Ionode IJ pH V5.1 - Manual (Page 37)

Ionode IJ Instruction Manual 37
Table 8:
ZoBell’sSolution vs Ag/AgCl/Sat KCl
Reference)
Temperature (ºC) Potential (mV)
5 273
10 262
15 251
20 240
25 229
30 218
pH 4 Quinhydrone Solution
Add sufficient quinhydrone to NBS pH 4.01
buffer to make a saturated solution.
pH 6.86 Quinhydrone Solution
Add sufficient quinhydrone to NBS pH 6.87
buffer to make a saturated solution.
pH 9.18 Quinhydrone Solution
Add sufficient quinhydrone to NBS pH 9.18
buffer to make a saturated solution.
Table 9: Quinhydrone Solution (Ref: Ag/AgCl/
Saturated KCl)
Temperature
(ºC)
Potential (mV)
pH 4.01 pH 6.87 pH 9.18
20 +268 +105 -23
25 +264 +98 -32
30 +260 +91 -41