Patent ID: 11874246
Assignee: UNIVERSIDAD ROVIRA I VIRGILI (URV)
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A paper-based sensor comprising a potassium ion-selective potentiometric cell capable of selectively measuring potassium and comprising a working electrode and a reference electrode, each of the working and reference electrodes comprising paper with a conductive surface, wherein the working electrode comprises a potassium ion-selective composition prepared from a first composition comprising a first carrier solvent, between 1.6 and 2.4 mg of Valinomycin per ml of the first carrier solvent, between 0.4 and 0.6 mg of potassium Tetrakis (4-chlorophenyl) borate (KTFPB) per ml of the first carrier solvent, between 52.48 and 78.72 mg of Poly(vinylchloride) (PVC) with a molecular weight between 50000-250000 g/mol per ml of the first carrier solvent, and between 103.52 and 155.28 mg of Bis(2-ethylhexyl) sebacate) (DOS) per ml of the first carrier solvent, and wherein the reference electrode comprises a composition prepared from a second composition comprising a second carrier solvent,
between 8 and 12 mg of sodium chloride per ml of the second carrier solvent, and between 94.88 mg and 142.32 mg of Butvar B-98 per ml of the second carrier solvent,
wherein Butvar B-98 is polyvinyl butyral having a molecular weight between 40000-70000 g/mol with a butyral content between 78 and 80% weight per total weight of the polyvinyl butyral (w/w), a hydroxyl content between 18 and 20% (w/w) and an acetate content less than 2.5%.