Hach 8362sc, User Manual

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42
sc1000 Operation
Figure 15 Measurement System—Removing the Flow Chamber
5.7.1.1 Buffer Solutions (pH)
The pH of buffer solutions are dependent on temperature. The nominal pH values are
referenced to a temperature of 25 °C (77 °F). Refer to
Table 4 for NIST standard buffer
solutions and DIN buffer values for a variety of temperatures. Always check the buffer
table for the value of the buffer in use at the operating temperature.
Table 4 NIST and DIN Buffers
Temp (°C)
NIST Buffer DIN Buffer
Buffer 4.00 Buffer 6.88 Buffer 9.00 Buffer 4.00 Buffer 6.88 Buffer 9.00
0 4.01 6.984 9.464 4.05 7.13 9.24
5 4 6.951 9.395 4.04 7.07 9.16
10 4 6.923 9.332 4.02 7.05 9.11
15 4 6.9 9.276 4.01 7.02 9.05
20 4 6.881 9.225 4 7 9
25 4.01 6.865 9.18 4.01 6.98 8.95
30 4.01 6.853 9.139 4.01 6.98 8.91
35 4.02 6.844 9.102 4.01 6.96 8.88
40 4.03 6.838 9.068 4.01 6.85 8.85
45 4.04 6.834 9.038 4.01 6.9 8.82
50 4.06 6.833 9.01 4.01 6.95 8.79
55 — 6.833 8.985 4.01 6.95 8.76