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Spatio-Temporal Assessment of Manganese Contamination in Relation to River Morphology: A Study of the Boac and Mogpog Rivers in Marinduque, Philippines

Author

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  • Cris Edward F. Monjardin

    (School of Civil, Environmental and Geological Engineering, Mapua University, 658 Muralla St., Intramuros, Manila 1002, Philippines
    Department of Civil and Environmental Engineering, Western University, 1151 Richmond St., London, ON N6A 3K7, Canada
    Resiliency and Sustainable Development Center, Yuchengco Innovation Center, Mapua University, 658 Muralla St., Intramuros, Manila 1002, Philippines)

  • Christopher Power

    (Department of Civil and Environmental Engineering, Western University, 1151 Richmond St., London, ON N6A 3K7, Canada)

  • Delia B. Senoro

    (School of Civil, Environmental and Geological Engineering, Mapua University, 658 Muralla St., Intramuros, Manila 1002, Philippines
    Resiliency and Sustainable Development Center, Yuchengco Innovation Center, Mapua University, 658 Muralla St., Intramuros, Manila 1002, Philippines)

Abstract

This study investigates the contribution of river morphology towards the occurrence of manganese (Mn) in both sediment and surface water (SW), considering the temporal climatic and spatial conditions. The Boac and Mogpog rivers on the island province of Marinduque, Philippines, were examined in this study. These rivers are downstream of the two abandoned open mine pits at San Antonio and Tapian, where mining disasters occurred in 1993 and 1996, respectively. Field sampling programs were conducted in 2019, 2021 and 2022 to measure the Mn concentrations in sediment and SW, and the physicochemical parameters in SW during the same sampling event. Geographic Information System (GIS) tools were employed to characterize the morphology of each river, specifically river slope, river bends, sinuosity, and channel width and length. The Boac and Mogpog rivers were divided into 22 and 15 river segments, respectively, to account for spatial heterogeneity of all parameters. Correlation (r) analysis on the average Mn concentration and river morphology within each segment was performed and indicated that river bends (Boac r = 0.421, Mogpog r = 0.356) and sinuosity (Boac r = 0.403, Mogpog r = 0.352) had the highest correlation with Mn concentrations in sediment. While river slope (Boac r = 0.716, Mogpog r = 0.282) and sinuosity (Boac r = 0.505, Mogpog r = 0.257) were the highest for Mn in SW. This confirmed that the planform of the river affected the accumulation of Mn due to its effect on sediment deposition along the river and its potential to adsorb and/or desorb metals. Furthermore, the pH of SW also directly correlated with sediment Mn (r = 0.293), and inversely correlated with SW Mn (r = −0.465), which was expected as acidic water promotes the release of metals from sediments to SW. The results from this study will aid local government, environmental engineers and managers in their mitigation program through identification of the areas and segments in the river that contain the highest and the least contamination. This is to optimize financial and human resources during river system remediation and monitoring. Data and information extracted from this study are useful in other areas of similar condition.

Suggested Citation

  • Cris Edward F. Monjardin & Christopher Power & Delia B. Senoro, 2023. "Spatio-Temporal Assessment of Manganese Contamination in Relation to River Morphology: A Study of the Boac and Mogpog Rivers in Marinduque, Philippines," Sustainability, MDPI, vol. 15(10), pages 1-26, May.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:10:p:8276-:d:1150719
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    References listed on IDEAS

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    1. Mariusz Sojka & Joanna Jaskuła, 2022. "Heavy Metals in River Sediments: Contamination, Toxicity, and Source Identification—A Case Study from Poland," IJERPH, MDPI, vol. 19(17), pages 1-25, August.
    2. Fang Shen & Longjiang Mao & Runxia Sun & Jijing Du & Zhihai Tan & Min Ding, 2019. "Contamination Evaluation and Source Identification of Heavy Metals in the Sediments from the Lishui River Watershed, Southern China," IJERPH, MDPI, vol. 16(3), pages 1-14, January.
    3. Touraj Nasrabadi & Hermann Ruegner & Marc Schwientek & Jeremy Bennett & Shahin Fazel Valipour & Peter Grathwohl, 2018. "Bulk metal concentrations versus total suspended solids in rivers: Time-invariant & catchment-specific relationships," PLOS ONE, Public Library of Science, vol. 13(1), pages 1-15, January.
    4. Ronnel C. Nolos & Christine Joy M. Agarin & Maria Ysabel R. Domino & Pauline B. Bonifacio & Eduardo B. Chan & Doreen R. Mascareñas & Delia B. Senoro, 2022. "Health Risks Due to Metal Concentrations in Soil and Vegetables from the Six Municipalities of the Island Province in the Philippines," IJERPH, MDPI, vol. 19(3), pages 1-26, January.
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