25
10. Standard solutions
10.1. Buffer solutions
The pH values of the buffer solutions are shown by temperature in Table 1.
Table 1. Stored pH, Redox and temperature values
Temperature
pH mV
°C °F
0 32 2.01 4.01 7.12 9.52 10.30 ––
10 50 2.01 4.00 7.06 9.38 10.17 245
20 68 2.00 4.00 7.02 9.26
10.06
228
25 77 2.00 4.01 7.00 9.21 10.01 220
30 86 2.00 4.01 6.99 9.16 9.96 212
40 104 2.00 4.03 6.97 9.06 9.88 195
50 122 2.00 4.06 6.97 8.99 9.82 178
60 140 2.00 4.10 6.98 8.93 9.76 160
70 158 2.01 4.16 7.00 8.88 –– 142
80 176 2.01 4.22 7.04 8.83 –– ––
90 194 2.01 4.30 7.09 8.79 –– ––
10.2. Conductivity standard solutions
The conductivity values of the standard solutions are shown by temperature in Table 2.
Table 2. Stored conductivity and temperature values
Temperature Conductivity (CE)
°C °F µS/cm µS/cm mS/cm mS/cm
15.0 59 119 1147 10.48 92.5
16.0 60.8 122 1173 10.72 94.4
17.0 62.6 125 1199 10.95 96.3
18.0 64.4 127 1225 11.19 98.2
19.0 66.2 130 1251 11.43 100.1
20.0 68 133 1278 11.67 102.1
21.0 69.8 136 1305 11.91 104.0
22.0 71.6 139 1332 12.15 105.4
23.0 73.4 142 1359 12.39 107.9
24.0 75.2 145 1386 12.64 109.8
25.0 77 147 1413 12.88 111.8
26.0 78.8 150 1440 13.13 113.8
27.0 80.6 153 1467 13.37 115.7
28.0 82.4 156 1494 13.62 --
29.0 84.2 159 1522 13.87 --
30.0 86 162 1549 14.12 --
31.0 87.8 165 1581 14.37 --
32.0 89.6 168 1609 14.62 --
33.0 91.4 171 1638 14.88 --
34.0 93.2 174 1667 15.13 --
35.0 95 177 1696 15.39 --
ENGLISH
sensION+ MM150 HACH 0710.indd ANG:25sensION+ MM150 HACH 0710.indd ANG:25 7/9/10 13:03:057/9/10 13:03:05
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