May I add to the 15N by IR question an additional request along the the same
instrumentation line:

I have read several articles so far regarding the use of FTIR for the
determination of D/H isotope ratio in Total Body Water analysis (using high
D2O doses in animal species to start with). Some of those articles did a
direct comparison with IRMS showing good agreement in results.

Does any of the list members have direct experience with the above that they
can elaborate on?


Nabil Saad
Kinemed, Inc

On Jan 15, 2008 4:48 AM, Rafael Nú?ez Gómez <[log in to unmask]>

>  Dear list members
> I have been asked about the possibility of using IR Spectroscopy (the
> exact model is Fischer FAN) for 15N analysis in urea and ammonium. I knew
> about 13C but never heard about 15N.
> Thanks
> Rafael