Table 1.
Comparison of the sensing ability for free-Cl with different electrochemical sensors.
| Electrode | Reaction | pH | Applied potential (V) | Limit of detection (ppm) | Linear range (ppm) | Stability (days) | Refs. |
|---|---|---|---|---|---|---|---|
| Graphite electrode | Oxidation | 8 | 1.4 | 1.0 | 1.0–300.0 | N/A | 64 |
| Au film microelectrode | Reduction | 5.5 | 0.35 | 0.02 | 0.02–5 | > 10 | 65 |
| Polymelamine-SPCE | EC | 7 | 0.125 | 0.4 | 0.4–521 | > 7 | 66 |
| Boron-doped diamond electrode | Oxidation | 8 | 1.4 | 0.016 | 0.1–100 | > 3 months | 23 |
| CuO-NPs/MWCNT/epoxy | Reduction | 5.5 | − 0.35 | 0.0006 | 0.056–450 | > 7 | 60 |
| SPCE/PB-BZT | Reduction | 5.2 | − 0.2 | 0.0825 | 0.008–3 | > 3 months | 67 |
| PDA@ERGO/GCE | EC | 7.2 | 0.15 | 0.0032 | 0.736–16 | > 28 | 6 |
| CB-SPE | Reduction | 5 | − 0.1 | 0.01 | 0.05–200 | N/A | 20 |
| PPMM@PDA/PEI@Ag | Reduction | N/A | − 0.3 | 0.07 | 0.1–20 | N/A | 25 |
| silicon-BDD/Pt based electrode | Reduction | 8.5 | − 0.35 | 0.056 | 5–200 | > 50 days | 24 |
| CuO-ZIF-8/GCE | Reduction | 6 | − 0.1 | 0.012 | 0.25–60 | > 1 month | This work |
N/A not available.