SCREEN-PRINTED POTASSIUM ION SENSOR FABRICATED FROM PHOTOCURABLE AND SELF-PLASTICIZED ACRYLIC FILM

Potassium ion sensor based on photocured poly(n-butyl acrylate) membrane has been fabricated on screen printed electrode (SPE) through a photocuring technique. The advantage of the fabrication method allows miniatured but two-dimensional sensor that is disposable to be designed. The potassium ion sensor yielded a Nernstian response, i.e., 58.5 ± 0.5 mV/decade when the potassium ion concentrations were 10–1–10–5M. The limit of detection was close to (2.5 ± 0.57) × 10–6 M. The potassium ion SPE also demonstrated little interference from cations such as Ca2+, Mg2+, Li+, and Na+ and good reproducibility with relative standard error of 0.81% (n = 4). The sensors were applied to the analysis of potassium in urine and the results were compared with that of a conventional technique such as flame photometry