Dave,

there's another publication dealing with the measurement of d18O-values in
organic substances from J. Koziet: J. Mass Spectrom. 32 (1997), pp 103-108.
He is working with a glassy carbon pyrolysis tube at a relatively high
temperature (1200°C, if I remember correctly) and so he has to protect this
tube from contact with air. This means that his system is a little bit more
complicated to build up, but might offer a higher variability as compared
to our system (Werner et al., 1996), which is quite easy to construct. It
works perfectly well for most organic substances.
If you have any more questions or if you find some unexpected problems you
can also contact me directly via e-mail: [log in to unmask] (I'm no
subscriber to the Isogeochem, but can use the mailbox of my collegue M.
Gehre for this purpose)

Best regards

Barbara Kornexl



Barbara Kornexl
UFZ Umweltforschungszentrum Leipzig-Halle GmbH
Permoserstr. 15
D-04318 Leipzig
Tel.: 0049/341/235-2252