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Table 1 Influence of the dye content in the sensor’s membrane on the electrode response

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

Sensor I Sensor II
Quantity of BPB added, mg Slope, mV/Decade*±SD Quantity of BCG added, mg Slope, mV/ Decade*±SD
19.00 50.10 ± 1.87 19.00 50.00 ± 0.98
19.50 53.11 ± 0.67 20.00 52.10 ± 1.21
20.00 53.11 ± 0.87 20.10 52.20 ± 1.55
20.01 54.21 ± 1.00 20.20 52.80 ± 1.78
20.02 56.21 ± 0.91 20.30 52.10 ± 1.13
20.03 58.00 ± 1.02 20.40 54.60 ± 0.66
20.04 58.73 ± 1.00 20.50 54.90 ± 0.90
20.05 60.04 ± 0.67 20.55 56.10 ± 1.02
20.10 61.2 ± 1.00 20.60 57.65 ± 1.00
20.20 62.11 ± 1.23 20.70 55.20 ± 0.983
20.50 64.26 ± 1.11 20.80 55.10 ± 1.102
  1. *Average of 5 measurements at pH 3.71 ± 0.10 and T 25 ± 0.2 °C