CHARACTERIZATION OF MEMBRANE PVA-ENZYME COATED PVC-KTpCIPB AS UREA SENSOR WITH POTENTIOMETRIC METHOD

Membranes with PVA, enzymes, and PVC-KTpClPB contribute as pores on the indicator electrode of potentiometric cells to produce voltage. This study aimed to characterize membranes modified with PVA, enzymes, and PVC-KTpClPB as urea sensors. Membrane modification was done in three variations: membrane A (0.504 g of PVA, 0.504 g of PVC, 1 mg of enzymes, and 0.012 g of KTpCIPB), membrane B (0.035 g of PVA, 0.035 g of PVC, 1 mg of enzymes, and 0.012 g of KTpCIPB), and membrane C (0.035 g of PVA, 0.035 g of PVC, 1 mg of enzymes, and 0.050 g of KTpCIPB). The analysis was performed using UV-Visible to obtain the best membranes, namely membrane A and C. The preparation of electrodes was carried out using membrane A and C with various PVA coatings, such as one coating for membrane electrode A1 and C1, two coatings for membrane electrode A2 and C2, and three coatings for membrane electrode A3 and C3. XRD analysis was performed to obtain the best membrane electrode which was the membrane electrode C2. Based on the measurement analysis of electrode membrane in the potentiometric cells with electrochemical techniques, the sensitivity obtained was 19.069 mV/decade with a confidence level of R2 = 0.9434 in the range of 1.10-5-5.10-4 M and detection limit of 1.10-5M.