Here's a link to a USGS stable isotope lab doing N-15 and O-18 analyses using
a bacterial method we've developed here at Princeton. It's a very reliable
method and simpler than current methods out there, i.e. silver nitrate
analysis, etc. Last I heard, this USGS lab was charging around $250 U.S. per
sample. Ty Coplen would be a contact to get hold of there.
Rick Carlson wrote:
> Dear list members, The Idaho State Department of Agriculture has been
> conducting N-15 and O-18 nitrate testing of ground water for the past
> several years to evaluate areas in Idaho having high ground water nitrate.
> Typically, the samples contain nitrate levels ranging from 5 mg/L to 40
> mg/L. Unfortunately, the lab we have been using is no longer able to test
> our samples do to budget constraints and a staffing shortfall. Currently,
> we have ~ 200 samples stored in our freezer that need to be analyzed. Are
> any of the Isogeoochem list members associated with a lab that would be
> able to test these samples. If so, what would be the cost.
> Rick A Carlson
> Ground Water Program Manager
> Idaho Department of Agriculture
> 2270 Old Penitentiary Road
> Boise, Idaho 83712