
Transmitter M400 128
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
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19.3 NIST Technical Buffers
Temp (°C) pH of buffer solutions
0 1.67 4.00 7.115 10.32 13.42
5 1.67 4.00 7.085 10.25 13.21
10 1.67 4.00 7.06 10.18 13.01
15 1.67 4.00 7.04 10.12 12.80
20 1.675 4.00 7.015 10.06 12.64
25 1.68 4.005 7.00 10.01 12.46
30 1.68 4.015 6.985 9.97 12.30
35 1.69 4.025 6.98 9.93 12.13
40 1.69 4.03 6.975 9.89 11.99
45 1.70 4.045 6.975 9.86 11.84
50 1.705 4.06 6.97 9.83 11.71
55 1.715 4.075 6.97 9.83* 11.57
60 1.72 4.085 6.97 9.83* 11.45
65 1.73 4.10 6.98 9.83* 11.45*
70 1.74 4.13 6.99 9.83* 11.45*
75 1.75 4.14 7.01 9.83* 11.45*
80 1.765 4.16 7.03 9.83* 11.45*
85 1.78 4.18 7.05 9.83* 11.45*
90 1.79 4.21 7.08 9.83* 11.45*
95 1.805 4.23 7.11 9.83* 11.45*
* Extrapolated
19.4 NIST standard buffers (DIN and JIS 19266: 2000–01)
Temp (°C) pH of buffer solutions
0
5 1.668 4.004 6.950 9.392
10 1.670 4.001 6.922 9.331
15 1.672 4.001 6.900 9.277
20 1.676 4.003 6.880 9.228
25 1.680 4.008 6.865 9.184
30 1.685 4.015 6.853 9.144
35 1.694 4.028 6.841 9.095
40 1.697 4.036 6.837 9.076
45 1.704 4.049 6.834 9.046
50 1.712 4.064 6.833 9.018
55 1.715 4.075 6.834 8.985
60 1.723 4.091 6.836 8.962
70 1.743 4.126 6.845 8.921
80 1.766 4.164 6.859 8.885
90 1.792 4.205 6.877 8.850
95 1.806 4.227 6.886 8.833
h
NOTE: The pH(S) values of the individual charges of the secondary reference materials are doc-
umented in a certificate of an accredited laboratory. This certificate is supplied with the respec-
tive buffer materials. Only these pH(S) values shall be used as standard values for the second-
ary reference buffer materials. Correspondingly, this standard does not include a table with stan-
dard pH values for practical use. The table above only provides examples of pH(PS) values for
orientation.
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