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Table 2 Selectivity coefficients of the obtained sensors

From: Potentiometric detection and removal of copper using porphyrins

Interfering ion (X) Electrode A Electrode B Electrode C
Ni2+ - 4.38 - 5.56 - 5.84
Mn2+ - 1.60 - 3.28 - 1.03
Co2+ - 3.67 - 4.16 - 2.99
Fe3+ + 1.27 - 0.80 - 0.92
Na+ - 1.70 - 1.68 - 1.87
Li+ - 2.33 - 3.74 - 2.08
Zn2+ - 1.00 - 2.27 −3.19
Pb2+ - −1.26 -
Al3+ - −2.73 -
  1. The table presents the selectivity coefficients of the obtained sensors calculated using equation (1) towards a number of 9 cations: Ni2+, Mn2+, Co2+ Pb2+, Zn2+, Fe3+, Al3+, Na+ and Li+.