4 stored buffer series for cal ph – Metrohm 840 PC Control 5.0 / Touch Control User Manual
Page 323
6
Appendix
PC Control / Touch Control
311
6.4 Stored buffer series for CAL pH
For automatic buffer recognition during pH calibration the temperature-
dependent pH values of several common pH buffers are stored in the
system. Apart from the Metrohm buffer solutions other reference 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)
Met4
Met7
Met9
NIST1
NIST4
NIST7
NIST9
NIST13
Temp.
(°C)
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 -