Green fabrication of paper-based chromium (vi) detector using sugarcane bagasse and tannin-crosslinked polyethyleneimine for water quality monitoring/ Ethan Domini A. Bautista, Rochelle Ann V. Insigne, Marriane Angel A. Mandariaga, and Nathalie Joy M. Quezada.--

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Bautista, Ethan Domini A [author]

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Material type: Text

TextPublication details: Manila: Technological University of the Philippines, 2025.Description: viii, 133pages: 29cmContent type:

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BTH GF 41 B38 2025

Dissertation note: College of Science.-- Bachelor of science in environmental science: Technological University of the Philippines, 2025. Summary: Preliminary water quality assessments identified chromium (Cr) as a significant contaminant in the Pasig River, emphasizing the need for continuous and real-time monitoring. However, current detection methods are costly, complex, and require technical expertise, limiting them to centralized laboratories. This study developed a low-cost,rapid, and portable method for selective Cr(VI) detection using sugarcane bagasse (SCB) and tannin-crosslinked polyethylenimine (TA-PEI) by using the color-changing complex instigated by the reduction of Cr(VI) in solutions as a colorimetric standard used to quantify chromium concentrations. After product optimization and comparison of methods, the colorimetric data collected from known Cr(VI) solutions yielded a strong linear regression with R2=0.9865 using the Eluate method, demonstrating a proportional relationship between blue channel intensity (IB) and Cr(VI) concentration. The selectivity of the chromogenic agent was also validated through tests with copper (Cu) and the organic pollutant nonylphenol, which showed no significant interference with Cr adsorption or the resulting color intensity changes. In field testing, the eluate method amounted to an estimated Cr concentration of 0.0724 ppm; while not yet validated for field deployment, the results provide a reliable foundation for laboratory simulations. Moreover, the PEI-TA- coated SCB showed excellent adsorption of Cr in lower concentrations, with a 76% Cr adsorption in 0.5 ppm solution and an adsorption capacity of 2.45 mg/g, all in consistent conditions and a pH value of 3. Additionally, the conducted community survey findings indicate that although awareness of environmental monitoring and stewardship is limited, residents are receptive to sustainable practices and open to adopting the detection method developed in the study.

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Item type	Current library	Shelving location	Call number	Copy number	Status	Date due	Barcode
Bachelor's Thesis COS	TUP Manila Library	Thesis Section-2nd floor	BTH GF 41 B38 2025 (Browse shelf(Opens below))	c.1	Not for loan		BTH0006338

Bachelor's thesis

College of Science.--
Bachelor of science in environmental science: Technological University of the Philippines,
2025.

Includes bibliographic references and index.

Preliminary water quality assessments identified chromium (Cr) as a significant
contaminant in the Pasig River, emphasizing the need for continuous and real-time
monitoring. However, current detection methods are costly, complex, and require technical
expertise, limiting them to centralized laboratories. This study developed a low-cost,rapid,
and portable method for selective Cr(VI) detection using sugarcane bagasse (SCB) and
tannin-crosslinked polyethylenimine (TA-PEI) by using the color-changing complex
instigated by the reduction of Cr(VI) in solutions as a colorimetric standard used to quantify
chromium concentrations. After product optimization and comparison of methods, the
colorimetric data collected from known Cr(VI) solutions yielded a strong linear regression
with R2=0.9865 using the Eluate method, demonstrating a proportional relationship
between blue channel intensity (IB) and Cr(VI) concentration. The selectivity of the
chromogenic agent was also validated through tests with copper (Cu) and the organic
pollutant nonylphenol, which showed no significant interference with Cr adsorption or the
resulting color intensity changes. In field testing, the eluate method amounted to an
estimated Cr concentration of 0.0724 ppm; while not yet validated for field deployment,

the results provide a reliable foundation for laboratory simulations. Moreover, the PEI-TA-
coated SCB showed excellent adsorption of Cr in lower concentrations, with a 76% Cr

adsorption in 0.5 ppm solution and an adsorption capacity of 2.45 mg/g, all in consistent
conditions and a pH value of 3. Additionally, the conducted community survey findings
indicate that although awareness of environmental monitoring and stewardship is limited,
residents are receptive to sustainable practices and open to adopting the detection method
developed in the study.

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