RE: air monitoring w/bubblers

[Wes <vanpelt@ios.com>]

Greetings Glen and All,

When I was RSO at Roche/Nutley I developed what we called the Universal Air Sampler.  This was about 1975.  

Particulate C-14 came out on a membrane filter.  Non-particulate C-14 passed thru a furnace with an oxidizing catalyst.  The resulting CO2 was trapped in a bubbler.  I do not remember if we separated volatile C-14 (e.g., labelled organic solvent) from CO2.

I believe the system is still being used.  Contact Mike Drzyzga at Roche for current status.

Cheers, Wes Van Pelt

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From: 	Glenn Sturchio[SMTP:glenn_sturchio@merck.com]
Sent: 	Tuesday, September 26, 1995 12:27 AM
To: 	Multiple recipients of list
Subject: 	air monitoring w/bubblers


Greetings:

We have installed EG&G EL 700 air monitoring systems.  The basic idea is 
that tritium oxides and compounds travel through an initial set of bubblers, 
a furnace (w/catalyst), and a second set of bubblers.  The bubblers are full 
of ethylene glycol and trap 99.9% of the oxide.  The furnace converts 
everything to oxide.  Therefore, the first set o' bubblers integrates the 
oxide and the second set integrates the not-oxide.  Fairly straightforward 
for tritium.

Our question:  Does anyone have experience (or hints) on using bubblers for 
C-14 compounds other than CO2?  We're currently using ethanolamine.  How 
about S-35?

We intend to run some bench top experiments, but any additional guidance 
would be appreciated.

Thank you,
Glenn Sturchio
glenn_sturchio@merck.com
908-594-6267