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Sensors 2018, 18(3), 818;

A Miniaturized Colorimeter with a Novel Design and High Precision for Photometric Detection

Institute of Microelectronics, Tsinghua University, Beijing 100084, China
Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China
Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
Central Institute of Technology (CEITEC), Brno University of Technology, Purkynova 123, 61200 Brno, Czech Republic
Author to whom correspondence should be addressed.
Received: 2 December 2017 / Revised: 1 February 2018 / Accepted: 9 February 2018 / Published: 8 March 2018
(This article belongs to the Special Issue Colorimetric Nanosensors)
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Water quality detection plays an increasingly important role in environmental protection. In this work, a novel colorimeter based on the Beer-Lambert law was designed for chemical element detection in water with high precision and miniaturized structure. As an example, the colorimeter can detect phosphorus, which was accomplished in this article to evaluate the performance. Simultaneously, a modified algorithm was applied to extend the linear measurable range. The colorimeter encompassed a near infrared laser source, a microflow cell based on microfluidic technology and a light-sensitive detector, then Micro-Electro-Mechanical System (MEMS) processing technology was used to form a stable integrated structure. Experiments were performed based on the ammonium molybdate spectrophotometric method, including the preparation of phosphorus standard solution, reducing agent, chromogenic agent and color reaction. The device can obtain a wide linear response range (0.05 mg/L up to 7.60 mg/L), a wide reliable measuring range up to 10.16 mg/L after using a novel algorithm, and a low limit of detection (0.02 mg/L). The size of flow cell in this design is 18 mm × 2.0 mm × 800 μm, obtaining a low reagent consumption of 0.004 mg ascorbic acid and 0.011 mg ammonium molybdate per determination. Achieving these advantages of miniaturized volume, high precision and low cost, the design can also be used in automated in situ detection. View Full-Text
Keywords: colorimeter; phosphorus detection; Beer-Lambert law; microflow cell; photodetection sensor colorimeter; phosphorus detection; Beer-Lambert law; microflow cell; photodetection sensor

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yan, J.-C.; Chen, Y.; Pang, Y.; Slavik, J.; Zhao, Y.-F.; Wu, X.-M.; Yang, Y.; Yang, S.-F.; Ren, T.-L. A Miniaturized Colorimeter with a Novel Design and High Precision for Photometric Detection. Sensors 2018, 18, 818.

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