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Impact of Microplastics on the Fate and Behaviour of Arsenic in the Environment and Their Significance for Drinking Water Supply
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This review highlights a largely overlooked problem: microplastics in the environment can adsorb arsenic — one of the world's most dangerous water contaminants — onto their surfaces and potentially transport it to new locations or make it harder to remove during drinking water treatment. The authors call for urgent research into how the presence of microplastics affects the performance of arsenic removal technologies, since both pollutants now co-occur in water sources globally.
The ubiquitous presence of microplastics (MPs) is a topic of great concern. Not only do MPs themselves represent potential toxicants for human health, they are never found alone in the environment and interact with and adsorb a variety of toxicologically significant pollutants. This review summarises recent work on interactions between MPs and heavy metals in the environment, with a special focus on arsenic, one of the most widespread and problematic water contaminants. Evidence for the adsorption of arsenic onto MP surfaces is given and the recent research into the consequences of this phenomenon for freshwater, marine, and soil environments presented. Finally, the lack of research into the significance of interactions between arsenic and MPs during drinking water treatment is highlighted. The performance of arsenic removal technologies is governed by a multitude of different factors, and with MPs detected in water sources all over the world, data on how these MPs impact the removal of arsenic and, indeed, other major water contaminants are urgently needed.
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This study developed new coagulant chemicals for removing arsenic from drinking water and tested how the presence of microplastics affects the treatment process. Microplastics in the water interfered with arsenic removal by competing for the coagulant chemicals, reducing treatment effectiveness. The findings highlight a practical concern: as microplastic contamination in water sources increases, it may make it harder to remove other dangerous pollutants from drinking water.
[Adsorption Characteristics of Arsenic on UV-aged Polypropylene Microplastics in Aqueous Solution].
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This study examined how UV weathering (aging) changes the ability of polypropylene microplastics to adsorb arsenic from water, finding that aged plastic had rougher surfaces and more oxygen-containing groups, which enhanced arsenic adsorption. Environmental factors like pH and dissolved organic matter also influenced how much arsenic stuck to the plastic. Because aged microplastics bind more arsenic, they could carry this toxic heavy metal into aquatic food webs more effectively than pristine plastic particles.
Adsorption of As(III) by microplastics coexisting with antibiotics
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This study examined how microplastics absorb arsenic, a toxic metal, from water, especially when antibiotics are also present. Smaller and more aged microplastic particles absorbed more arsenic, and environmental factors like pH and dissolved organic matter significantly changed absorption rates. This is relevant to human health because microplastics in contaminated water can concentrate toxic metals like arsenic on their surface and potentially carry them into drinking water or the food chain.
Interface adsorption characteristics of microplastics on multiple morphological arsenic compounds
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Researchers studied how polystyrene and PET microplastics adsorb different forms of arsenic, a toxic element commonly found in contaminated water. They found that polystyrene had a much higher capacity to bind arsenic compounds than PET, and that the arsenic-loaded microplastics were more toxic to organisms than either pollutant alone. The study highlights that microplastics can act as carriers for toxic heavy metals, amplifying their environmental harm.
Effect of microplastics on arsenic transport in shallow groundwater of coastal transition zones
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Scientists found that tiny plastic particles (microplastics) in coastal groundwater can actually help arsenic—a toxic contaminant—travel farther through the water, with plastic from water bottles and packaging (polystyrene and polyethylene) being the worst offenders. This matters because millions of people near coastlines rely on groundwater for drinking, and this research suggests microplastic pollution could make arsenic contamination spread more easily, potentially increasing exposure risks even in areas previously thought safer due to natural filtering.
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