Dear Eleazar ,
Your high d15N values are probably due to contamination
from CO (More 13C than 15N). We have been analyzing N2
gas from volcanoes routinely using a continuous flow
method. This allows us to separate N2 from other gases.
See Subduction and Recycling of Nitrogen Along the Central
American Margin, Science 297, 1154 (2002);
I have several related papers online at
http://epswww.unm.edu/facstaff/zsharp/homepage/hompage-v6_website/publications.html
Good luck,
Zach
On Thu, 16 Jun 2011 07:48:03 -0700
John Eiler <[log in to unmask]> wrote:
> Perhaps I misunderstand your post, but from your
>description it sounds like your samples and standards
>might differ greatly in chemical composition (i.e., O2,
>H2O, Ar, etc.). If so, they would undergo significantly
>fractionations in the source, and might be subject to
> different sorts of isobaric interferences. Have you made
>measurements in which both sample and standard are
>purified N2?
>
> John
>
> On Jun 16, 2011, at 7:29 AM, Eleazar Padrón wrote:
>
>> Dear colleagues,
>>
>> I am starting the analysis of 15N/14N ratio measurements
>>on volcanic gases by means of Thermo MAT 253. I would
>>like to receive some advices about the use of Dual Inlet
>>system to make this type of analysis. I have used
>>atmospheric air as standard, but the results I am
>>obtaining are much heavier than expected. The sample is
>>taken in a evacuated bottle where a 5N NaOH solution
>>retain the CO2 of the volcanic gas.
>> Can anybody help me on this?
>>
>> Thank you
>>
>> Eleazar
>>
>> __________________________________________________________________________________________________
>>
>> Eleazar Padrón González
>> Instituto Tecnológico y de Energà as Renovables, S.A.
>>(ITER, S.A.)
>> Polà gono Industrial de Granadilla, s/n 38600 -
>>Granadilla de Abona Santa Cruz de Tenerife - España
>>(Spain)
>> TEL: + 34 922-747-700; FAX: +34 922-747-701
>>
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