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The polymers and their additives in particulate plastics: What makes them hazardous to the fauna?
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This review argues that microplastics should not be treated as a single category because different plastic types have very different chemical properties and health risks. Each polymer carries its own set of chemical additives like flame retardants, plasticizers, and stabilizers, which can leach out and cause additional harm to organisms. Understanding the specific dangers of each plastic type and its additives is essential for accurately assessing the true health risks of microplastic exposure.
Due to the increasing concerns on global ecosystems and human health, the environmental risks posed by microplastics (MPs) and nanoplastics (NPs) have become an important topic of research. Their ecological impacts on various faunal species have been extensively researched and reviewed. However, the majority of those studies perceive these micro(nano)-plastics (MNPs) as a single entity rather than a collective term for a group of chemically distinct polymeric particulates. Each of the plastic polymers can possess unique physical and chemical behavior, which, in turn, can determine the possible environmental impacts. Furthermore, many studies explore the adsorption, absorption, and release of other environmental pollutants by MNPs. But only a handful of them explore the leaching of additives possessed by these polymers. Data on the environmental behavior and toxicity of individual additives associated with different polymer particulates are scarce. Knowledge about the leachability and ecotoxicity of the additives associated with environmental MNPs (unlike large plastic particles) remains limited. The ecological impacts of different MNPs together with their additives and the basis of their toxicity have not been explored yet. The present review systematically explores the potential implications of environmentally predominant polymers and their associated additives and discusses their physicochemical characteristics. The review ultimately aims to provide novel insights on what components precisely make MNPs hazardous to the fauna. The paper also discusses the major challenges proposed in the available literature along with recommendations for future research to throw light on possible solutions to overcome the hazards of MNPs.
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Aquatic toxicity of chemically defined microplastics can be explained by functional additives
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Researchers manufactured microplastics from four polymer types with precisely defined chemical compositions, including different additive formulations, and tested their toxicity to aquatic organisms. They found that the toxic effects of microplastics could largely be explained by the functional additives they contained rather than the base polymer itself. The study suggests that the chemical additives in plastics, not just the plastic material, are a primary driver of microplastic toxicity in aquatic environments.
Understanding and Mitigating the Toxic Impacts of Microplastic Pollution on Environmental Health
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This review covers the sources, types, and ecological impacts of microplastics as environmental contaminants, examining how polymer-specific properties such as chemical additives affect toxicity across ecosystems and discussing mitigation approaches including physical and chemical remediation.
Plastic additives and microplastics as emerging contaminants: Mechanisms and analytical assessment
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Researchers reviewed how chemical additives mixed into plastics during manufacturing — including stabilizers, flame retardants, and plasticizers — can leach out throughout a plastic's lifecycle and pose risks to ecosystems and human health, with microplastics acting as carriers that concentrate and transport these hazardous chemicals.
Contribution of chemical toxicity to the overall toxicity of microplastic particles: A review
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This review examines how the chemical toxicity of microplastics, from leached additives and absorbed pollutants, contributes to their overall harmful effects beyond just physical damage. Over 16,000 chemicals are used in plastic manufacturing, many of which can leach out and cause harm to living organisms at environmentally realistic concentrations. The findings suggest that the chemical cocktail carried by microplastics may be just as important as their physical presence when assessing health risks.
A Detailed Review Study on Potential Effects of Microplastics and Additives of Concern on Human Health
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This detailed review examines the potential health effects of microplastics and the chemical additives they contain, which can include plasticizers, flame retardants, and stabilizers. Researchers describe how humans are exposed to these hazardous chemicals through ingestion, inhalation, and skin contact as microplastics break down in the environment. The study emphasizes that the combination of physical particle effects and chemical toxicity makes microplastics a uniquely complex health concern.
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