1. Novel reagentless paper-based screen-printed electrochemical sensor to detect phosphate
- Author
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Daria Talarico, Fabiana Arduini, Danila Moscone, Stefano Cinti, Giuseppe Palleschi, Cinti, S, Talarico, D, Palleschi, G, Moscone, D, and Arduini, F
- Subjects
Analyte ,paper-based electroanalytical platform ,Nanotechnology ,02 engineering and technology ,Standard solution ,reagentless ,01 natural sciences ,Biochemistry ,Analytical Chemistry ,screen-printed electrodes ,Environmental Chemistry ,Settore CHIM/01 - Chimica Analitica ,Spectroscopy ,phosphate ,wax-printing ,Detection limit ,Filter paper ,Chemistry ,010401 analytical chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Electrochemical gas sensor ,Linear range ,Reagent ,Electrode ,user-friendly method ,0210 nano-technology - Abstract
Herein we describe a novel reagentless paper-based electrochemical phosphate sensor, manufactured with a simple and inexpensive approach. By following three easy steps, consisting of wax patterning, paper chemical modification, and electrode screen-printing, the filter paper provides an effective electroanalytical platform to sense phosphate ions in standard solutions and real samples (river water). The electrochemical properties of the paper-based platform were evaluated, firstly, by using ferricyanide as a redox mediator, proving no analyte-entrapment due to the cellulose lattice. Then, the reference colorimetric method for phosphate ions, which is based on the formation of phosphomolybdic complex, was successfully adapted to a reagentless electrochemically paper-based platform. This novel and highly sustainable configuration readily allows for the determination of phosphate ions with high reproducibility and long storage stability, achieving a detection limit of 4 μM over a wide linear range up to 300 μM. This in-house approach would be able to generically develop an affordable in situ and user-friendly sensing device without the addition of any reagent, to be applied for a broad range of analytes.
- Published
- 2016