We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Microplastic contamination in coastal environments: Assessing the role of rainfall and stormwater inputs
AI summary Read the abstract
Scientists studying beaches near Adelaide, Australia found that concrete stormwater drains dump nearly twice as many microplastics (tiny plastic bits, mostly from clothing fibers and tires) into coastal waters compared to natural river mouths. This matters because these microplastics can work their way into seafood and the broader food chain, and it suggests that upgrading how cities manage stormwater runoff could be a meaningful way to cut down on plastic pollution before it reaches our oceans and, eventually, our plates.
Stormwater is increasingly recognised as a contributor to microplastic contamination in aquatic environments. Yet, the contribution of rainfall in flushing microplastics through urban drainage systems into coastal environments remains less quantified. In Australia and other urbanised areas worldwide, stormwater is discharged into coastal areas via river mouths, and directly onto beaches via concrete piped outlets. This study examined microplastic concentrations in stormwater discharged from engineered concrete outlets and natural river mouths before, during and after rain events along the Adelaide coast, South Australia. Water and sediment samples were analysed after density separation and filtration and using Fourier-Transform Infrared (μ-FTIR) spectroscopy for polymer verification. 54% of water samples and 70% of sediment samples contained microplastics. Concentrations in concrete drain waters were almost double those in rivers (1.71 ± 0.29 vs 0.91 ± 0.20 microplastics L −1 ), with sediment concentrations also significantly higher in concrete drains (0.88 ± 0.11 vs 0.72 ± 0.11 microplastics g −1 dry weight). Rainfall events showed no significant difference on microplastic concentrations, though concrete outlets showed elevated microplastic concentrations in water after heavy rainfall. Overall, fibres dominated (>80% of particles), primarily polyethylene and polyester, with tyre-derived particles also detected. This study highlights that concrete stormwater drains serve as concentrated pathways for the discharge of microplastics into coastal systems, underscoring the need to consider targeted management and mitigation strategies.
More Papers Like This
Spatiotemporal patterns, loads, and risks of microplastics in the stormwater system of a subtropical coastal city
AI summary Read the abstract
Researchers found that stormwater drains in a coastal city (Macao) are packed with tiny plastic particles—sometimes thousands per liter—that get washed off streets during rain and flow straight into the ocean, where marine life can ingest them. This matters because these microplastics eventually make their way up the food chain into the seafood we eat, and the study found the plastic types detected pose a notably high risk to ecosystems, highlighting the need for better stormwater filtering systems in cities.
Influence of Population Density and Land Use on Microplastics in Urban Stormwater Runoff
AI summary Read the abstract
Researchers found that stormwater runoff from densely populated, residential neighborhoods in a Brazilian coastal city carried far more microplastic particles, mostly tiny fibers from fabrics and rubber bits, likely from tires, than runoff from industrial or empty lots. This matters because rain washes these plastics straight into rivers and oceans, where they enter the marine food chain and, eventually, the seafood we eat, meaning where and how we build our cities directly affects plastic pollution reaching our plates.
A plastic storm: The role of stormwater in the microplastic load of an urban river system
AI summary Read the abstract
A study of an urban river system found that stormwater runoff is a major source of microplastic pollution, transporting particles from roads, buildings, and other urban surfaces directly into waterways during rain events. Stormwater contributed a significant fraction of the total microplastic load reaching the ocean, comparable to inputs from wastewater treatment plants. Better management of urban stormwater could meaningfully reduce microplastic pollution in rivers and coastal waters.
Microplastic Pollution in Stormwater: Preliminary Findings from the Oregon Coast
AI summary Read the abstract
Researchers collected stormwater samples and analyzed them for microplastic content, providing preliminary findings on particle abundance, types, and size distributions in urban stormwater runoff. The results confirm stormwater as a significant pathway for microplastics from land surfaces into receiving water bodies.
A plastic storm: The role of stormwater in the microplastic load of an urban river system
AI summary Read the abstract
Stormwater systems in urban areas were found to be a significant source of microplastics entering river systems, transporting particles from roads, buildings, and other surfaces during rainfall events. A fine-resolution study measured the types and quantities of microplastics carried by stormwater in an urban catchment, finding concentrations comparable to inputs from wastewater treatment plants. Better capture and treatment of urban stormwater is needed to reduce this largely unregulated pathway for microplastics reaching rivers and the ocean.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.