Methods are in Qi, H., Coplen, T.B., Geilmann, H., Brand, W.A., and Böhlke,
J.K., 2003, Two new organic reference materials for d13C and d15N
measurements and a new value for the d13C of of NBS 22 oil:  Rapid
Communications in Mass Spectrometry, v. 17, p. 2483-2487, which was
mentioned by Willi Brand earlier today.



                      Carolyn LK
                      Colonero                 To:       [log in to unmask]
                      <[log in to unmask]        cc:
                      >                        Subject:  Re: Carbonates via EA-IRMS
                      Sent by: Stable
                      Isotope
                      Geochemistry
                      <[log in to unmask]
                      UVM.EDU>


                      09/28/2004 11:39
                      AM
                      Please respond to
                      Stable Isotope
                      Geochemistry






Okay, I'm intrigued.  We have hundreds of carbonates waiting to be analyzed
but our Gas Bench is sketchy and our EA works great.  Using the EA for our
carbonates would speed things up tremendously!  Would anyone be willing to
share their method (temps, flow rate, any special equipment, or add-ons)
with me?  Does it vary greatly from standard EA-IRMS of organic materials?

Thanks!
Carolyn

At 11:15 AM 9/28/2004, you wrote:
>Bob
>
>Yes, works very well, at least for calcium carbonate. We get good d13C
>values (within better than 0.2 per mille of 'accepted' value) for NBS-18
>and -19 carbonates when compared with IAEA CH-7 (polyethylene) and NBS-22
>(oil) all run together under normal EA-IRMS conditions (Carlo Erba NA1500
>+ VG Triple Trap + VG Optima).
>
>Tim H.E. Heaton
>
>NERC Isotope Geosciences Laboratory
>British Geological Survey
>Keyworth, Nottingham NG12 5GG, England
>(www.bgs.ac.uk/nigl/index.htm)
>
>Tel. +44(0)115 936 3401
>Fax +44(0)115 936 3302
>E-mail: [log in to unmask]
>
>
>-----Original Message-----
>From: Stable Isotope Geochemistry [mailto:[log in to unmask]]On
>Behalf Of Robert F Dias
>Sent: Tuesday, September 28, 2004 3:45 PM
>To: [log in to unmask]
>Subject: [ISOGEOCHEM] Carbonates via EA-IRMS
>
>
>Folks,
>Myth or reality - Can CaCO3 be run for d13C via standard EA-IRMS methods?
>If so, what kind of accuracy and precision are readily obtained?
>I have an application where it would be advantageous to do so, but cannot
>recall if such analyses are possible, or just urban legend.
>
>thanks, Bob
>
>
>
>"Make three correct guesses consecutively and you will establish yourself
>as an expert"  (Ryan's Law)
>
>Dr. Robert F. Dias
>Assistant Professor
>Department of Chemistry and Biochemistry
>Old Dominion University
>Norfolk VA 23529
>ph (757) 683-4093
>fx (757) 683-4628
>
>
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~~~~~~~~~~~~~~~~~~~~~~~
Carolyn LK Colonero
E34-546
MIT/EAPS
42-44 Carleton Street
Cambridge, MA 02142
lab: 617-324-4002
office: 617-253-7850
~~~~~~~~~~~~~~~~~~~~~~~