horiba 5002S-10C, Instruction Manual

Page: 30 / 79

18
1
Set the meter as shown below.
2
Prepare the standard solutions.
Prepare the two types of standard solution to create ammonium ion
concentration ratio 1:10.
For example, if the sample solution concentration is 250 mg/L, prepare
standard solutions of 100 mg/L and 1000 mg/L. This case is used as an
example in the following steps.

Prepare at least two types of standard
solution with different concentrations.

Always use new standard solution for
calibration.

After the standard solutions (50 mL)
included in the package is used up, use
the standard solution (500 mL) available
as consumables.
Set the valence as shown in the
table on the right. Setting item Setting value
Valence -1
OH
-
concentration is actually measured by the electrode
after ammonium ion is converted to OH
-
. That is why the
valence is set to -1 although the valence of the ammonium
ion is +1. (
“Ammonia electrodes” (page 54))
Always use new standard solution for calibration.
Note Note
Note Note
Note Note