Determination of ethanol content in disinfectant spray by color photo intensity measuring on mobile phone

Name: Metinee Mektan

Organization : Burapha University. Faculty of Science

Name: Sasitorn Muncharoen

Organization : Burapha University. Faculty of Science

Name: Sarayut Watchasit

Organization : Burapha University. Faculty of Science

Name: Jaray Jaratjaroonphong

Organization : Burapha University. Faculty of Science

Email : jaray@buu.ac.th

LCSH: Ethanol -- Analysis

LCSH: Disinfection and disinfectants

LCSH: Colorimetry

LCSH: Analytical chemistry

Abstract: In the context of the COVID-19 pandemic, ethanol-based disinfectant formulations with a mandated minimum concentration of 70% v/v ethanol are essential for the mitigation of pathogens. This study introduces a rapid and reliable colorimetric method for measuring ethanol levels, utilizing mobile phone technology for data collection. The method involves oxidizing ethanol with a K2Cr2O7 solution for 5 minutes, then capturing color images of the reaction using a mobile phone camera. These images are subsequently analyzed using an application capable of measuring color intensity in the RGB system. The color intensity is then converted into absorbance values, enabling precise quantitative analysis. The method exhibits an impressive linear range with a commendable correlation coefficient (R2 = 0.9933) for the relationship between absorbance values and ethanol concentration (50-90% v/v). Notably, results obtained from mobile phone cameras align well with established techniques such as nuclear magnetic resonance (NMR) and UV-visible spectrophotometry, highlighting their analytical usefulness. Furthermore, this approach provides educational benefits, especially for high school chemistry labs with limited resources, by integrating digital imaging technology into teaching practices. Emphasizing portability, affordability, and rapid analysis enriches the learning experience, fostering students' proficiency in quantitative analysis techniques while demonstrating the synergy between technology and modern chemical education

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2024

Modified: 2024-11-28

Issued: 2024-11-28

บทความ/Article

application/pdf

BibliograpyCitation : In Kasetsart University. Faculty of Science. The Pure and Applied Chemistry International Conference 2024 (PACCON 2024) (pp.268-273). Bangkok : Kasetsart University, 2024

eng

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