I am beginning an experiment involving the addition of 18O enriched
nitrate to soil taken from a red pine forest in Massachusetts, I will
be performing the experiment and running the samples on the mass spec
myself.  I am having difficulty finding numbers for the natural
abundance of 18O in the O horizon of forest soils to judge the validity
of results returned from unlabeled soils, and was hoping that someone
on the list might have experience in this area and know a range of
values I might expect to see?  I was also hoping someone might be able
to suggest standards to run with the soil?  Right now all the lab has
is standardized sucrose, with a delta 18O at about 36 per mil.  My
thanks for your time and any help you can offer.

 Rich MacLean


 
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