference CO tank or HTC dysfunction)? Air Liquide is claiming that  their tank 18O ir numbers are  very solid (+2.2 VSMOW). Any advice will be highly appreciated!

Armen

Armen Mirzoian, PhD
Beverage Alcohol Laboratory
Alcohol and Tobacco Tax and Trade Bureau (TTB)
6000 Ammendale Rd, Beltsville, MD 20705
Tel: (240) 264-1598
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