This Web-site is organized into five sections:

Section I: Described here is a brief overview of the method and its utility. In this overview, two methods are discussed. Method I (Chang et al., 1999), which is suited for samples with nitrate concentrations between 1-20 mM (the Cat AG2X method), and Method II (Silva et al., 2000) which is best suited for samples with higher nitrate concentrations (the AG1X method). 

Section II: Describes how to collect the sample using either the AG1X (Method I) or Cat AG2X (Method II) approach. If your sample nitrate concentrations span a large range, then you may have to use both of the Method I and Method II collection approaches. 

Section III: The recovery section describes how to recover and process the samples in the laboratory. 

Section IV: Here is an example of a sample analysis spreadsheet as well as a link for a blank sample analysis spreadsheet. 

Section V: This is a poster which depicts the procedure for the Cat AG2X method (Method II).
 

Acknowledgement:
This Web page was conceived by Cecily C.Y. Chang, produced by Carla Chamberlain and Daniel Steinitz.

The URL of this page is: http://wwwrcamnl.wr.usgs.gov/isoig/guidelines/nitrate/index.html
Page created by Carla Chamberlain, Daniel Steinitz and Cecily Chang.
Please contact Carol Kendall (ckendall@usgs.gov) for questions and comments regarding this page.
This page was last changed on July 19,  2001.
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