Development of solid-state reference electrode based on sodium polyanethol sulfonate immobilised on cellulose acetate

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 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 nh4+,k+ and no3- 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. © penerbit universiti sains malaysia,2017.