I had problems with a Nafion trap attached to a TICTOC (total
inorganic carbon/total organic carbon analyzer) when I analyzed
seawater samples. Apparently the Cl given off by reacting the sample
with phosphoric acid and Na persulphate caused the nafion trap to
become permeable to carbon dioxide and as a result my yields were much
too low. I've never heard of this happening with the Gasbench, but it
is not outside of the helm of possibility. Something to keep in mind.
On Jun 16, 2008, at 9:48 AM, Gerard Olack wrote:
> HI All--
> The Isogeochem wiki also has a short write up concerning cleaning: http://isogeochem.wikispaces.com/repair+tips#nafion
> with links to Permapure.
> take care
> Paul Eby wrote:
>> Be cautious with heating: I've done that and degraded the Nafion to
>> the point that it had to be replaced....
>> Paul Eby
>> University of Victoria
>> At 09:05 AM 16/06/2008, you wrote:
>>> I believe Nafion traps are fairly robust and don't "break down".
>>> Certainly material could flow through them that would degrade
>>> them. If you suspect the ability for it to remove water, you might
>>> try lightly heating it while helium is flowing...you will
>>> typically get a fair bit of water off. Perhaps you had a wet
>>> helium cylinder? Are you detecting a leak? I have had bad luck
>>> with the base of the sample open split that seems to begin leaking
>>> after thousands of samples.
>>> Andrew Schauer
>>> Department of Earth and Space Sciences
>>> University of Washington
>>> Seattle, WA 98195
>>> [log in to unmask]
>>> ----- Original Message ----
>>> From: Joe Lambert <[log in to unmask]>
>>> To: [log in to unmask]
>>> Sent: Monday, June 16, 2008 7:21:24 AM
>>> Subject: [ISOGEOCHEM] Gasbench Nafion Traps
>>> Hi everyone,
>>> I was hoping to get some advice regarding the two Nafion
>>> water traps
>>> in Thermo's Gasbench. Can anyone please explain the symptoms of a
>>> trap that is no longer functional? I'm assuming the trap directly
>>> after the
>>> sample needle is typically the first to go. Is there a way to
>>> test which
>>> trap has the problem? Finally, what is the expected life of
>>> Nafion traps?
>>> We've had about 7,000 samples through the machine with only a few
>>> being water samples.
>>> Thanks in advance,
>>> Joe Lambert
>>> Alabama Stable Isotope Laboratory
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Assistant Professor (Senior Research)
College of Oceanic and Atmospheric Sciences
Oregon State University
104 COAS Admin. Building
Corvallis, OR 97331
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