RGB-based colorimetric method for the analysis of water alkalinity using Cordyline fruticosa extracts as visual indicator

Christian Alex C. Parungao, Darwin F. Reyes


Leaf extracts of Cordyline fruticosa was used as a natural visual indicator for a digital image-based analytical procedure for the measurement of water alkalinity. A smartphone and ImageJ were used to capture and process the images, respectively. This work sought to develop and evaluate a greener strategy of using of Cordyline fruticosa leaf extract as natural indicator, in a digital image-based colorimetric set-up using smartphone. Under optimized conditions, the linear working range was from 40 to 160 ppm of CaCO3, with a calibration sensitivity of 5 x 10-3 ppm and a coefficient of correlation (r2)=0.998. The limit of detection and quantification were 39 ppm and 117 ppm, respectively. A 10,000 ppm CaCO3 solution was tested using the proposed method and the results statistically agree with the results obtained from titrimetric methods. The study presented a simple analytical procedure that can be develop and apply for the assessment of pollution that could pose serious human and environmental health hazards.

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DOI: http://doi.org/10.11591/ijphs.v13i1.23211


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International Journal of Public Health Science (IJPHS)
p-ISSN: 2252-8806, e-ISSN: 2620-4126

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