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Table 2 The selectivity coefficients of sensors for different interferents

From: Application of ion pair complexes to design novel potentiometric membrane sensors for direct determination of frusemide in pharmaceuticals

Interferent Selectivity coefficient, KA,I*
FUR-BPB sensor FUR-BCG sensor
NaOH 0.084 0.075
KNO2 0.254 0.354
NaNO2 0.096 0.089
C2O4H2 0.179 0.246
Na2CO3 0.160 0.234
NaCl 0.074 0.068
CaCl2 0.702 0.715
ZnSO4 0.021 0.032
NaoAc 0.208 0.304
Glycine 0.079 0.065
Ammonium oxalate 0.022 0.032
Formate 0.092 0.034
Citrate 0.034 0.435
Tartarate 0.045 0.312
Benzoate 0.088 0.097
Salicylate 0.044 0.046
Phthalate 0.097 0.023
Oxalate 0.122 0.123
Chloride 0.133 0.111
Sulphate 0.135 0.134
Borate 0.786 0.666
Talc 0.054 0.065
  1. *Average of 5 determinations