Phil,
We currently measure 15N-nitrate in lysimeter water by
diffusing N from the solution onto acid traps and running
the traps on our Finnigan Delta Plus with a Conflo II
interface. We charge $15.60 per sample for the isotopic
analysis. If you have a quantity of samples, we could
negotiate the cost. Our turnaround time ranges from 2 to 6
weeks.
-Bill

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~
Bill Holmes, Research Associate
Terrestrial Ecosystem Laboratory
University of Michigan
School of Natural Resources and Environment
430 East University, Room G540
Ann Arbor, MI 48109-1115
[log in to unmask]   Office:(734)647-0459   Lab:
7-0469/7-0481
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~



----- Original Message -----
From: "Phil Richerson" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, February 01, 2001 11:06 AM
Subject: [ISOGEOCHEM] Looking for N isotope labs


> I am interested in assessing potential sources of elevated
nitrate
> concentrations in groundwater.  Therefore, I am looking
for analytical labs
> that perform nitrogen isotope analyses on water samples.
If subscribers
> know of such a lab, please let me know.  I need to find
out things like
> cost, turn around time, etc.
>
> Thanks,
> Phil Richerson
> Oregon DEQ
> (541) 278-4604
> (541) 278-0168 (fax)