Research Article

Potentiometric Determination of Ketotifen Fumarate in Pharmaceutical Preparations and Urine Using Carbon Paste and PVC Membrane Selective Electrodes

Table 2

Critical response characteristics of CPE and PVC sensors.

ParameterCPEPVC

Linear range (mol  ) to to
Slope, mV  52.51 ± 0.2051.51 ± 0.25
Intercept480.98392.98
Correlation coefficient0.98650.9973
Percent recovery (%) ± SD98.97 ± 0.5398.62 ± 0.74
Detection limit (mol  )
Working pH range3–62–7
Life time, day8235
RSD (%)1.541.69
Accuracy (%)99.2798.85
Precision (%)0.981.88