Dear listmembers,

from next year on we want to start on-line water analysis (delta18O, 
deltaD) with a TC/EA (equipped with a liquid autosampler) coupled to a 
MAT 253.
We know the publication of Gehre et al. (2004) about continous flow 
analysis of water sample but we would like to get in contact with people 
who already use this method successfully.
At the moment we are discussing intensively how to do the calibration of 
the system with SMOW, SLAP and GISP and how to store these reference 
materials after the ampule has been opened: Is it better to store it in 
a large bottle or vial (25 ml, glas or plastic?) and to reopen this 
bottle regularly for calibration checks or should we split the water in 
for example 1 ml portions and store it in very small vials?
How often do you check your system with these RMs?
How many secondary standards do you use, what?s the difference in their 
isotopic composition and how did you produce them?
Probably a lot of questions will rise during the next months and we will 
be glad about any information, literature or warnings....

Thanks in advance and have a nice day

Ulrike Schulte



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Dr. Ulrike Schulte
Institut für Geologie, Mineralogie und Geophysik
Lehrstuhl für Sediment- und Isotopengeologie
Ruhr-Universität Bochum
Universitätsstr. 150

D-44801 Bochum

Tel.: 0234/32-25454
Fax.: 0234/32-14571
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