A PORTABLE SPECTROPHOTOMETER WITH A VISIBLE LIGHT AS RADIATION SOURCE FOR ACID-BASE CONCENTRATION MEASUREMENTS

Mona Berlian Sari; Widya Anisa; Anggun Sisri Br Matondang; Muhammad Akbar Andi Arif

doi:10.24036/w9crvk35

Authors

Mona Berlian Sari Department of Physics, Universitas Negeri Padang, Jl. Prof. Dr. Hamka Air Tawar Padang 25131, Indonesia Author
Widya Anisa Department of Physics, Universitas Negeri Padang, Jl. Prof. Dr. Hamka Air Tawar Padang 25131, Indonesia Author
Anggun Sisri Br Matondang Department of Physics, Universitas Negeri Padang, Jl. Prof. Dr. Hamka Air Tawar Padang 25131, Indonesia Author
Muhammad Akbar Andi Arif Department of Smart Agricultural System, Chungnam National University, Daejeon 34134, South Korea Author

DOI:

https://doi.org/10.24036/w9crvk35

Keywords:

acid-base, concentration , radiation, sensor, spectrophotometer

Abstract

Acidity concentration measurement is a rigorous step throughout the entire quality control of food products that must be evaluated using a strictly recognized and standardized method. One method that can be used to measure concentrations efficiently is a spectrophotometer. In this work, we developed a spectrophotometer using a photodiode sensor to measure Acid-Base concentration so-called spectABC. The spectABC has high performance and sensitivity, is cost-effective, easy to build, and easy to use. The acidic coffee powder and alkalinity of NaHCo₃ are measured as the sample in this work. The spectABC shows good performance in measurement transmittance, absorbance, and concentration of the sample. The relative error percentage of the measurement is reported to be less than 4.8% in the measurement of the coffee solution. The average percentage of accuracy is found to be 98.92%. In the measurement of NaHCo₃ concentration, the measurement error percentage is less than 4.46%. The average percentage of accuracy is found to be 97.67%. Overall measurements have consistently high accuracy which is above 97%. Detail about the work is described in this paper.

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