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Microplastic Abundance and Distribution in the Sediment of Cagayan de Oro River, Philippines
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Researchers investigated microplastic contamination in sediments along the Cagayan de Oro River in the Philippines, one of the country's top plastic-emitting rivers. The study found that all sampling locations were contaminated, with the highest concentrations near the river mouth where it meets the ocean. The most common microplastics were blue-colored polyethylene fibers, and concentrations increased from upstream to downstream, confirming that rivers are significant pathways for microplastics entering marine environments.
Microplastics (MPs), or plastic particles smaller than 5 mm, are emerging contaminants that potentially affect aquatic species and humans. More research has been undertaken in the marine environment; however, rivers that serve as a sink and pathways for plastic entering the ocean have received less attention. The current study investigated the presence of MPs in the sediments of the Cagayan de Oro River, one of the top plastic-emitting rivers listed in the Philippines. Sediment samples were collected from the six sampling stations from upstream to downstream using a Van Veen grab sampler. Through stereomicroscope and Fourier-transform infrared spectroscopy (FTIR), MPs were analyzed and categorized according to color, shape, size, and polymer type. All the sampling stations were contaminated with MPs ranging from 4.4 ± 2.57 to 33.3 ± 4.44 items/kg. The highest density of MPs was found close to the river mouth that drains into Macajalar Bay which suggests that riverine contributions are substantial contributory to MPs contamination in the marine environments. Prevalent types of MPs are blue-colored (41%), fiber-shaped (41%), 0.5–1.0 mm (43%), and polyethylene (43%) particles. Microplastic accumulation is generally higher downstream than upstream.
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Riverine Microplastic Pollution: Insights from Cagayan de Oro River, Philippines
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Scientists surveyed microplastic pollution along the Cagayan de Oro River in the Philippines, finding an average of 300 particles per cubic meter of water, dominated by fibers and blue-colored fragments. The highest concentrations were found near the river mouth, suggesting accumulation as water flows toward the coast. The study provides baseline data on microplastic contamination in an understudied region and highlights the need for more monitoring in Philippine waterways.
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Researchers documented microplastic contamination in water and sediments at five river mouths of Manila Bay in the Philippines, finding fragments and fibers as the dominant types, with polyethylene and polypropylene the most common polymers.
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Researchers investigated microplastic occurrence in the Pasig River in the Philippines, which is estimated to discharge tens of thousands of tonnes of plastic into the ocean annually. The study found microplastic particles present in river water samples, consistent with the river's role as a major global ocean plastic polluter.
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Researchers sampled river mouth waters near Borongan City in Eastern Samar, Philippines, using 30-micron nylon mesh filtration and stereomicroscopy, confirming the presence of microplastics with primary microplastics predominating. The study establishes baseline data on microplastic contamination in a previously unstudied Philippine river system.
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Microplastic fibers were found throughout coastal areas of Cagayan de Oro City in the Philippines, with the highest concentrations near river mouths and residential areas. The study highlights how urban development and poor waste management drive microplastic contamination in coastal communities.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.