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Deconstructing Microplastic Pollution in Terrestrial and Freshwater Environs: Holistic Assessment of Source Apportionment, Polymer-driven Ecological Hazard, and Human Exposure
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Researchers studying microplastic pollution in an Indian district found that most of it comes from everyday sources like single-use plastics, household trash, and personal care products. The most eye-opening finding: people who drink lake water may be exposed to far more microplastic particles (55 per year) than those drinking river water (just 1 per year), suggesting that where your water comes from could meaningfully affect how much plastic you're unknowingly ingesting. This highlights the need for water safety monitoring to specifically account for microplastic levels, not just traditional contaminants.
Microplastics (MPs) in marine environments primarily originate from terrestrial sources, with 80% transported via river systems. This study analyzes the distribution, sources and ecological risks of MPs in the Krishnagiri District, Tamil Nadu, India. Source investigation through the Principal Component Analysis – Absolute Principal Component Scores – Multiple Linear Regression (PCA-APCS-MLR) model showed that single-use plastics and household waste contributed 60.3% of MPs in the terrestrial environment, followed by cosmetics, personal care products, and consumer goods at 23.4%, with durable long-term plastics contributing the least at 16.3%. The risk assessment indicated that the total pollution load is within Hazard level I in the Krishnagiri district. In particular, Aiyur, one of the primary seasonal Elephant corridors, exhibited a moderate to higher ecological risk, despite the lower MPs load. Multivariate Analysis of Variance (MANOVA) and Analysis of Variance (ANOVA) analysis showed that there is no significant difference between each source class to explain the pollution load, and ecological risk indices. Group membership explained 14.7% of the variation in Potential Ecological Risk Index and 7.3% in Pollution Load Index, according to partial eta-squared values, highlighting that variability within the groups was more prominent. The average human consumption of MPs was higher through lake water (55 particles/year/kg) than through river water consumption (1 particle/year/kg). Higher pollutant load in lakes elevates the probability of human exposure, potentially resulting in more significant adverse health impacts. Therefore, it is imperative that risk assessment frameworks integrate measurements like Estimated Daily Index to more effectively identify potential consumption risks.
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Microplastics in freshwater lakes: A case study from Southern India
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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.
A Critical Review on the Characterization and Distribution of Microplastic Contaminants in Indian Water Environments: Pathways and Related Hazards
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This systematic review examines microplastic contamination in India's freshwater environments, including rivers and lakes. While marine ecosystems have gotten the most attention, freshwater sources — which supply drinking water — are also heavily contaminated. The findings highlight how inadequate waste management and recycling infrastructure allow microplastics to spread through the water systems that communities depend on.
Spatial and vertical distribution of microplastics and their ecological risk in an Indian freshwater lake ecosystem
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Researchers mapped the spatial and vertical distribution of microplastics in Kodaikanal Lake, a popular tourist destination in India that also serves as a water source for downstream communities. They found microplastics in surface water, surface sediment, and deeper sediment cores, with the highest concentrations near areas of heavy tourist activity. The study highlights how human activities directly influence microplastic contamination patterns in freshwater ecosystems used for drinking water.
Microplastics pollution in inland aquatic ecosystems of India with a global perspective on sources, composition, and spatial distribution
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Researchers reviewed microplastic contamination in India's rivers, lakes, and wetlands, finding widespread pollution across water, sediment, and wildlife, with concentrations peaking during monsoon season due to runoff. The review highlights a critical gap: most studies don't account for how water flow and seasonal variation affect where microplastics go, making it hard to gauge the true health risk to people and ecosystems.
Microplastics in Indian Freshwater Systems: Current Status and Future Research Needs
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This review paper pulls together existing research on tiny plastic particles (microplastics) found in India's rivers and lakes, highlighting how widespread they've become in freshwater systems that many people rely on for drinking water and fishing. The authors point out that scientists still don't fully understand how much of these plastics end up in our food and water, or what health risks they might pose—meaning more research is urgently needed to answer these open questions. Since freshwater is a direct pathway for microplastics to enter our bodies, understanding this contamination matters for anyone drinking tap water or eating fish from affected areas.
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