| Interfering Species |
| |||
| Electrode (I) | Electrode (II) | |||
| SSM | MPM | SSM | MPM | |
| Na+ | −6.47 | −6.69 | −6.05 | −6.55 |
| K+ | −2.08 | −2.28 | −4.22 | −4.45 |
| Cd2+ | −3.54 | −3.96 | −3.15 | −3.55 |
| Ni2+ | −2.98 | −3.17 | −4.89 | −5.004 |
| Co2+ | −3.34 | −3.53 | −3.34 | −3.64 |
| Hg2+ | −6.49 | −6.79 | −6.59 | −6.71 |
| Mn2+ | −3.95 | −4.03 | −3.57 | −3.93 |
| Cu2+ | −5.02 | −5.41 | −6.85 | −7.05 |
| Fe3+ | −1.01 | −1.07 | −1.04 | −1.09 |