Pt 1541 Ammonium/Ammonia Electrode; Ammonium Calibration Solution Preparation - palintest Macro 900 Operation Manual

Macro 900 Operation Manual

16.4. PT 1541 Ammonium/Ammonia Electrode

Ammonium (NH
4
using the optional PT 1541 Ammonium/Ammonia electrode within pH 5 – 8
range.
The Ammonium ISE electrode will suffer interference from Potassium, Sodium
and Magnesium ions, which are similar in nature.
16.4.1.

Ammonium Calibration Solution Preparation

When an Ammonium ISE electrode is first installed, it must be calibrated at
three points. In order to achieve this, three batches of Ammonium calibration
solution must be prepared.
The solutions required are two 200mL batches of Ammonium (as NH
concentration of 10ppm and one 250mL batch of Ammonium (as NH
concentration of 100ppm.
The three calibration solutions should be freshly prepared by serial dilution from
1000ppm calibration
recommended:
Be sure to handle chemicals with care and to read and comply with all
health and safety advice.
Preparing the 100ppm solution
250mL of 100ppm solution is required. To prepare this, mix 25mL of 1000ppm
calibration standard with 225mL of deionised water.
Dispense 200mL of the 100ppm solution into a calibration bottle and retain
50mL for preparation of the 10ppm solution.
Preparing the 10ppm solution
A total of 400mL of 10ppm solution is required. To prepare this, mix 40mL of
the 100ppm solution you have just prepared with 360mL of deionised water.
Dispense the 10ppm solution into two calibration bottles (200mL each).
Achieving the correct temperature
During three point calibration, the 100ppm solution and one batch of the
10ppm solution must be at exactly the same temperature. The second batch of
10ppm solution must be at least 10ºC cooler.
In order to achieve this, one batch of the 10ppm solution should be put into a
refrigerator and the other two solutions should be put into a water bath at
25ºC.
Once all three solutions are at a stable temperature, calibration can begin.
© 2013 Palintest Ltd.
) and Ammonia (NH
standard.
Part number: SS-702-1610
Description: 500mL Ammonium 1000ppm as NH4 ISE
Supplier: T E Laboratories Ltd, Ireland.
Contact: http://www.tellab.ie
www.palintest.com
) can be measured by the MAP 2000/2100
3
The following Ammonium standard
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