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.
| Parameter | CPE | PVC |
| Linear range (mol ) | to | to | Slope, mV | 52.51 ± 0.20 | 51.51 ± 0.25 | Intercept | 480.98 | 392.98 | Correlation coefficient | 0.9865 | 0.9973 | Percent recovery (%) ± SD | 98.97 ± 0.53 | 98.62 ± 0.74 | Detection limit (mol ) | | | Working pH range | 3–6 | 2–7 | Life time, day | 82 | 35 | RSD (%) | 1.54 | 1.69 | Accuracy (%) | 99.27 | 98.85 | Precision (%) | 0.98 | 1.88 |
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