Table 2.
pH and pO2 a) measured with dual-sensor membrane
| Set-point | Measured values method A | Measured values method C | Measured values method B | Measured values method D | |
|---|---|---|---|---|---|
| pH b) | 5.53c) | 5.37 (-0.16) | 5.42 (-0.11) | ||
| 7.16d) | 7.07 (-0.09) | 7.14 (-0.02) | |||
| 7.60 d) | 7.63 (+0.03) | 7.64 (+0.04) | |||
| pO2e) | 5.1 | 4.6 (-0.5) | 4.6 (-0.5) | ||
| 8.1 | 8.4 (+0.3) | 8.2 (+0.1) | |||
| 10.1 | 9.7 (-0.4) | 9.7 (-0.4) | |||
| 12.2 | 12.0 (-0.2) | 12.5 (+0.3) | |||
| 15.2 | 14.6 (-0.6) | 15.5 (+0.3) | |||
| 20.2 | 19.0 (-1.2) | 20.7 (+0.5) |
(a)
pO2 represents the oxygen partial pressure in kPa;
(b)
Oxygen partial pressure of 21 kPa corresponding to [O2] of 8.6 mg L-1;
c)
pH 5.53 solution composed of tris(hydroxymethyl) aminomethane and hydrochloride acid with 10 mM NaCl;
d)
B-R buffers;
e)
Measurements carried out in pH 7.5 B-R buffer.