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Article

Variation in Dissolved Organic Matter Using Absorbance and Fluorescence Measurements during Dry Season in Sta. Rosa and Cabuyao Rivers, Philippines

1
Environment And RemoTe sensing researcH (EARTH) Laboratory, Physics Department, College of Science, De La Salle University Manila, Taft Avenue, Manila 0922, Philippines
2
Division of Physical Sciences and Mathematics, College of Arts and Sciences, University of the Philippines Visayas-Miagao Campus, Miagao 5023, Philippines
3
Chemical Engineering Department, Gokongwei College of Engineering, De La Salle University Manila, 2401 Taft Avenue, Manila 1004, Philippines
*
Author to whom correspondence should be addressed.
Academic Editor: Katarzyna Kowalczewska-Madura
Water 2022, 14(9), 1444; https://doi.org/10.3390/w14091444
Received: 7 April 2022 / Revised: 26 April 2022 / Accepted: 27 April 2022 / Published: 30 April 2022
(This article belongs to the Special Issue Water Quality Changes of Lakes and Rivers)
Santa Rosa watershed, where the Santa Rosa River and Cabuyao River are located, is growing with increasing urbanization and commercialization in their surroundings. Water quality monitoring is an important tool in understanding the possible impacts of domestic, industrial, and commercial discharges, and agricultural run-off on river systems and their tributaries. With the integration of absorbance and fluorescence measurements, we can further examine the effects of land use and climate change on dissolved organic matter (DOM) sources found in river systems. In this study, these two rivers exhibit poor quality with varying values in each sampling station and period. DOM sources change from terrestrial to endogenous sources within the sampling period. High aromaticity and molecular size were observed in all downstream sampling stations. This is supported by the high values of humic-like substances. Fluorescence index values showed temporal changes from terrestrial to endogenous DOM sources from November 2019 to February 2020. This is also confirmed by the increasing trend in the biological index. The variation in all sampling stations can be attributed to varying land use, hydrological, and climatological changes such as typhoon Tisoy, and Taal Volcano eruption observed during the sampling period. View Full-Text
Keywords: laguna watershed; water quality monitoring; absorbance; fluorescence; land use laguna watershed; water quality monitoring; absorbance; fluorescence; land use
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MDPI and ACS Style

Cadondon, J.G.; Vallar, E.A.; Beltran, A.B.; Orbecido, A.H.; Galvez, M.C.D. Variation in Dissolved Organic Matter Using Absorbance and Fluorescence Measurements during Dry Season in Sta. Rosa and Cabuyao Rivers, Philippines. Water 2022, 14, 1444. https://doi.org/10.3390/w14091444

AMA Style

Cadondon JG, Vallar EA, Beltran AB, Orbecido AH, Galvez MCD. Variation in Dissolved Organic Matter Using Absorbance and Fluorescence Measurements during Dry Season in Sta. Rosa and Cabuyao Rivers, Philippines. Water. 2022; 14(9):1444. https://doi.org/10.3390/w14091444

Chicago/Turabian Style

Cadondon, Jumar G., Edgar A. Vallar, Arnel B. Beltran, Aileen H. Orbecido, and Maria C.D. Galvez. 2022. "Variation in Dissolved Organic Matter Using Absorbance and Fluorescence Measurements during Dry Season in Sta. Rosa and Cabuyao Rivers, Philippines" Water 14, no. 9: 1444. https://doi.org/10.3390/w14091444

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