Synthesis and Characterization of New Zn-ion Selective Membranes as Sensors for Environmental Monitoring
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Abstract
Ion-selective electrodes (ISEs) made from Zn²⁺ ion-selective membranes were synthesized for use as potentiometric electrochemical sensors for water pollution detection with heavy metals for the first time. The electrode consisted of Zn²⁺ ions as an ion exchanger and polyvinyl chloride and tris (2-ethylhexyl) phosphate as a plasticizer. The response properties of this electrode, UV-visible spectra of the sample, calibration curve, lifetime, limit of detection, linear range, and pH effect were studied. The limit of detection (LOD) for Zn²⁺ was 0.891 ppm, the correlation coefficient was about 0.983, the lifetime was approximately 25 days, and the linear range was from 0.153×10-4 to 1.07×10-4. The best sensitivity was observed at the pH range of 5–10. It offers a robust, rapid potentiometric sensor for zinc in field water. The system's small size, inexpensive materials, and ability to measure speed and accuracy make it ideal. An interesting characteristic of the sensor was that a short time was required to reach the equilibrium potential.
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