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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