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Sunlight mediated cadmium release from colored microplastics containing cadmium pigment in aqueous phase
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Scientists examined how sunlight irradiation causes cadmium to leach from colored microplastics containing cadmium-based pigments, finding that photo-dissolution drove cadmium release in aquatic conditions and that smaller particles and longer irradiation times increased release rates.
The plastics industry is the biggest consumer of cadmium pigments. Little is known about the leaching of hazardous Cd from colored microplastics containing cadmium pigment in aquatic systems. Here, we reported the release of Cd from different sized microplastics containing cadmium pigment in aqueous phase under simulated sunlight. The release of Cd was caused by the photo-dissolution of cadmium pigment. The release kinetics is highly size-dependent. It was relatively low for microplastics with size larger than 0.85 mm but increased significantly with decreasing size for microplastics smaller than 0.85 mm. The polymer matrix was oxidized during light exposure, leading to lower average molecular weight and the formation of oxygen-containing groups. Part of the polymer matrix was degraded into soluble organic carbon under simulated sunlight, resulting in continuous Cd release from the pigment particles embedded in the polymer. The polymer degradation rate is also highly size-dependent. The degradation of the polymer matrix and the release of Cd were intertwined. Cadmium leaching from microplastics from a commercial product containing cadmium pigment was confirmed in water under simulated sunlight. This work suggests that the photochemical processes of inorganic pigments will lead to the release of heavy metals from colored plastic debris.
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Promoted photodegradation of cadmium pigment-embedded microplastics: Role of reactive microenvironment
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Researchers studied how cadmium pigments embedded in microplastics influence their photodegradation behavior in polystyrene, polypropylene, and polyethylene. The study found that the reactive microenvironment generated by cadmium pigments significantly accelerated plastic degradation, particularly in polystyrene, and that this accelerated breakdown correlated with increased release of toxic cadmium ions into the surrounding water.
Promoted photodegradation of cadmium pigment-embedded microplastics: Role of reactive microenvironment
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Colorful plastics, like the polystyrene used in some food containers and packaging, may break down faster in sunlight when they contain cadmium-based pigments (a toxic heavy metal used to create certain colors), according to new research. As these plastics degrade, they release more cadmium into water, meaning brightly colored microplastics could pose a bigger contamination risk than previously thought. This suggests current safety guidelines for microplastics may need to account for pigments, not just the plastic itself.
Strong Photochemical Activity of Colored Microplastics Containing Cadmium Pigments: Mechanisms and Implications
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Researchers discovered that colored microplastics containing cadmium pigments are highly photochemically active, generating reactive oxygen species when exposed to sunlight. These reactive chemicals can damage DNA and harm living cells, and the effect was much stronger than in uncolored plastics. The study is significant because many consumer plastics are brightly colored, meaning the health and environmental risks of microplastics may be greater for colored plastic fragments than previously assumed.
Strong PhotochemicalActivity of Colored MicroplasticsContaining Cadmium Pigments: Mechanisms and Implications
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Researchers investigated the photochemical activity of microplastics colored with cadmium pigments, finding they generated reactive oxygen species including hydroxyl radicals and superoxide when exposed to simulated sunlight. These colored microplastics degraded over 91% of the endocrine disruptor 17β-estradiol within 23 hours, revealing an underappreciated environmental risk from pigmented plastics.
Polystyrene microplastics enhance oxidative dissolution but suppress the aquatic acute toxicity of a commercial cadmium yellow pigment under simulated irradiation
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Researchers studied how polystyrene microplastics affect the stability and toxicity of cadmium yellow pigment in water exposed to simulated sunlight. They found that the microplastics actually increased the dissolution of the pigment by generating reactive chemical species, but paradoxically reduced its acute toxicity to aquatic organisms. The study reveals that microplastics can alter the environmental behavior of co-existing pollutants in unexpected ways.
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