Method Abstract #52, Nitrate by ISE

Nitrate by ISE

Method Abstract #52

Scope and Application

This method is a variation of Standard Methods 4500-NO3 D.  It determines the concentration of nitrate ions in a water sample.

Method Summary

The concentration of nitrate is determined by a nitrate ion selective electrode. After calibrating with known standards, the sample’s response can be compared to the calibration curve and a concentration determined. Both the standards and the samples are pre-treated with ionic strength adjuster (ammonium sulfate) to ensure that the background response from each sample is similar.

Sample Calibration Curve

Method Performance

*Data for this measuring range was obtained using laboratory prepared standards formulated from potassium nitrate. The measuring range may be increased by using auto-dilution.

**The Method Detection Limit (MDL) was determined based on data obtaining a coefficient of variance better than 30%. Results may differ depending on laboratory practices and sample matrix.

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