Hi Anthony--

The heater on our Supelco high purity gas purifier only gets to ~500 oC, 
so you may need to find a proper tube furnace (used on LabX?), 
thermoline or mighty might.  There are other GC gas purifiers (remove O2 
from He, N2, Ar, etc. at RT--see restek, alltech, supelco, etc.), but my 
guess is they'll broaden your peak too much in their current 
configurations for hooking inline with the gasbench. 

How much O2 are you looking at, and would a GCC type tube furnace (1/16" 
alumina tube packed with copper wire) work connected just before GC 
column? 

Have fun...

take care

gerry

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Anthony Aufdenkampe wrote:
> We're setting up a Gasbench method to analyze the mass 28 to mass 40 
> ratio in dissolved gasses to investigate denitrification.  The 
> required precision needs to be <0.2%, so we need to remove O2 while 
> filling the injection loop to eliminate variability in the ionization 
> efficiency due to variable O2 concentrations (as demonstrated by 
> Emerson et al. 1999, Marine Chem 64, p 337, Fig 3) .  We're looking 
> for advice on how to do this on a small volume gas sample.
>  
> One option is to pass the sample through a column of Cu heated to 600 
> C.  However, we would need a small furnace to hold a relatively small 
> quartz tube (around 1 x 10 cm).  Can anyone suggest a supplier for 
> such a diminutive furnace?
>  
> Also, are there other methods to remove oxygen that operate at room 
> temperature.  We would need a reagent with a reasonably high capacity 
> for O2, as we would be running 200-500 mL of air through a relatively 
> small volume (5-10 cc) column for each sample batch.
>  
> Any and all ideas would be much appreciated.
> Cheers,
> Anthony
>  
> _____________________________________________________________________
> Anthony K. Aufdenkampe, Ph.D.
> Assistant Research Scientist - Isotope & Organic Geochemistry
> Stroud Water Research Center
> 970 Spencer Road
> Avondale, PA 19311
> Tel:  610-268-2153 ext. 263
> Fax   610-268-0490
> http://www.stroudcenter.org/about/aufdenkampe.htm
>