Development of an Optofluidic System for Concentration Measurement of Colorimetric Based Solution Targeted For Water Quality Assessment

• Published in: Proceedings of the World Congress on Electrical Engineering and Computer Systems and Science
• Main Author: Robi F.I.M.; Dali M.R.M.; Azhar N.I.D.N.; Sulaiman M.S.; Ahmad K.A.; Yahaya S.Z.; Rahman M.F.A.
• Format: Conference paper
• Language: English
• Published: Avestia Publishing 2023
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85180626525&doi=10.11159%2feee23.113&partnerID=40&md5=d3a58ea6a55ea685bcaa5b40cefc6aa2

Concentration measurement of a solution based on colorimetric method is normally performed using a commercial and bulky device such as colorimeter and spectrometer. This approach has several drawbacks: the sample needs to be manually taken, transported and tested in laboratory, as well as it requires large volume of analyte and reagent. Such problem can be overcome by having a small and compact system such as optofluidic based device with the capability of carrying out colorimetric measurements with better operational processes. Therefore, this research focuses on the development of a smaller optofluidic based system to measure the concentrati on of colorimetric based solutions. The system consists of a microfluidic platform combined with a light emitting diode (LED) and a light-dependent resistor (LDR) as its optical source and detector, respectively. Based on Beers law principles, different concentration of coloured solution produces different voltage signal and absorbance effect, which is then being processed and manipulated to produce the concentration measurement. The optofluidic system was then tested on colorimetric solution between 0.1M to 1M and gives linearity coefficient, R2 of 0.9977 and 0.9979 for its voltage and absorbance, respectively. The proposed optofluidic system is targeted to be able to measure the concentration of particles in colorimetric solution and to be implemented for colorimetric based water quality assessment. © 2023, Avestia Publishing. All rights reserved.