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Assessment of microplastic pollution and polymer risk in the sediment compartment of the Limfjord, Denmark
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Scientists measured microplastic contamination across a large Danish fjord and found plastic particles at every location sampled, with concentrations up to 4,288 particles per kilogram of sediment. They applied a Polymer Hazard Index showing that certain plastic types like polyacrylonitrile and ABS pose especially high risks. The study estimates the fjord's surface sediments hold thousands of kilograms of microplastics, with potential consequences for the commercial shellfish species living there.
Estuarine sediments intercept and temporarily retain microplastics before they reach the marine seafloor, impacting various organisms, including key commercial species. This highlights the critical need for research on microplastic exposure in these transitional environments. This study provides a detailed assessment of microplastic pollution in the sediment compartment of the Limfjord, a 1500 km2 large Danish fjord, and introduces the Polymer Hazard Index (PHI) as a tool for evaluating polymer-specific risks. Thirteen sediment samples were collected, covering an anthropogenic gradient along the fjord. State-of-the-art methods were applied for extracting and identifying (FPA-μFT-IR imaging) microplastics (10-5000 μm). Our results indicate that microplastic contamination is pervasive across all sampled locations with concentrations ranging from 273 to 4288 particles kg-1, with a predominance of small microplastics (<100 μm). The estimated mass-based concentrations ranged between 2.60 × 104-1.11 × 106 ng kg-1. Overall, we estimated a microplastic stock of 3.8 × 103-1.65 × 105 kg in the surface sediments of the Limfjord, i.e., some 2.5-110 kg km-2. The application of the PHI revealed significant risks associated with specific polymers, such as polyacrylonitrile (PAN) and acrylonitrile butadiene styrene (ABS), underscoring the importance of considering polymer-specific hazards in environmental assessments.
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Investigating microsized anthropogenic particles in Norwegian fjords using opportunistic nondisruptive sampling
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Researchers investigated microscale anthropogenic particles including microplastics in Norwegian fjord sediments, an ecosystem important for fisheries and aquaculture. They found microplastic contamination at multiple fjord sites, with concentrations and composition varying by proximity to human activities. The study provides baseline data on microplastic pollution in a commercially and ecologically significant Norwegian marine environment.
Spatial distribution, characteristics, polymer composition, and ecological risk of microplastics in marine sediments of Central Vietnam
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Scientists found tiny plastic particles (microplastics) in every single seafloor sample they tested along Central Vietnam's coast, with especially high amounts in bays, tourist beaches, and fishing areas. Most concerning, the plastics weren't just numerous, many were made from chemically hazardous materials, meaning the real danger comes from what these particles are made of, not just how many there are. Since these sediments are part of the marine food chain, this pollution could eventually make its way into the seafood people eat, making this research an important early warning for tracking and reducing plastic contamination in the region.
Microplastic abundance in beach sediments of the Kiel Fjord
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Researchers assessed microplastic abundance in beach sediments at three sites in Kiel Fjord, Germany, finding plastics at all locations including one near a sewage treatment plant. The study highlights how multiple sources — recreational use, wastewater discharge, and plastic litter — contribute to microplastic accumulation in coastal sediments.
Ecological risk assessment of microplastics contamination in water, sediment and native fish species of the Brahmaputra River, India
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Researchers assessed microplastic contamination across water, sediment, and seven native fish species in the Indian stretch of the Brahmaputra River, finding water concentrations of 140–420 particles/m³ and sediment loads of 13–53 particles/kg, with polymer hazard indices reaching the highest risk category at multiple sites due to polyurethane and PVC particles—providing the first ecological risk baseline for this major Himalayan river.
Occurrence and spatial distribution of microplastics in water and sediments of Hatiya Island, Bangladesh and their risk assessment
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Researchers assessed microplastic distribution in surface water and sediments around Hatiya Island, Bangladesh, finding higher contamination in sediments than in water. Fibers were the most common type, and polymer analysis identified potentially hazardous plastics including polyurethane, polycarbonate, and polyvinyl chloride. While basic pollution indices showed minimal levels, hazard-based risk assessments indicated severe contamination due to the presence of these hazardous polymer types.
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.