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Quantitative Assessment of Aquatic Microplastic Pollution in an Urban Drainage System of Pakistan
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Scientists tested water from a heavily polluted drainage canal in Lahore, Pakistan, and found extremely high levels of microplastics, tiny plastic fragments and fibers, at every single site they checked, with concentrations far exceeding those found in most rivers and lakes worldwide. Since this contaminated water eventually flows into the Ravi River, a major source of drinking and irrigation water downstream, this pollution could end up in food and water supplies, highlighting an urgent need for better waste management and plastic pollution controls in urban areas.
Urban drainage systems are increasingly recognized as significant routes for the transport of MPs from land sources to water ecosystems. Hudiara drain is one of the most contaminated drainage systems and its tributary in Lahore (Pakistan), the Rohi drain takes in municipal, industrial, urban run off and solid waste before it flows into River Ravi and other downstream freshwater bodies. Despite numerous studies on contaminants in the Hudiara drain, data regarding microplastic pollution is scare. The current study thus examined the presence, quantity, and characteristics of MPs at eight sites along the Rohi drain to assess its function as a microplastic transport pathway. After chemical digestion and filtration, water samples were examined through brightfield microscopy, fluorescence microscopy, and Fourier Transform Infrared Spectroscopy (FTIR). Our results demonstrate that MPs were found at every sampling location, with average concentrations surpassing 2,500 MPs L⁻1. The predominant microplastic type was transparent polyethylene fiber and thread-like particles, with the majority falling within the 0.1–5 mm size range. A comparison with earlier documented data from freshwater ecosystems in Pakistan, such as rivers, lakes, and coastal areas, alongside global research on urban drainage and wastewater systems, showed that Hudiara drain has significantly greater microplastic pollution than numerous aquatic environments globally. The high level of microplastic pollution demonstrates an alignment with the drain's severely contaminated status and its exposure to ongoing human activities throughout its path. This research recognizes the Hudiara drainage network as a microplastic transport pathway in the Ravi River watershed and offers foundational data to aid in the future monitoring and pollution reduction efforts in urban areas.
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Researchers conducted the first investigation of microplastic pollution in the urban freshwater systems of Lahore, Pakistan, sampling surface water and sediments from drains and canals of the Ravi River and finding highest microplastic concentrations in heavily polluted sullage carriers.
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Researchers measured microplastic pollution in surface water around Lahore, Pakistan, and examined its effects on local wading birds. The Ravi River had the highest contamination, with over 5,000 particles per cubic meter, and birds living near these waters showed tissue damage in multiple organs. This study demonstrates that microplastic pollution in urban waterways can harm wildlife and may indicate broader risks for communities relying on these water sources.
Microplastics in urban wastewater: A vector for chemical and biological pollutants with emerging health risks
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Researchers found huge amounts of microplastics in city wastewater in Faisalabad, Pakistan, and discovered these tiny plastic bits act like magnets for toxic heavy metals (like lead and arsenic) and disease-causing bacteria. This matters because it means microplastics aren't just plastic pollution on their own, they're hitching a ride for other harmful contaminants, potentially making wastewater more dangerous to human health than previously thought, especially in cities with poor plastic waste management.
Integrated analysis of microplastics and heavy metals in the urban aquatic environment
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Scientists found tiny plastic pieces called microplastics in a polluted canal in Pakistan, and these plastics were carrying dangerous heavy metals like arsenic and lead through the water. The plastic pieces act like tiny taxis, picking up and transporting these toxic metals to new places, which makes the water even more harmful to drink or use. This matters because it shows how plastic pollution can make water contamination worse by spreading dangerous chemicals that can harm human health.
Plastic driven pollution in Pakistan: the first evidence of environmental exposure to microplastic in sediments and water of Rawal Lake
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This study provides the first evidence of microplastic contamination in a freshwater body in Pakistan, examining surface water and sediments of Rawal Lake near Islamabad. Researchers found microplastics in both water and sediment samples, with fibers and fragments being the most common types, composed primarily of polyethylene, polypropylene, and polyester. The study suggests that high population density, improper waste disposal, and recreational activities are the main drivers of contamination.
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