
9 Appendix
826/827 pH meter, Instructions for Use 57
9.3 Stored buffer series
For automatic buffer recognition during pH calibration the temperature-
dependent pH values of several common pH buffers are stored in the
826/827 pH meter. Apart from the Metrohm buffer solutions other refer-
ence and technical buffers are also included in the tables.
The following tables provide an overview of the stored pH(T) series:
The pH values printed in bold are the values at the reference tempera-
ture of the particular buffer set.
The pH values marked with
1)
are interpolated or extrapolated values, all
the others correspond to the manufacturer's specifications.
Metrohm NIST (according to DIN standard 19266, 2000)
Temp.
(°C)
Met4 Met7 Met9 NIST1 NIST4 NIST7 NIST9 NIST13
pH 4.00 pH 7.00 pH 9.00 pH 1 pH 4 pH 7 pH 9 pH 13
0 3.99 7.11 9.27 - 4.010 6.984 9.464 13.423
5 3.99 7.08 9.18 1.668 4.004 6.950 9.392 13.207
10 3.99 7.06 9.13 1.670 4.001 6.922 9.331 13.003
15 3.99 7.04 9.08 1.672 4.001 6.900 9.277 12.810
20 3.99 7.02 9.04 1.676 4.003 6.880 9.228 12.627
25 4.00 7.00 9.00 1.680 4.008 6.865 9.184 12.454
30 4.00 6.99 8.96 1.685 4.015 6.853 9.144 12.289
35 4.01 6.98 8.93 1.691 4.025 6.843 9.107 12.133
40 4.02 6.98 8.90 1.697 4.036 6.837 9.076 11.984
45 4.03 6.97 8.87 1.704 4.049 6.834 9.046 11.841
50 4.04 6.97 8.84 1.712 4.064 6.833 9.018 11.705
55 4.06 6.97 8.81 1.715 4.075 6.834 8.985 11.574
60 4.07 6.97 8.79 1.723 4.091 6.836 8.962 11.449
65 4.09 6.98 8.76 1.732
1)
4.108
1)
6.840
1)
8.941
1)
-
70 4.11 6.98 8.74 1.743 4.126 6.845 8.921 -
75 4.13 6.99 8.73 1.754
1)
4.145
1)
6.852
1)
8.902
1)
-
80 4.15 7.00 8.71 1.766 4.164 6.859 8.885 -
85 4.18 7.00 8.70 1.778
1)
4.185
1)
6.867
1)
8.867
1)
-
90 4.20 7.01 8.68 1.792 4.205 6.877 8.850 -
95 4.23 7.02 8.67 1.806 4.227 6.886 8.833 -
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