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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.
Rivers are vital water sources for humans and homes for aquatic organisms. Conversely, they are well known as the route of plastics into the ocean. Despite being the world's number one emitter of riverine plastics into the ocean, microplastics (MPs), or plastic particles less than 5 mm, in the Philippines' rivers are relatively unexplored. Water samples were collected from six sampling stations along the river channel of the Cagayan de Oro River, one of the largest rivers in Northern Mindanao, Philippines. The extracted microplastics' abundance, distribution, and characteristics were analyzed using a stereomicroscope and Fourier transform infrared spectroscopy (FTIR). The results showed a mean concentration of 300 items/m3 of MPs dominated by blue-colored (59%), fiber (63%), 0.3-0.5 mm (44%), and polyacetylene (48%) particles. The highest concentration of microplastics was recorded near the mouth of the river, and the lowest was in the middle area. The findings indicated a significant difference in MP concentration at the sampling stations. This study is the first assessment of microplastic in a river in Mindanao. The results of this study will aid in formulating mitigation strategies for reducing riverine plastic emissions.
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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.
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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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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.
Microplastics Occurrence in Surface Waters and Sediments in Five River Mouths of Manila Bay
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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.
Microscopic detection and characterization of microplastics along Rivermouths in Borongan city, Eastern Samar, Philippines
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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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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.