Table 7.
Evaluation of five solutions of different concentrations of H2O2 (n = 3) with three different devices with correction (WC) and without correction (WOC).
| Smartphone | Nº Sample | Real [H2O2] (mg/L) |
WOC (mg/L) |
WC (mg/L) |
Relative Error WOC (%) |
Relative Error WC (%) |
|---|---|---|---|---|---|---|
| Xiaomi Redmi 6A | 1 | 1.36 | 3.60 ± 0.19 | 1.69 ± 0.13 | 164.89 | 24.08 |
| 2 | 7.82 | 11.47 ± 0.36 | 8.88 ± 0.30 | 46.79 | 13.56 | |
| 3 | 13.6 | 21.22 ± 0.72 | 16.81 ± 0.59 | 56.06 | 23.65 | |
| 4 | 20.4 | N/A | 21.29 ± 0.47 | N/A | 4.37 | |
| Xiaomi Mi A2 | 1 | 1.36 | 2.35 ± 0.06 | 1.95 ± 0.07 | 73.27 | 43.47 |
| 2 | 7.82 | 9.30 ± 0.27 | 8.92 ± 0.42 | 19.02 | 14.09 | |
| 3 | 13.6 | 18.00 ± 0.34 | 16.96 ± 0.17 | 32.38 | 24.76 | |
| 4 | 20.4 | N/A | 21.32 ± 0.47 | N/A | 4.54 | |
| iPhone 8 | 1 | 1.36 | 2.53 ± 0.13 | 1.75 ± 0.15 | 86.28 | 29.06 |
| 2 | 7.82 | 9.91 ± 0.21 | 8.84 ± 0.18 | 26.75 | 13.11 | |
| 3 | 13.6 | 18.98 ± 0.32 | 16.97 ± 0.20 | 39.56 | 24.77 | |
| 4 | 20.4 | 25.54 ± 1.10 | 21.21 ± 0.53 | 25.19 | 3.99 |