A big problem with NO is that in an air environment it is in equilibrium
with NO2. NO2 is so reactive that it sticks or reacts to most compounds
and is very difficult to work with. About 20 years ago I attempted to
trap NO/NO2 flux from a soil using, as I recall, a small potassium
permanganate trap, then analyzing the potassium permanganate but putting
it in a tin capsule and analyzing by EA-IRMS. It required a long
trapping time to acheive even a few ugN for analysis. This might have
worked for enriched N, but the researchers involved decided not to
proceed. A better way might be to trap the NO/NO2 chemically then
somehow convert to N2O as you suggest. I recall that the NO was
actually trapped as NO2 so it might be then possible to convert the NO2
to N2O, particularly if the NO2 is in an aqueous nitrite form. I recall
a method for converting nitrite in seawater to N2O, but do not have the
Hope this is of some help. Paul Brooks.
On 3/20/2013 10:11 AM, BROWN, TODD M (AG/1005) wrote:
> If you convert to N2O won't you lose your 18O signature?
> Todd Brown
> 700 Chesterfield Pkwy
> Chesterfield MO 63017
> Office 636 737-6397
> FAX 636 737-4844
> -----Original Message-----
> From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Dyckmans, Jens
> Sent: Wednesday, March 20, 2013 3:08 AM
> To: [log in to unmask]
> Subject: [ISOGEOCHEM] AW: [ISOGEOCHEM] Nitric Oxide analysis
> Dear Aaron,
> we have made some attempts to measure NO in continuous flow IRMS and what we learned is that you do not want to have NO in your machine as it is very sticky and a pain to purge from your system. I strongly recommend you convert your NO to something nicer like N2O.
> Von: Stable Isotope Geochemistry [mailto:[log in to unmask]] Im Auftrag von Aaron Shultis
> Gesendet: Dienstag, 19. März 2013 19:06
> An: [log in to unmask]
> Betreff: [ISOGEOCHEM] Nitric Oxide analysis
> Does anyone out there run NO for 18O and if so are there any pitfalls I should look out for?
> I can not seem to find anything recent on the interwebs. Should I convert the NO to something easier like N2O???
> I would be analyzing pure gas on an Isoprime dual inlet.
Mr. Paul D. Brooks, Spectroscopist,
Dept. Integrative Biology MC3140
1005 Valley Live Sceince Building,
UC Berkeley, CA 94720-3140.
[log in to unmask]