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