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Stable Isotope Geochemistry

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Subject:
From:
Toti Larson <[log in to unmask]>
Reply To:
Stable Isotope Geochemistry <[log in to unmask]>
Date:
Mon, 6 Mar 2006 17:21:49 -0700
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Folks,

I want to have a quadrupole MS and a IRMS-combustion interface plumbed to 
the same GC (its an Agilent 6890 with a 5975 MS). Both interfaces want to 
be connected through the left side of the GC, and the quadrupole HAS to be 
joined right up next the the GC. GV set it up so that there is approx. 
12inches between the GC and the 850C combustion furnace, and the part of 
quartz tubing along that length is heated to 350C. With the quadrupole in 
place there is no access to the entire left panel of the GC.

As far as I see it I can either:

1) have the GC column exit the GC somewhere that I am not sure of and run a 
capillary a distance of ~0.5 meters prior to connecting up with the 
combustion interface. There will be GC capillary cooling issues if I take 
this route

2) plumb the combustion interface to the right of the GC. Although it will 
go through a circuit board it appears that Agilent put a hole in the 
circuit board for ideas like this. This may also be a bad idea because my 
IRMS is off the left of the GC so I will need approx 6' of capillary to 
connect the combustion interfacec to the IRMS

3) wait until somebody on ISOGEOCHEM has a much better idea

Thanks,
Toti.
  

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