Development of Solid-state Reference Electrode Based on Sodium Polyanethol Sulfonate Immobilised on Cellulose Acetate

Sagir Alva, Aiman Aziz, Mohd Ismahadi Syono, Darwin Sebayang
2017 Journal of Physical Science  
In this study, we successfully developed a solid-state reference electrode based on sodium polyanethol sulfonate (SPS) immobilised on a cellulose acetate membrane and coated on a layer of polypyrrole on top of a carbon screen-printed electrode (SPE). We varied the concentration of SPS salt from 1% to 5% (w/v) and achieved an optimal concentration of 4%. SPS optimisation test was performed by varying concentrations of KCl and pH buffer solution. The slope obtained for 4% SPS was 3.5 ± 0.3 with a
more » ... as 3.5 ± 0.3 with a residual standard deviation (RSD) of 9.3% of KCl solution, whereas the slope obtained for pH buffer solution was 3.4 ± 0.2 with 1.2% RSD. The stability test in pH 7 buffer and 10 −3 M KCl yielded drift at <0.4 mV/h for 60 h of continuous monitoring. We also performed tests using standard NH 4 +, K+ and NO 3 − ion-selective electrode sensors, and the slopes measured were respectively 52.4 ± 0.4, 51.4 ± 0.4, and −52.3 ± 0.9 mV/dec with a dynamic range of 0.1-10 −5 M.
doi:10.21315/jps2017.28.2.11 fatcat:ww6i2aooljfxpcox3l7pwbgwsu