249 Emerging Contaminants: Geochemical Insights and Impacts on Human and Environmental Health

This session addresses advanced detection techniques, ecological impact assessments, and innovative remediation strategies for emerging contaminants focusing on safeguarding geohealth and ensuring sustainable protection of ecosystems and human health.

Wednesday, 22 October 2025
8:00 AM - 12:00 PM
HBGCC, 302A

Modeling the Relationship Among Environmental Variables and Microplastic Pollution in a Freshwater Stream Across an Annual Cycle

Paper number: 249-2
Program: Technical Sessions
Time: 8:30 AM – 8:45 AM

Authors

Abstract

In this study, we use a stepwise selection model to determine the correlation between a suite of environmental variables and microplastics concentrations in Plum Run, a stream within the Chester County Watershed. Approximately 62 water column samples were collected in duplicate across an annual cycle. Microplastic particles were isolated from each sample and quantified through light microscopy. Polymer types were identified using Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDS) and Fourier Transform Infrared Spectroscopy (FTIR). Results show high variability in counts, even within same-day sampling (mean= 9.34 particles L-1, n = 57, 1σ = 26.070 particles/5L). The model found a significant correlation between higher microplastic counts and colder months (p = 0.000986) and stronger wind gusts (p = 0.067071), suggesting these environmental factors enhance the transport of microplastics into waterways. Qualitative data from EDS and FTIR spectra indicate that polyester fibers comprise the majority of microplastic pollution in Plum Run. From this, we infer that increased laundering and shedding of synthetic clothing during winter is the primary reason for higher pollution in winter months. While our results highlight a preliminary link, further quantitative studies are essential to further our understanding of environmental factors in transporting microplastics from air to water systems. As a mitigation strategy, choosing natural fiber clothing, such as cotton, and air-drying laundry can help reduce fiber release into the environment.  

Geological Society of America Abstracts with Programs. Vol. 57, No. 6

doi: 10.1130/abs/2025AM-413648

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