8.
Appendix
8.1
Conductivity standards
T( °C)
5
0
5
20
25
30
35
8.2
Examples of temperature coefficients (α-value)
Substance at 25 °C
HCl
KCl
CH
COOH
3
NaCl
H
SO
2
4
HF
α-coefficients of conductivity standards for a calcualation to reference tempearture of 25°C
Standard
84 µS/cm
1413 µS/cm
12.88 mS/cm
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84 µS/cm
1413 µS/cm
53 μS/cm
896 μS/cm
60 μS/cm
020 μS/cm
68 μS/cm
47 μS/cm
76 μS/cm
278 μS/cm
84 μS/cm
43 μS/cm
92 μS/cm
552 μS/cm
0 μS/cm
667 μS/cm
Concentration [%]
0
0
0
0
0
.5
Measurement
Measurement
temp.: 15°C
temp.: 20°C
.95
.95
.94
.94
.90
.89
12.88 mS/cm
8.22 mS/cm
9.33 mS/cm
0.48 mS/cm
.67 mS/cm
2.88 mS/cm
4.2 mS/cm
5.39 mS/cm
Temperature coefficient α [%/°C]
.56
.88
.69
2.4
.28
7.20
Measurement
temp.: 30°C
.95
.94
.9
Appendix
Measurement
temp.: 35°C
2.0
.99
.95
5
13.03.2007 16:28:05