Table 9.
Evaluation of four sample buffers (n = 3) of different pH with three different devices, the data are shown with and without the correction method applied (WC, WOC), CI 95%.
| Smartphone | Nº Sample | Real pH | WOC pH | WC pH | Relative Error WOC (%) |
Relative Error WC (%) |
|---|---|---|---|---|---|---|
| Xiaomi Redmi 6A | 1 | 7.35 | 6.62 ± 0.23 | 7.28 ± 0.11 | 9.89 | 0.84 |
| 2 | 8.74 | 8.98 ± 0.03 | 8.76 ± 0.05 | 2.81 | 0.24 | |
| 3 | 9.83 | 9.99 ± 0.22 | 9.85 ± 0.14 | 1.70 | 0.30 | |
| 4 | 5.11 | N/A | 5.87 ± 0.24 | N/A | 14.94 | |
| Xiaomi Redmi 5 Plus | 1 | 7.35 | 8.07 ± 0.02 | 7.27 ± 0.03 | 9.87 | 1.09 |
| 2 | 8.74 | 9.15 ± 0.04 | 8.91 ± 0.04 | 4.76 | 2.06 | |
| 3 | 9.83 | 9.91 ± 0.15 | 9.80 ± 0.10 | 0.85 | 0.32 | |
| 4 | 5.11 | 7.40 ± 0.02 | 5.63 ± 0.33 | 44.80 | 10.17 | |
| Huawei P30 Lite | 1 | 7.35 | 7.14 ± 0.08 | 7.23 ± 0.06 | 2.77 | 1.57 |
| 2 | 8.74 | 9.03 ± 0.14 | 8.93 ± 0.14 | 3.36 | 2.26 | |
| 3 | 9.83 | 9.60 ± 0.04 | 9.83 ± 0.06 | 2.25 | 0.03 | |
| 4 | 5.11 | N/A | 5.91 ± 0.12 | N/A | 15.79 |