Stable Isotope Geochemistry


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gerard olack <[log in to unmask]>
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Stable Isotope Geochemistry <[log in to unmask]>
Wed, 20 Jul 2016 17:56:00 -0500
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HI Million--

Assuming you're running in the normal config and not the single path set 

You can pile the glassy C chips on the bottom up a  little higher, a cm 
or so--but stay out of the hot zone.  If the top of the glassy C tube 
clears the hot zone and the crucible goes down a few cm, you should be ok.

The graphite funnel on top of the glassy C tube should be out of the hot 
zone too--so minimal contact with the walls.  I haven't tried shaving a 
bit off the outside of the bottom half of the graphite funnel to keep it 
from the alumina walls--but if you're getting too close to the hot zone...

Test it out.  If it's cracked in half, the classy C tube may not fully 
span the hot zone and you may end up with high backgrounds and reactions 
between glassy C and wall--esp. if you run at 1450+ oC.

Single path set up--you're probably out of luck.  You need single tube 
from the bottom adapter thru the hot zone and crucible position.  If the 
crucible is a few cm into the glassy C tube--it may work.   (No luck if 
it was a glassy C tube for water injections).

IF the ends are jagged--you can probably live with that.  Point them up 
and have the funnel sit on top of them.  The funnel should guide the 
sample into the tube--and that's all you need to worry about.  But 
double check it when test samples drop (and you have a good pair of shades).

take care,


On 7/20/2016 4:15 PM, Million Hailemichael wrote:
> Hi everyone,
> Is there any way to repair and reuse a broken glassy carbon reactor 
> for TC-EA reverse flow system? The ceramic tube and the glassy carbon 
> came out pretty fine from the furnace. I left the glassy carbon tube 
> on a working bench for few days; and when i tried to clean it, it 
> broke into two halves. Any advice how to repair, maintain and reuse it 
> again.
> Thank you
> Million