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Polymer-specific hazard mapping of microplastics across Bangladeshi aquatic systems: a harmonised synthesis integrating the Polymer Hazard Index and uncertainty analysis
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Scientists took a fresh look at microplastic pollution in Bangladesh's rivers and coastal waters, but instead of just counting plastic particles like most studies do, they ranked the different plastic types by how toxic they actually are. This matters because not all plastics are equally harmful—some, like polyamide (used in things like textiles and fishing nets), are far more dangerous than others, meaning water samples with fewer plastic particles could still pose greater health risks depending on which types of plastic are present. This more precise approach could help identify the real pollution hotspots that deserve the most attention for protecting drinking water and food safety.
Microplastic (MP) pollution is pervasive across Bangladeshi rivers and coastal waters, yet most published assessments report only total particle counts, which are insensitive to polymer-specific toxicity. The Polymer Hazard Index (PHI; Lithner et al., 2011) assigns toxicity scores to individual polymer types on the basis of the hazard classification of their constituent monomers (e.g., polyamide PA = 1,000; polypropylene PP = 1), enabling ecologically meaningful risk comparisons across sites and matrices.
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