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Optical characteristics and molecular transformation of polypropylene microplastic-derived dissolved organic matter driven by trichloroisocyanuric acid disinfectant
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Characteristics and Molecular Signatures of Microplastic-Derived Dissolved Organic Matter
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A synthesis of 51 studies found that smaller microplastics, higher temperatures, UV aging, and acidic conditions all increase the amount of dissolved organic matter that microplastics leach into water, with this leaching also acidifying aquatic environments. As microplastics accumulate and weather, the chemicals they release into water may pose additional risks beyond the particles themselves.
Insights into the inhibitory effects of trichloroisocyanuric acid disinfectant on the phototransformation of polypropylene microplastics
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This study investigated how trichloroisocyanuric acid, a disinfectant commonly used in aquaculture, mediates the phototransformation of microplastics in natural aquatic environments. Results showed that artificially introduced chemicals can alter the rate and products of microplastic degradation under sunlight exposure.
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Researchers studied how UV light and common water disinfection chemicals break down microplastics in water and found that different treatment methods produce different types of dissolved organic matter from the plastic. Some treatment combinations, particularly UV with chlorine, created byproducts that could form harmful disinfection byproducts when water is later chlorinated. This is important because it means water treatment processes might unintentionally create new toxic compounds from the microplastics already present in water.
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This review examines microplastic-derived dissolved organic matter (MPs-DOM), which plastic debris releases at an estimated 23,600 tons annually into surface waters, covering its chemical properties, release patterns, and interactions with metals, microorganisms, and the carbon cycle. MPs-DOM represents a largely overlooked secondary pollution pathway through which microplastics extend their environmental impact well beyond the particles themselves.
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