Table 3.
Stability data for the REs tested.
| Electrode | Stability * [μV] | Drift ** [μV/h] | ||
|---|---|---|---|---|
| 1 h SD | 10 h SD | 20 h SD | ||
| QB30(PVC)-03 | 35 | 62 | 124 | 3 |
| QB30(PVC)-11 | 4 | 6 | 11 | 1 |
| QB10(PU)-1 | 5 | 29 | 94 | 23 |
| QB10(PU)-3 | 8 | 28 | 163 | 19 |
| QB25(PU)-3 | 3 | 35 | 42 | 0.8 |
| QB25(PU)-5 | 3 | 27 | 36 | 0.4 |
| RKCl1 | 7 | 12 | 66 | 7 |
| RKCl2 | 7 | 12 | 77 | 7 |
| PVA1 | 10 | 29 | 160 | 21 |
| UF20e | 16 | 34 | 42 | 16 |
| UF20f | 15 | 15 | 24 | 9 |
| Orion Ross Ultra | 3 | 4 | 4 | 0.02 ≈ 0 |
| Orion Ross Sureflow | 122 | 57 | 140 | 95 |
| REFEX© | 99 | 224 | 195 | 10 |
* Stability was calculated as the standard deviation for measuring times 1, 10, and 20 h. ** Drift was calculated as the linear slope approximation from the final 30 h of measurement.