Abstract
An all-solid-state potassium electrode based on tin oxide /indium tin oxide (ITO) glass is developed in this paper. The sensing membrane of the electrode is prepared by mixing poly(vinyl chloride) (PVC), bis(2-ethylhexyl) sebacate (DOS), valinomycin (VAL), and potassium tetrakis(p-chlorophenyl) borate (KTpClPB). The mixed solution is dissolved in tetrahydrofuran (THF). Then, it is dropped on the sensing window of /ITO glass. In addition, the wire, which is coated PVC membrane containing powder, is used as a miniaturized reference electrode in this study. The optimum experiment of the potassium sensor is conducted by observing the characteristics of sensitivity and selectivity in different weight ratios. After the optimum experimental trials, the best weight ratio of the potassium sensor is PVC:DOS:VAL:KTpClPB = 33:66:4:2. In this optimum condition, the sensitivity is /decade with linear concentration range between and . The low detection limit of the sensor reaches to , and response time is . Moreover, the sensor is slight interfered by sodium, calcium, and magnesium ions. The pH variation does not affect its electromotive force in the range between pH 6 and pH 12. The sensor possesses reusable properties showing that it can be repeated, measuring 30 times.
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