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Environmental and health risks linked to microplastics and heavy metals in a proposed tropical Ramsar wetland ecosystem
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Scientists studying a protected wetland in Bangladesh found tiny plastic particles (microplastics) and toxic metals like lead, chromium, and nickel in the water, mud, and fish and shellfish that people eat from the area. If you regularly eat fish from this wetland, you could unknowingly swallow dozens of microplastic particles each week, though the researchers found that current metal exposure levels don't pose an immediate cancer or health risk—still, the findings signal a growing pollution problem worth watching, especially as it could worsen over time.
The coexistence of microplastics (MPs) and heavy metals (HMs) in freshwater wetlands poses significant ecological and health concerns. This is the first study to evaluate the ecotoxicology of MPs and HMs in water, sediment, and biota from Hakaluki Haor, Bangladesh, an Ecologically Critical Area (ECA). MPs were extracted from water, sediments, and tissues (muscle, gills, GIT) of organisms, and classified by size, colour, and shape under a microscope. FTIR analysis detected six polymer types: PA, PE, PET, PP, PS, and PVC, with PE the most common (37.09%). The highest MP levels were 113.33±8.82 items/L in water at site S8, 133.33±24.037 items/kg in sediment at site S5, G. giuris and L. marginalis amongst finfish and shellfish. ICP-MS analysis detected the presence of dominant HMs, including Pb, Cr, Ni, and Co, in water, dried sediment, and organisms sample. Ecotoxicological assessments revealed that most sites, except S6, exhibited HM contamination in the water, while the sediments indicated low to moderate risks, ranging from minor to severe. Quantitative estimates suggest that children might ingest 5–24 MPs particles weekly and adults 30–144 particles through consumption of contaminated fish; corresponding HM intakes range from 2.42×10 −5 to 2.55×10 −3 mg/kg for adults and 1.07×10 −4 to 1.13×10 −2 mg/kg for children. Carcinogenic and non-carcinogenic risks are within acceptable limits. Overall, this research provides a preliminary basis for understanding potential threats to both ecosystems and human health and highlights the urgent need for pollution control measures to mitigate risks and safeguard this ECA zone.
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Researchers examined seventeen freshwater fish species from Bangladesh and found microplastics in all of them — mostly tiny fibers under 1mm made of polyethylene — alongside concerning levels of heavy metals including chromium and lead. While microplastic-linked health risks were low to moderate, the heavy metal contamination posed elevated cancer risks for people who regularly eat these fish.
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