What does the Amtax sc analyzer actually measure?

Document ID

Document ID TE1929

Version

Version 8.0

Status

Status Published

Published Date

Published Date 03/05/2019
Question
What does the Amtax sc analyzer actually measure?
Summary
Amtax sc Measurements
Answer
When the measurement is displayed on the Amtax sc, the units are "NH4-N" or "NH4", which means that the instrument measurement is expressed as ammonium and reports the values as Nitrogen (also described as "NH4 as N") or as Ammonium.

The Amtax sc analyzer adds Sodium Hydroxide (NaOH) to adjust the pH and convert ammonium ions (NH4+) to gaseous Ammonia (NH3) which passes through an Ammonia gas selective membrane and causes a pH shift of an electrolyte solution. This pH shift in the electrolyte is measured as a mV signal that is proportional to the concentration of Ammonia (NH3) in the sample.

(The Amtax sc can be configured to report as NH4 in the LOCATION1 (and/or LOCATION2 in a dual stream unit) SET PARAMETER to Ammonium (NH4) instead of Ammonium-Nitrogen (NH4-N)).

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