Ag/AgCl Reference Electrode Based on Thin Film of Arabic Gum Membrane

https://doi.org/10.22146/ijc.28859

Sagir Alva(1*), Aiman Sajidah binti Abdul Aziz(2), Mohd Ismahadi bin Syono(3), Wan Adil bin Wan Jamil(4)

(1) Mechanical Engineering Department, Faculty of Engineering, Universitas Mercu Buana, Jl. Meruya Selatan No. 01, Kembangan, Jakarta-11650, Indonesia
(2) Photonics R&D NST Department, MIMOS Berhad, Technology Park Malaysia, Kuala Lumpur 57000, Malaysia
(3) Nano, MEMS and IC Design NST Department, MIMOS Berhad, Technology Park Malaysia, Kuala Lumpur 57000, Malaysia
(4) Product Development Department, MIMOS Berhad, Technology Park Malaysia, Kuala Lumpur 57000, Malaysia
(*) Corresponding Author

Abstract


The Ag/AgCl reference electrode based on the Arabic Gum (AG) hydrogel films was successfully developed. The Arabic Gum concentration used in this study was 10–40% (w/v) with an optimum concentration of 20% (w/v). In this study, reference electrode performance testing is based on DmV response of Cl-ion’s measurements, stability tests and performance testing against ISE sensors such as K+, NH4+, and NO3-. The Ag/AgCl based reference electrode of the Arabic Gum film shows an average DmV of 4.0 ± 0.7 mV when response test is performed against a standard Ag/AgCl double junction electrode in various concentrations of Cl-ion’s. Meanwhile, in stability testing conducted in a 0.01 M KCl solution for 72 h found drift of < 0.6 mV/h. The reference performance test of the Arabic Gum reference electrode with three types of ISE NH4+, K+ and NO3- commercial sensors obtaining a slope closer to the Nernst value is 54.9 ± 0.9, 52.3 ± 0.5 and -53.2 ± 0.2 mV/dec with all having a linear distance of 0.1–10-5 M.


Keywords


solid state reference electrode; Arabic gum; ion-selective electrode; screen printed electrode

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DOI: https://doi.org/10.22146/ijc.28859

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