6
ba15360e03
10/2014
Sample preparation
K 500 / K 800
Sample preparation
Add 2 % ISA/K solution.
This sample conditioning solution creates optimum conditions for measuring.
It provides a constant ionic strength and similar diffusion potentials at the
reference electrode in standard solution and test sample.
Note
If you would like to have more detailed information concerning sample prep-
aration and measuring procedures, WTW provides a large number of appli-
cation reports for various applications.
Response times
The response time depends on the concentration range. It is
several seconds at high concentrations,
several minutes near the detection limit.
The measured value is stable if the value does not change by more than
0.1 mV within 30 seconds.
Interferences
Interfering ions: 10 % error with the following concentration ratio
(concentration ratio = interfering ion / measured ion):
Cs
+
NH
4
+
Tl
+
H
+
Ag
+
Tris
+
Li
+
Na
+
0.3
6
6
10
1000
1000
2000
2000
