The delta-18O values of IAEA-601 and IAEA-602 were determined using on-line
methods (MPI Jena) and off-line
methods (Indiana University). The delta-18O values stated are averages
determined from both methods:
IAEA-601: +23.3 permil vs VSMOW
IAEA-602: +71.4 permil vs VSMOW
You can download the full IAEA catalog at
If you've doubts regarding to PDB and SMOW standardisation, IAEA-tecdoc-825
document could clarify these:
Hope this help.
University of Parma.
----- Original Message -----
From: "Francesca Serra" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, October 04, 2005 1:15 PM
Subject: [ISOGEOCHEM] 18O vs. SMOW or vs. PDB?
> Recently I have been puzzled trying to understand what was the zero scale
> value of some reference materials commonly used for 18O analysis.
> According to Items 011796 Gerard Olack, Item 011666-009992 and 009492 by
> Willi Brand (and related items on Isogeochem historical record), the new
> benzoic acids IAEA-601 and 602 are vs. SMOW. But surfing the internet I
> have found that the values were vs. PDB.
> At present I am outside my office and I cannot check the IAEA catalogue,
> but I have been told that the general list of IR products does not specify
> if the value is against SMOW or PDB.
> In older time there was the golden rule that water has to be reported
> SMOW and rocks and carbonates against PDB. But what about new
> where the two "fields" might converge? Is ther any attempt to unify all
> Francesca Serra