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About interfering ions in K
+
concentration
measurement
When a high concentration of cations exists, the potassium ion selective
electrode will be affected by, for example, measurement errors and
electrode drift due to the interference by cations.
The following table lists the cations that cause a 10% error with respect to
the K
+
concentration and their corresponding concentrations.
Table 7 Substances that cause a 10% error in the reading, and their concentrations
If drift of the potential or reduction in the response speed occurs, high
interference by the ions shown in the table is likely to be occurring.
In such a case, soak the potassium ion selective electrode in pure water for
one hour and then soak it in the standard solution for a few hours to restore
a normal state.
Unit: mg/L
Interfering cation
K
+
concentration
1 mg/L
10 mg/L
100 mg/L
Rb
+
0.3
3
34
Cs
+
4
44
443
NH
4
+
12
120
1200
Li
+
70
700
7000
Na
+
230
2300
23000
Mg
2+
240
2400
24000
Ca
2+
400
4000
40000
Sr
2+
876
8760
87600
Ba
2+
1370
13700
137000
Summary of Contents for 6582S-10C
Page 1: ...Instruction Manual Combination type Potassium Ion Selective Electrode 6582S 10C ELECTRODE...
Page 18: ...8...
Page 52: ...42...
Page 62: ...52...
Page 79: ...69 Specifications External dimensions Unit mm 16 5 O D 18 85 150...