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Influence of colourants on environmental degradation of plastic litter
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A three-year outdoor experiment found that plastic color significantly affects how fast plastics break down into microplastics, with red, blue, and green colored plastics degrading much faster than black, white, and silver ones. Black and white plastics were found to resist degradation for over 45 years, while certain colored pigments allow UV light to break down the plastic, accelerating the formation of harmful microplastics.
Plastic degradation and the resultant production of microplastics has an important effect on the environment and fauna across the world. This paper shows that the colourant incorporated into plastic formulations has a significant effect on the stability of plastics. A static experimental exposure of differently coloured polypropylene bottle tops from the same manufacturer to a moderate climate over 3 years showed that black, white and silver plastics were almost unaffected whereas the specific blue, green and especially red pigments used in this study were significantly degraded. The second part of the study collected littered HDPE plastic containers from a remote South African beach and analysed their condition as a function of the given manufacturing date stamp. Most items were black or white and samples up to 45 years old were found with relatively little environmental degradation other than mild abrasion. It appears that carbon and titanium dioxide colourants protect the HDPE polymer from photolytic degradation. While anthraquinone, phthalocyanine and diketopyrrolopyrrole pigments were found to enable UV light to degrade the polymer leading to brittle plastics, promoting the formation of microplastics, it is likely that other pigments that do not strongly absorb in the UV will result in similar degradation.
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Differential photoaging behaviors of different colored commercial polyethylene microplastics in water: The important role of color characteristics
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Researchers compared the photoaging behavior of transparent and five differently colored commercial polyethylene microplastics under UV exposure. They found that transparent microplastics degraded fastest, followed by yellow and red, while blue and green were most resistant, with the pattern correlating to color wavelength, lightness, and saturation characteristics. The findings demonstrate that color plays an important and previously overlooked role in determining how quickly microplastics break down in the environment.
Influence of microplastic colour on photodegradation of sorbed contaminants
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Researchers investigated how microplastic colour affects the photodegradation of sorbed contaminants, exposing anthracene-loaded polyethylene microplastics of four colours to UVA light and finding that unpigmented plastics degraded the contaminant fastest while white and blue pigmented plastics degraded it slowest, attributing differences to pigment light absorption profiles.
Color: An Important but Overlooked Factor for Plastic Photoaging and Microplastic Formation
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This viewpoint article argues that the color of plastic materials is an important but overlooked factor in how quickly plastics degrade and form microplastics through photoaging. The authors highlight that colored pigments and dyes can influence the rate of UV-driven plastic breakdown, which has implications for predicting microplastic formation in the environment.
Response of microplastic color to photoaging and its influence on the release characteristics of derived dissolved organic matters
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Researchers investigated how the color of microplastics affects their degradation under sunlight and the release of dissolved organic matter. The study found that red and yellow microplastics degraded faster due to stronger ultraviolet absorption, releasing more dissolved organic matter, and that long-term exposure to degradation byproducts from certain colored microplastics inhibited plant seed germination and antioxidant enzyme activity.
Critical Impact of Colored Pigments on the Long-Term Photoaging of Polyethylene Microplastics in Coastal Seawater Environments
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Researchers examined how colored pigments affect the long-term photoaging of polyethylene microplastics in coastal seawater under UV irradiation, finding that pigment type significantly alters the rate and character of surface degradation and associated contaminant release.
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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.