HI All--

The CO per mil values may be region specific--our GTS (Merriam Graves 
supplier) tank is -240 per mil vs vsmow for oxygen, same ballpark as the 
Spectra Gases.  We've ranged from -150 to -300 on the tanks. 

take care

gerry

p.s. you may also have to pay to ship the tanks back



Anthony L. Michaud wrote:
> Paul,
>
> We got our CO from Air Liquide. It was about $1100 for 175cfm of the
> research grade gas. Last I heard Air Liquide had bought Messrs Grisheim (I
> don't remember how to spell it, sorry) whom I believe is the same supplier
> for GTS.
>
> Note: Air Liquide took about 3 months to get the tank to us.
>
> Isotope ratios for our tank of CO are around -3.5 permil vs VSMOW for
> oxygen.
>
> Anthony
>
>
> ------------------------------------------------------
> Anthony L. Michaud
> KFLEB
> School of Earth and Space Exploration
> Arizona State University
> Tempe, AZ 85287-1404
>  
> Tel: 480-727-8033
> Fax: 480-965-8102
> Web: http://kfleb.asu.edu
>  
> ***Windsurf Everywhere***
> ------------------------------------------------------
>  
>
> -----Original Message-----
> From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf
> Of Paul Brooks
> Sent: Monday, April 23, 2007 1:48 PM
> To: [log in to unmask]
> Subject: [ISOGEOCHEM] N. American CO ref gas
>
> Anyone who can help,
>
> I am just re-ordering at ref gas tank of CO form GTS in the USA, and they 
> are now charging US$615 and UD$285 for the tank plus shipping, or about 
> US$1000 for a tank.  Has anyone found another supplier in N. America with 
> CO at a reasonable isotope ratio for organic sample analysis?
>
> Thanks in advance, Paul Brooks.
>
>
>
>
>
>
>
> Center for Stable Isotope Biogeochemistry
> Valley Life Science Building Room 3060
> Integrative Biology - MC3140
> Berkeley CA-94720
> Phone: (510)-643-1748
> Fax: (510)-643-1749 
>
>