We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Microplastic contamination in the Karnaphuli River, Bangladesh: a case study of exposure pathways in data-scarce tropical river systems
AI summary Read the abstract
Researchers reviewed existing studies on plastic pollution in Bangladesh's Karnaphuli River, a heavily industrialized waterway, and found tiny plastic bits (microplastics) from textile factories and city waste building up in the water and sediment, where fish eat them. Because local communities regularly eat small whole fish and dried fish from this river, people may be swallowing these plastics too, and lab studies suggest the plastics could also leak harmful chemicals once inside the digestive system. More research is needed to know exactly how much exposure people are getting, but this river may be a hotspot worth watching.
ABSTRACT Graphical summary of microplastic pollution in the Karnaphuli River. It illustrates sources such as industrial discharge, municipal waste, and urban runoff, transport through water and sediments, ingestion by fish, and human exposure through fish consumption, highlighting a source-to-human pathway. Microplastic (MP) pollution is an emerging environmental concern in the Global South, yet its implications for human exposure remain insufficiently understood. This study presents a systematic literature review following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, applying a Source–Pathway–Receptor (SPR) framework to synthesize current evidence on MP occurrence, transport, and biological uptake in the Karnaphuli River, a highly industrialized system in Bangladesh. Available studies consistently report a predominance of synthetic fibres and fragments, largely associated with textile discharge, municipal wastewater, and urban runoff. Spatial evidence suggests downstream accumulation, with estuarine zones functioning as important depositional environments. The synthesis indicates that both the water column and sediments act as key pathways facilitating MP ingestion by freshwater and estuarine fish. In the local context, the consumption of small indigenous species and dried fish (Shutki), often eaten whole, represents a plausible route of human exposure. Experimental studies further suggest that MPs may release associated chemical additives under gastrointestinal conditions, indicating the potential for combined physical and chemical exposure. Despite increasing research since 2022, significant gaps remain, particularly in freshwater fish data and quantitative exposure assessment. Overall, the Karnaphuli River basin may represent a potential MP exposure hotspot, highlighting the need for source-level mitigation and integrated environmental–health research.
More Papers Like This
Microplastics pollution in the river Karnaphuli: a preliminary study on a tidal confluence river in the southeast coast of Bangladesh
AI summary Read the abstract
Researchers found high concentrations of microplastics in the surface water and sediments of Bangladesh's Karnaphuli River, with downstream areas showing the greatest abundance, fibers as the dominant type, and polyethylene terephthalate as the most common polymer.
Microplastic Pollution in Bangladesh: A Structured Review of Sources, Impacts, and Policy Responses
AI summary Read the abstract
This review pulls together existing research on microplastic pollution in Bangladesh's rivers, lakes, and coastal waters, showing that tiny plastic fragments from textiles, industry, and everyday waste are building up in water and food sources like fish. Since people are exposed to microplastics mainly by eating contaminated food (and possibly breathing them in), this matters because it means plastic pollution isn't just an environmental issue, it's likely entering our bodies through the food chain. The authors call for stronger policies, like banning single-use plastics and improving waste management, to reduce this exposure before more is understood about its long-term health effects
Microplastic contamination in fish and surface water from Dhaleshwari river, Dhaka, Bangladesh
AI summary Read the abstract
Scientists found tiny plastic bits (mostly plastic fibers thinner than a millimeter) in both the water and the fish of Bangladesh's Dhaleshwari River, with every single sample tested coming back contaminated. Since people in the area rely on this river for fish and water, these findings raise concerns about how much plastic might be ending up on our plates — though more research is still needed to figure out exactly what that means for our health.
Microplastic pollution in two industrial locations of the Karnaphuli River, Bangladesh: insights on abundance, types, and characteristics
AI summary Read the abstract
Researchers surveyed microplastic pollution in surface water at two industrial sites along the Karnaphuli River in Bangladesh, finding significant contamination with fibers being the most common type. The study suggests that industrial activity is a major contributor to microplastic pollution in this river system, with polymer types and concentrations varying between the two locations.
Assessing the Health of Karnaphuli River, Bangladesh: A Comprehensive Study of Macro Plastic Pollution, Water Quality, and Community Perspectives
AI summary Read the abstract
This multidisciplinary study of the Karnaphuli River in Bangladesh found strong correlations between organic pollution indicators (BOD and COD) and identified urban and commercial zones as dominant contributors to macro plastic accumulation. A community survey revealed that while most residents were aware of river pollution, only a small fraction recognized health risks or trusted government responses, underscoring the need for improved waste management and public education.
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.