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Identification and Characterization of Microplastics in Freshwater Systems: a Close Look at the Poquessing Creek- a Delaware River Tributary
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Scientists sampled a Pennsylvania creek tributary to the Delaware River and found microplastics at all sampling locations, with fibers and fragments being the most common types. Urban freshwater systems routinely carry microplastics that can accumulate in drinking water sources downstream.
Microplastics are accumulating at an alarming rate in waterways all around the world. While marine microplastics have been studied extensively, the distribution, concentration, and characteristics of microplastics in freshwater systems are not well understood. Understanding the presence of microplastics in freshwater is essential for studying their impacts to water resources, human health, and aquatic health. The scientific community is finding that microplastics can carry and release persistent organic pollutants (POPs) and endocrine disruptor chemicals (EDCs) in water, but it is difficult to assess their impacts without having baseline information about their presence in freshwater systems. This research is a step towards identifying and characterizing the types of microplastics present in freshwater systems such as the Delaware River and its tributaries. In this study, surface water samples were collected in the Poquessing Creek via grab sampling. The samples were then purified using the Fenton reaction paired with density separation and analyzed using Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). The procedure revealed information on the morphology and composition of microplastics present in the Poquessing Creek. Analysis of samples from the lower, tidal portion of the Poquessing Creek revealed 63 microplastics in the form of fibers, fragments, films, and flakes having variable composition including polyester, polyethylene, and polypropylene. Complete quantification of microplastics was not possible due to the heterogeneity of microparticles present throughout the samples. This research begins to close the knowledge gap on the presence of microplastics in freshwater systems and also attempts to standardize sampling and analysis techniques for assessing freshwater microplastics. Since the types and composition of microplastics in freshwater systems can be characterized, researchers can move towards identifying and assessing their impacts on water resources, human health, and aquatic health.
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Researchers developed and tested novel sampling and multi-analytical methods including SEM-EDX and FTIR spectroscopy to characterize microplastics in Philadelphia's Delaware and Schuylkill Rivers, aiming to standardize freshwater microplastic methodology. Their work provides foundational data on concentrations, morphology, and elemental composition of freshwater microplastics to support future human and environmental health assessments.
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Researchers quantified and characterized microplastic contamination across waterways in the Greater Philadelphia region, examining how plastic degradation from weathering, heat, water, and biological activity introduces microplastics into local water bodies and the atmosphere. The study assessed the scope of contamination and documented the implications of microplastic pollution for aquatic and human health in an urban watershed context.
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Microplastic concentrations in a small New York tributary stream surged to 125 particles per cubic meter during high-flow conditions—roughly ten times the low-flow baseline—correlating with storm drain inflow and sewage leakage. This demonstrates that rainfall events dramatically amplify microplastic transport from urban infrastructure into waterways, with implications for downstream river and drinking water contamination.
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Researchers investigated microplastic prevalence in the Catawba River Basin of North Carolina by collecting 80 water samples across five sites varying in recreation intensity and upstream/downstream position, finding microplastics present in every sample collected and documenting higher concentrations at downstream and recreated sites.
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Researchers measured microplastic concentrations in a freshwater river used for recreational purposes and found a significant relationship between microplastic abundance and water physicochemical quality parameters, along with the presence of three organic compounds, providing evidence that microplastic pollution and water quality are closely linked.
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