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Single and Dual Input Analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468
Appendix
A
68
IM/AX4PH
Issue 9
Appendix A
A.1 Buffer Solutions
The pH value of buffer solutions is influenced considerably by
temperature variations. Thus, when significant temperature
fluctuations occur, it is general practice to correct automatically
the measured, prevailing pH to the value that would apply if the
solution temperature were 25ºC (77ºF), the internationally
accepted standard.
Tables A1 to A5 include the pH values for ABB, DIN, Merck,
NIST, and US Technical buffer solutions. Standards are for 4, 7
and 9pH values, from 0 to 95ºC (32 to 203ºF).
Temp
ABB Buffers
ºC
ºF
4.01pH
7pH
9.18pH
0
32
4.000
7.110
9.475
5
41
3.998
9.409
10
50
3.997
7.060
9.347
15
59
3.998
9.288
20
68
4.001
7.010
9.233
25
77
4.005
7.000
9.182
30
86
4.011
6.980
9.134
35
95
4.018
9.091
40
104
4.027
6.970
9.051
45
113
4.038
9.015
50
122
4.050
6.970
8.983
55
131
4.064
8.956
60
140
4.080
6.970
8.932
65
149
4.097
8.913
70
158
4.116
6.990
8.898
75
167
4.137
8.888
80
176
4.159
7.030
8.882
85
185
4.183
8.880
90
194
4.208
7.080
8.884
95
203
4.235
8.892
Table A.1 ABB Buffer Solutions
Temp
DIN 19266 Buffers
ºC
ºF
1.68pH
4.01pH
6.86pH
9.18pH
0
32
1.666
4.003
6.984
9.464
5
41
1.668
3.999
6.951
9.395
10
50
1.670
3.998
6.923
9.332
15
59
1.672
3.999
6.900
9.276
20
68
1.675
4.002
6.881
9.225
25
77
1.679
4.008
6.865
9.180
30
86
1.683
4.015
6.853
9.139
35
95
1.688
4.024
6.844
9.102
40
104
1.694
4.035
6.838
9.068
45
113
1.700
4.047
6.834
9.038
50
122
1.707
4.060
6.833
9.011
55
131
1.715
4.075
6.834
8.985
60
140
1.723
4.091
6.836
8.962
65
149
70
158
1.743
4.126
6.845
8.921
75
167
80
176
1.766
4.164
6.859
8.885
85
185
90
194
1.792
4.205
6.877
8.850
95
203
1.806
4.227
6.886
8.833
Table A.2 DIN Buffer Solutions