2022/10/10 by Ganesh S. Nhivekar, Sourabh R. Jagdale, Santosh Kamble +3 · 1 voice
Chemistry · Engineering · #Biosensors and Analytical Detection #Gas Sensing Nanomaterials and Sensors #Various Chemistry Research Topics
paper · doi:10.1021/acs.jchemed.2c00372
openalex publication_date 2022/10/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
High Resolution Image Download MS PowerPoint Slide In this work, we have developed a versatile three-in-one single beam visible colorimeter for undergraduate laboratory courses. The battery and mains electricity supply (utility power), wired and wireless data logging, and 3D-printed components are three important highlights of the developed visible colorimeter. The system is based on a low-cost ARDUINO UNO microcontroller and can measure the absorbance of the liquid samples in the visible region of the electromagnetic spectrum. For on-field measurements, the present colorimeter can work on a small 9 V battery. Therefore, the present portable colorimeter can be used for different field studies. In addition to this, the system can also work on a mains electricity supply for benchtop measurements. The measurement results can be displayed on an OLED display or can be recorded using an open-source data acquisition tool on personal computers/laptops. In addition to this, measured data can be transmitted using a Bluetooth module to Android phones. For this, an open-source Android application was developed using the MIT App Inventor web application. For rapid prototyping of the system, all components of the visible colorimeter are designed and developed using 3D-printing technology. The functioning of the colorimeter was tested by measuring the absorbance of aqueous KMnO 4 and K 2 Cr 2 O 7 samples, and experimental results were compared with the commercially available single beam visible colorimeter. The measurement difference between the present colorimeter and commercial spectrophotometer was less than 4%, suggesting the satisfactory performance of the colorimeter. Therefore, students can use the present system to understand some basic concepts of the colorimeter.