NIST pH buffers
Temp. 1.68 4.01 6.87 9.18 12.45
0°C 1.666 4.003 6.984 9.464 13.423
5°C 1.668 3.999 6.951 9.395 13.207
10°C 1.670 3.998 6.923 9.332 13.003
15°C 1.672 3.999 6.900 9.276 12.810
20°C 1.675 4.002 6.881 9.225 12.627
25°C 1.679 4.008 6.865 9.180 12.454
30°C 1.683 4.015 6.853 9.139 12.289
40°C 1.694 4.035 6.838 9.068 11.984
50°C 1.707 4.060 6.833 9.011 11.705
60°C 1.723 4.091 6.836 8.962 11.449
70°C 1.743 4.126 6.845 8.921
80°C 1.766 4.164 6.859 8.885
Standard pH buffers
Temp. 2.00 4.00 7.00 9.21 10.01 12.00
5°C 1.85 3.99 7.08 9.45 10.24 12.56
10°C 1.89 3.99 7.06 9.38 10.18 12.35
20°C 1.96 3.99 7.02 9.26 10.06 12.14
25°C 2.00 4.00 7.00 9.21 10.01 12.00
30°C 2.03 4.01 6.99 9.16 9.87 11.89
40°C 2.08 4.03 6.98 9.06 9.89 11.71
50°C 2.12 4.06 6.97 8.99 9.83 11.52
60°C 2.14 4.09 6.98 8.93 9.79 11.33
Conductivity standards
Temp. 0.01 M 0.1 M 1 M (mS/cm)
0°C 0.776 7.15 65.4
5°C 0.896 8.22 74.1
10°C 1.020 9.33 83.2
15°C 1.147 10.48 92.5
20°C 1.278 11.67 102.1
25°C 1.413 12.88 111.8
30°C 1.552 14.12 121.7
35°C 1.694 15.38 131.7
40°C 1.839 16.67 142.1
Redox standards
Temp. 124 358 (mV)
0°C 156 388
5°C 148 381
10°C 141 376
15°C 135 370
20°C 130 364
25°C 124 358
30°C 122 352
35°C 116 346
40°C 99 340
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