Hi Yanhua,
You need to do the peak jump between C and N analyses (the technical manual should explain how to do this). Also, you need to purchase a dilutor to dilute the CO2. The reason is that normally samples have much more C than N. If you don't do sothe IRMS will be saturated with C signals. Alternative way is to do them separately if you don't have grant to buy the dilutor right now.
River He
--- On Fri, 11/6/09, Yanhua Feng <[log in to unmask]> wrote:
> From: Yanhua Feng <[log in to unmask]>
> Subject: [ISOGEOCHEM] IsoPrime EA-IRMS N2 measurement
> To: [log in to unmask]
> Received: Friday, November 6, 2009, 1:13 PM
> Dear all,
> We have an IsoPrime isotope ratio mass
> spectrometer. an EuroVector 3024
> elemental analyzer is hooked up to it. the EA is configured
> for Carbon &
> Nitrogen analysis. the software is MassLynx 4.0i.
> Carbon analysis for percentage and delta 13C
> is our routine.
> We never done Nirtogen before.
> I am looking for a procedure for measuring C
> & N in one or separate
> analysis, I am hesitated about how to modify " EA NC run "
> or "EA NC diluter"
> method, cycle the magnet, when to open RN and when to open
> RG, how much
> pressure set for RN.
> any suggestion or clue would be appreciated.
>
>
> Yanhua Feng
>
> Plant & Environmental Sciences
> New Mexico State University
> Las Cruces, NM 88003
>
__________________________________________________________________
Be smarter than spam. See how smart SpamGuard is at giving junk email the boot with the All-new Yahoo! Mail. Click on Options in Mail and switch to New Mail today or register for free at http://mail.yahoo.ca