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Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
Published on: July 28, 2018
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Riverine Microplastic Pollution: Insights from Cagayan de Oro River, Philippines
Aiza D Gabriel1, Ruben F Amparado1,2, Arnold A Lubguban3,4
1Environmental Science Graduate Program, Department of Biological Sciences, Mindanao State University-Iligan Institute of Technology (MSU-IIT), Tibanga, Iligan City 9200, Philippines.
Summary
This study found high levels of microplastics (MPs) in the Cagayan de Oro River, Philippines. The research highlights the urgent need for strategies to reduce plastic pollution in rivers.
Area of Science:
- Environmental Science
- Marine Biology
- Ecotoxicology
Background:
- Rivers act as critical freshwater sources and aquatic habitats.
- Rivers are significant pathways for plastic debris entering marine environments.
- The Philippines is a major contributor of riverine plastics, yet MP pollution in its rivers remains understudied.
Purpose of the Study:
- To assess the abundance, distribution, and characteristics of microplastics in the Cagayan de Oro River.
- To provide the first assessment of microplastic pollution in a major Mindanao river.
- To inform strategies for mitigating riverine plastic emissions.
Main Methods:
- Water samples were collected from six stations along the Cagayan de Oro River.
- Microplastics were extracted and analyzed using stereomicroscopy.
- Particle characteristics were identified using Fourier transform infrared spectroscopy (FTIR).
Main Results:
- A mean concentration of 300 MPs/m³ was found.
- Blue fibers (63%) of 0.3-0.5 mm size (44%) were the dominant microplastic type.
- Polyacetylene (48%) was the most prevalent polymer, with highest concentrations near the river mouth.
Conclusions:
- Microplastic pollution is significant in the Cagayan de Oro River.
- Spatial distribution indicates the river mouth as a hotspot for MP accumulation.
- Findings provide crucial data for developing targeted plastic pollution reduction strategies in the Philippines.
