Cyndi,

In my experience H2SO4 never gets through the chemical traps on the C/N
analyzer.

Paul.



At 12:14 PM 9/23/99 -0600, you wrote:
>What about the concern of what the H2SO4 will do to the mass spec?  Does the
>CF of He sufficiently sweep the acid away to the pumps and prevent any
>corrosive reactions from occurring?   Or does the acid not make it past the
>combustion tube?
>
>Cyndi
>
>**************************************************************
>Cyndi Kester
>U.S. Geological Survey
>Denver Federal Center, Bldg. 21, MS 963
>Denver, Colorado 80225
>
>office:  303-236-0278
>lab:     303-236-7694
>fax:     303-236-4930
>email:   [log in to unmask]
>
>
>----------
>>From: Bill Showers <[log in to unmask]>
>>To: [log in to unmask]
>>Subject: Atm Deposition Samples
>>Date: Thu, Sep 23, 1999, 7:37 AM
>>
>
>> Dear Listmembers,
>>
>> I am trying to analyze some atm NH4 samples for N-15 that were collected in
>> denuders and washed out of the collector with sulfuric acid.  NH4 samples
>> in HCl freeze-dry nicely, can be rehydraded with a drop of RO water and
>> placed on chemsorb particles for analysis in a EA-CFIRMS.  Does anyone have
>> a technique for analyzing NH4 samples trapped in sulfuric acid?  What
>> happens if you inject conc sulfuric acid into the EA combustion column?
>>
>> Thanks for any help.
>>
>> Bill Showers
>> ----------------------------------------------------------
>> William J. Showers
>> Associate Professor
>> Dept. of Marine, Earth, & Atm Sciences
>> North Carolina State University
>>
>> (919) 515-7143 - voice
>> (919) 515-7802 - fax
>> [log in to unmask] - email
>
>



Paul D. Brooks.

Dept. ESPM-Ecosystem Sci.,
151 Hilgard Hall, MC 3110,
UC Berkeley, Ca. 94720-3110.

phone (510)642-3155
FAX   (510)643-5098 (to Att. Paul Brooks)