Metrohm 949 - Usa

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9 Appendix
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53
Temp.
(°C)
NIST (according to DIN standard 19266, 2015-05)
pH
1.68
pH
4.00
pH
6.86
pH
9.18
pH
12.45
25 1.68 4.01 6.86 9.18 12.45
30 1.69 4.01 6.85 9.14 12.29
35 1.69 4.02 6.84 9.11 12.13
40 1.70 4.03 6.84 9.07 11.99
45 1.70 4.04 6.83 9.04 11.84
50 1.71 4.06 6.83 9.01 11.70
NOTE
Update
The values of the individual buffers with the corresponding tempera-
tures are kept as up to date as possible.
However, they may be changed by the respective manufacturers.
The NIST buffers are identical to the buffer solutions that are used in
Chinese pharmacopoeia.
9.1.3 USA
Table 7
Buffer solutions USA
Temp.
(°C)
USA
pH
1.68
pH
4.01
pH
7
pH
10.01
pH
12.45
0 1.67 4.01 7.12 10.32 13.43
5 1.67 4.01 7.09 10.25 13.21
10 1.67 4.01 7.06 10.18 13.00
15 1.67 4.00 7.04 10.12 12.81
20 1.68 4.00 7.02 10.06 12.63
25 1.68 4.01 7.00 10.01 12.45
30 1.69 4.01 6.99 9.97 12.29
35 1.69 4.02 6.98 9.93 12.13
40 1.70 4.03 6.97 9.89 11.99
45 1.70 4.04 6.97 9.86 11.84
50 1.71 4.06 6.97 9.83 11.70