Depending on make and version of EA-IRMS software, it is possible to run any sample within a batch run with its own individually customized EA / IRMS method. This way one can run both samples with O2 pulse and samples without O2 pulse without having to compromise on a one-fits-all method that uses a shorter or smaller O2 pulse.
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of John Howa
Sent: 10 March 2015 19:24
To: [log in to unmask]
Subject: Re: [ISOGEOCHEM] IAEA-N3
I can confirm that our lab has observed the same phenomenon with oxidized nitrogen; we have seen a definite pattern in variability in various reduction reactor conditions. In case you were wondering if the "no oxygen pulse" (Gentile) method mentioned by Wolfram works, I can confirm that we've tested that as well with excellent results. Unfortunately, you will need oxygen to analyze the glutamic acid, if that's what you need to do. If your EA has the option for a smaller pulse of oxygen, that may also do the trick while preserving the ability to measure reduced nitrogen as well as d13C.
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