000			03219nam a22003137a 4500
003			OSt
005			20250711141908.0
008			250711b |||||||| |||| 00| 0 eng d
040			_aTUPM _bEnglish _cTUPM _dTUPM _erda
050			_aBTH GF 41 _bB38 2025
100			_aBautista, Ethan Domini A. _eauthor
245			_aGreen fabrication of paper-based chromium (vi) detector using sugarcane bagasse and tannin-crosslinked polyethyleneimine for water quality monitoring/ _cEthan Domini A. Bautista, Rochelle Ann V. Insigne, Marriane Angel A. Mandariaga, and Nathalie Joy M. Quezada.--
260			_aManila: _bTechnological University of the Philippines, _c2025.
300			_aviii, 133pages: _c29cm.
336			_2rdacontent
337			_2rdamedia
338			_2rdacarrier
500			_aBachelor's thesis
502			_aCollege of Science.-- _bBachelor of science in environmental science: _cTechnological University of the Philippines, _d2025.
504			_aIncludes bibliographic references and index.
520			_aPreliminary 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.
650			_aSugarcane bagasse (SCB)
650			_aTannic acid-polyethyleneimine (TA-PEI)
650			_aColorimetric detection
700			_aInsigne, Rochelle Ann V. _eauthor
700			_aMandariaga, Marriane Angel A. _eauthor
700			_aQuezada, Nathalie Joy M. _eauthor
942			_2lcc _cBTH COS _n0
999			_c30303 _d30303