Table 1 General characteristics of the three microfabricated proposed sensors
Parameter | Sensor 1 | Sensor 2 | Sensor 3 |
|---|---|---|---|
Slope (mV/ decade) ± SD * | 59.87 ± 0.26 | 59.88 ± 0.19 | 60.01 ± 0.11 |
Intercept (mV) | 182.62 | 81.19 | 79.41 |
LOD (M) ** | 9.87 × 10− 9 | 9.62 × 10− 10 | 9.94 × 10− 11 |
Response time (sec.) | 12 | 10 | 10 |
Working pH range | 7.0–11.0 | 7.0–11.0 | 7.0–11.0 |
Concentration linear range (M) | 1 × 10− 8 – 1 × 10− 3 | 1 × 10− 9 – 1 × 10− 3 | 1 × 10− 10 – 1 × 10− 3 |
Stability (days) | 45 | 60 | 60 |
Average recovery (%) ± SD | 99.98 ± 1.34 | 100.01 ± 1.35 | 99.99 ± 0.27 |
Correlation coefficient | 0.9999 | 0.9999 | 0.9999 |
Repeatability (% RSD) | 1.21 | 0.81 | 0.67 |
Intermediate precision (% RSD) | 1.51 | 0.97 | 0.95 |