How long will primary IAEA standards last if we use them every day?

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
Email: [log in to unmask]



-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]]On
Behalf Of Anthony M. Faiia
Sent: 06 July 2005 15:17
To: [log in to unmask]
Subject: Re: [ISOGEOCHEM] Further Discussion on Carbonate Corrections


--- You wrote:
How about analyzing two, known but very different isotopic composition of
carbonates (NBS-18 and NBS_19) determining the slope and additive
correction every day and forget about calibrating the reference gas.  That
is what we did Revesz-Landwehr 2002;  RCM, 16: 2102-2114.
--- end of quote ---

That is the procedure we use as well. Ideally the samples will fall between the two standard values.

Anthony Faiia
Dartmouth College


*********************************************************************
This e-mail message, and any files transmitted with it, are
confidential and intended solely for the use of the addressee.
However, the information contained in this e-mail may subsequently
be subject to public disclosure under the Freedom of Information Act 2000 and, unless the information is legally exempt from disclosure, the
confidentiality of this e-mail and your reply cannot be guaranteed. If
this message was not addressed to you, you have received it in error
and any copying, distribution or other use of any part of it is
strictly prohibited. Any views or opinions presented are solely those
of the sender and do not necessarily represent those of the British
Geological Survey. The security of e-mail communication cannot be
guaranteed and the BGS accepts no liability for claims arising as a
result of the use of this medium to transmit messages from or to the
BGS.                               http://www.bgs.ac.uk
*********************************************************************