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Microplastic pollution and textural characteristics of sediments in a tropical reservoir, Kerala, India
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Researchers found high levels of microplastics, including hazardous PVC particles, buried in the sediment of a Kerala reservoir that serves as a major drinking water source for the region. The muddy, clay-like texture of the reservoir floor traps these plastic particles rather than flushing them away, meaning pollution builds up over time from nearby waste dumping. This matters because contaminated water sources could put microplastics into the drinking water supply, highlighting the need for better waste management to protect public health.
Microplastic pollution is now recognised as a severe environmental issue affecting aquatic habitats. Although initially buoyant, microplastics can undergo vertical transport through the water column, eventually settling and accumulating in benthic sediments. The goal of this research is to evaluate microplastic pollution in the benthic sediments of a tropical reservoir, Aruvikkara, one of the primary water sources in Kerala, South India. This study also evaluates sediment texture as a primary determinant of microplastic retention in benthic layers. Identification of microplastic polymers in reservoir sediments was carried out using FTIR/Raman spectroscopy, and the Pollution Load Index (PLI), Polymer Hazard Index (PHI), and Potential Ecological Risk Index (PERI) were calculated. The reservoir is categorised as 'High-Risk' and 'Hazard Level III' due to its critical poly vinyl chloride levels. Municipal waste dumping and other human activities can be correlated with microplastic contamination in the reservoir. The textural analysis of the reservoir sediment revealed that it is silty clay, which contributes to microplastic accumulation and retention. The study reveals that reservoir sediments can act as sinks for microplastics. These results mandate stringent municipal waste management and reservoir protection measures to restrict the reservoir contamination and safeguard the region's primary potable water source.
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Scientists studying a drinking-water reservoir in India found tiny plastic particles (microplastics) in the water, mud, and fish year-round, with levels shifting depending on rainy vs. dry seasons. These plastics carried harmful chemicals and heavy metals, and since fish from this reservoir are eaten and the water is used for drinking, this raises real concerns about how much plastic and toxic material people may be consuming without realizing it. The findings highlight the need for better water treatment and plastic waste management to protect public health.
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Researchers assessed microplastic contamination in Vellayani Lake, a major drinking water source in southern India, and found particles present across all sampling sites and seasons. Fibers were the most common shape, with polyethylene and polypropylene as the dominant polymer types, likely originating from domestic wastewater and fishing activities. The study highlights the need for monitoring microplastic pollution in freshwater lakes that serve as critical drinking water supplies.
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Scientists found tiny plastic particles called microplastics in all four major reservoirs that supply drinking water in Turkey's Ceyhan River Basin, with concentrations ranging from about 10-15 particles per liter of water. Surprisingly, these plastic particles were most concentrated at the bottom of the reservoirs rather than floating on the surface, meaning current monitoring methods that only check surface water may be missing the full extent of contamination. This matters because these reservoirs provide drinking water to communities, and we're still learning about the long-term health effects of consuming microplastics.
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