Dear Peter:

For methods check (among others):
Silva et al. (2000) A new method for collection of nitrate from fresh water
and the analysis of nitrogen and oxygen isotope ratios. J. Hydrol. 228,
22-36.
Revesz et al. (1997) Determination of d18O and d15N in nitrate. Anal. Chem.
69, 4375-4380.

A good overview of potential and limitations of using oxygen isotope ratios
of nitrate for determining the origin of nitrate and nitrogen
transformations is given by Kendall, C. (1998) Tracing nitrogen sources and
cycling in catchments. In: Isotope Tracers in Catchment Hydrology (eds. C.
Kendall and J. J. McDonnell), pp. 521-576. Elsevier.

Cheers,

Bernhard

Bernhard Mayer
Stable Isotope Laboratory
University of Calgary
Calgary, Alberta, Canada T2N 1N4

-----Original Message-----
From:   Peter Vervloedt [SMTP:[log in to unmask]]
Sent:   Wednesday, August 30, 2000 3:28 AM
To:     [log in to unmask]
Subject:        18O in nitrate - references wanted

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