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Microplastics as a Trojan horse for trace metals
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Researchers demonstrated that microplastics can absorb toxic metals from surrounding water and release them in conditions mimicking the human gut, essentially acting as a "Trojan horse" that transports heavy metals like lead, arsenic, and chromium into the body alongside the plastic particles.
Due to an assumed lack of anionic binding sites (most plastics are non-polar), scientists long considered virgin particulate plastics inert towards metal ions. However, we proved significant metal sorption to microplastics at neutral pH and release in a solution mimicking gastrointestinal chemistry serving as a proof-of-principle for environmental and human bioavailability. Competitive ion-exchange incubation experiments comprised 55 metals and metalloids. Fast kinetics were observed with 45 %–75 % of As, Be, Bi, Cr, Fe, In, Pb, Th, Sn and the rare-earth element ions being sorbed after 1 h. The investigated metal and metalloid cations showed significant differences in the extent of sorption, based upon which a distinct categorization was possible. Microplastics are not only a potential danger for aquatic and human life, but - as demonstrated in this paper - also serve as a Trojan Horse for dissolved metal cations. The corresponding effects on aquatic and human health will gain higher importance in the near future due to the predicted increases of marine plastic litter and microplastic sorbents.
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Using a dynamic in vitro simulator of the human gastrointestinal tract, researchers showed that chromium and lead adsorbed to polyethylene and polypropylene microplastics are released and become bioaccessible in gut conditions, suggesting microplastics can act as vectors delivering heavy metals to human tissues.
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This review examines how microplastics act as 'Trojan horses' by carrying other environmental contaminants such as heavy metals, persistent organic pollutants, and pathogens into the intestinal system. Researchers analyzed the mechanisms by which microplastics adsorb and release these co-contaminants and how the combinations affect the gut barrier. The study highlights that the interactive toxicity of microplastics with other pollutants may be more harmful than either pollutant alone, particularly to intestinal health.
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This review examines the Trojan-horse effect in freshwater environments where microplastics adsorb and transport heavy metals, significantly increasing their potential ecological harm due to the large surface area and persistence of microplastic particles.
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This study examined how tiny microplastic particles travel through soil and groundwater while carrying lead, a toxic heavy metal. The researchers found a "Trojan horse" effect where microplastics transport lead to places it would not normally reach on its own. This is concerning because it means microplastics could spread heavy metal contamination further through drinking water sources.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.