11
pH BUFFER TEMPERATURE DEPENDENCE
Temperature has an effect on pH. The calibration buffer solutions are
affected by temperature changes to a lesser degree than normal
solutions.
For manual temperature calibration please refer to the following chart.
For instance, if the buffer temperature is 25 °C, the display should
show pH4.01, 7.01 or 10.01 at pH4, 7 or 10 buffers, respectively.
At 20 °C, the display should show pH4.00, 7.03 or 10.06. The meter
reading at 50 °C will then be 4.06, 6.98 or 9.82.
TEMP
pH BUFFERS
°C
°F
4.01
6.86
7.01
9.18
10.01
0
32
4.01
6.98
7.13
9.46
10.32
5
41
4.00
6.95
7.10
9.39
10.24
10
50
4.00
6.92
7.07
9.33
10.18
15
59
4.00
6.90
7.05
9.27
10.12
20
68
4.00
6.88
7.03
9.22
10.06
25
77
4.01
6.86
7.01
9.18
10.01
30
86
4.02
6.85
7.00
9.14
9.96
35
95
4.03
6.84
6.99
9.11
9.92
40
104
4.04
6.84
6.98
9.07
9.88
45
113
4.05
6.83
6.98
9.04
9.85
50
122
4.06
6.83
6.98
9.01
9.82
55
131
4.08
6.84
6.98
8.99
9.79
60
140
4.09
6.84
6.98
8.97
9.77
65
149
4.11
6.84
6.99
8.95
9.76
70
158
4.12
6.85
6.99
8.93
9.75
75
167
4.14
6.86
7.00
8.91
9.74
80
176
4.16
6.87
7.01
8.89
9.74
85
185
4.17
6.87
7.02
8.87
9.74
90
194
4.19
6.88
7.03
8.85
9.75
95
203
4.20
6.89
7.04
8.83
9.76