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A miniaturized 3D-printed device has been designed, manufactured and validated to perform as a low-cost sensor for compositional analysis of buffered and non-buffered solutions in industrial or remote areas. The proposed sensor takes advantage of the transport phenomenon and colorimetric measurements. The novel design can simultaneously detect the ionic strength of the solution by measuring the diffusion width of the ions and the pH by image analysis of the pH indicator color change. The results showed that it can detect pH variations of 0.25 and ionic measure difference of 0.1 M in non-buffer solutions. In addition, the design showed its adaptability to be used as a self-referencing sensor. The 3D-printed sensor presented here is not only successful in the evaluation of some important chemical characteristics but also brings flexibility, cost-effectiveness, swiftness and user-friendliness. Copyright © 2020 Elsevier Ltd. All rights reserved.


Pouya Mehrdel, Shadi Karimi, Josep Farré-LLadós, Jasmina Casals-Terré. Portable 3D-printed sensor to measure ionic strength and pH in buffered and non-buffered solutions. Food chemistry. 2021 May 15;344:128583

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PMID: 33257025

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