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72
Temperature has an effect on pH. The calibration buffer solutions are affected by temperature
changes to a lower degree than normal solutions.
During calibration the instrument will automatically calibrate to the pH value corresponding to the
measured or set temperature.
TEMP pH BUFFERS
°C K °F 1.679 3.000 4.010 6.862 7.010 9.177 10.010 12.454
0 273 32 1.670 3.072 4.007 6.982 7.130 9.459 10.316 13.379
5 278 41 1.670 3.051 4.002 6.949 7.098 9.391 10.245 13.178
10 283 50 1.671 3.033 4.000 6.921 7.070 9.328 10.180 12.985
15 288 59 1.673 3.019 4.001 6.897 7.046 9.273 10.118 12.799
20 293 68 1.675 3.008 4.004 6.878 7.027 9.222 10.062 12.621
25 298 77 1.679 3.000 4.010 6.862 7.010 9.177 10.010 12.450
30 303 86 1.683 2.995 4.017 6.851 6.998 9.137 9.962 12.286
35 308 95 1.688 2.991 4.026 6.842 6.989 9.108 9.919 12.128
40 313 104 1.693 2.990 4.037 6.837 6.983 9.069 9.881 11.978
45 318 113 1.700 2.990 4.049 6.834 6.979 9.040 9.847 11.834
50 323 122 1.707 2.991 4.062 6.834 6.978 9.014 9.817 11.697
55 328 131 1.715 2.993 4.076 6.836 6.979 8.990 9.793 11.566
60 333 140 1.724 2.995 4.091 6.839 6.982 8.969 9.773 11.442
where: C
SAMP
- the sample concentration;
C
STD
- the standard concentration;
V
SAMP
- the sample volume;
V
STD
- the standard volume;
V
ISA
- ISA volume;
∆E - the difference of potential from the electrode;
S - the electrode slope, determined in a previous
calibration;
f
- the stoichiometric ratio between sample and
standard;
65 338 149 1.734 2.998 4.107 6.844 6.987 8.948 9.757 11.323
70 343 158 1.744 3.000 4.123 6.850 6.993 8.929 9.746 11.211
75 348 167 1.755 3.002 4.139 6.857 7.001 8.910 9.740 11.104
80 353 176 1.767 3.003 4.156 6.865 7.010 8.891 9.738 11.003
85 358 185 1.780 3.002 4.172 6.873 7.019 8.871 9.740 10.908
90 363 194 1.793 3.000 4.187 6.880 7.029 8.851 9.748 10.819
95 368 203 1.807 2.996 4.202 6.888 7.040 8.829 9.759 10.734
During calibration the instrument will display the pH buffer value at 25 °C.
pH BUFFER TEMPERATURE DEPENDENCE
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