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Material-Dependent Toxic Mechanisms of Different Types of Particulate Emerging Contaminants Toward .
Summary
Scientists compared how three common types of tiny particle pollutants — plastic nanoparticles, silver nanoparticles, and titanium dioxide nanoparticles (found in sunscreen and other products) — harm algae, a key base of the aquatic food chain. They found each type of particle damages algae in a different way: plastic particles physically smother and interfere with cells, silver particles break down into toxic byproducts inside cells, and titanium dioxide causes lasting cell stress. This matters because it shows that simply testing for one type of damage (like cell stress) isn't enough to understand the real-world risks these increasingly common
Particulate emerging contaminants (PECs) pose increasing ecological risks due to their widespread occurrence and complex environmental behaviors, yet their heterogeneous toxic mechanisms remain poorly understood, especially under environmentally relevant conditions and concentration gradients. Here, was used as a model organism to systematically compare the effects of polystyrene nanoparticles (PSNPs), silver nanoparticles (AgNPs), and titanium dioxide nanoparticles (TiONPs) across environmentally relevant and elevated concentrations (100 μg/L and 10 mg/L). Distinct toxicity pathways were identified among PEC types. PSNPs primarily induced chronic interference via particle-cell interactions, heteroaggregation, sedimentation-driven shading, and extracellular polymeric substance (EPS) regulation, rather than ROS-dominated toxicity. In contrast, AgNPs exhibited transformation-driven toxicity, undergoing intracellular speciation into AgS, AgCl, and Ag, which triggered oxidative stress, membrane damage, and lipid peroxidation. TiONPs showed relatively high bioavailability and persistent oxidative stress effects. These results demonstrate that PEC toxicity evolves with particle type and concentration. Importantly, oxidative stress alone is insufficient to capture PEC ecotoxicity, which also involves the long-term impacts on algal behavior, sedimentation dynamics, and energy metabolism. This study provides mechanistic insights into PEC-induced algal toxicity and supports the source-oriented management of particulate pollutants in aquatic environments, particularly in hotspot scenarios such as wastewater discharge and sediment resuspension.