Paper-Based Potentiometric Ion Sensing

QC 20150921
This paper describes the design and fabrication of ion-sensing electrochemical paper-based analytical devices (EPADs) in which a miniaturized paper reference electrode is integrated with a small ion-selective paper electrode (ISPE) for potentiometric measurements. Ion-sensing EPADs use printed wax barriers to define electrochemical sample and reference zones. Single-layer EPADs for sensing of chloride ions include wax-defined sample and reference zones that each incorporate a Ag/AgCl electrode. In EPADs developed for other electrolytes (potassium, sodium, and calcium ions), a PVC-based ion-selective membrane is added to separate the sample zone from a paper indicator electrode. After the addition of a small volume (less than 10 μL) of sample and reference solutions to different zones, ion-sensing EPADs exhibit a linear response, over 3 orders of magnitude, in ranges of electrolyte concentrations that are relevant to a variety of applications, with a slope close to the theoretical value (59.2/z mV). Ion-selective EPADs provide a portable, inexpensive, and disposable way of measuring concentrations of electrolyte ions in aqueous solutions.

Ingår i:Analytical Chemistry: American Chemical Society (ACS)86:19, s. 9548-95530003-27001520-6882

Av författaren/redakt...: Lan, Wen-Jie; Zou, Xu U.; Hamedi, Mahiar; Hu, Jinbo; Parolo, Claudio; Maxwell, E. Jane; visa fler...; Bühlmann, Philip ...; Whitesides, Geor ...; visa färre...

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