By: Mimi Martinez
Plastics have long been recognized for their chemical complexity, necessitating the incorporation of various additives to meet functional demands in everyday applications. However, the presence of chemicals such as phthalates and bisphenols in plastics has raised substantial concerns due to their adverse effects on both human health and the environment. This awareness, compounded by the global issue of plastic pollution, has spurred a concerted effort towards making plastics safer and more environmentally sustainable.
New data[i] has been compiled and released studying the vast array of chemicals present in plastics, paving the way for a safer future use of these ubiquitous materials. A comprehensive inventory encompassing 16,325 known plastic chemicals. The focus on each of these plastic chemicals centered around their properties, presence in plastic, and hazards. This focus has the potential to guide scientists and stakeholders in enhancing the safety and environmental sustainability of plastics.
The study reveals that a wide variety of chemical structures are used to fulfill a relatively limited range of functions in plastics, including 5,776 additives, 3,498 processing aids, 1,975 starting substances, and 1,788 non-intentionally added substances. Through a hazard-based evaluation, more than 4,200 chemicals are flagged as being of concern due to their persistence, bioaccumulation, mobility, or toxicity. Crucially, the study identifies major plastic types, such as polyethylene terephthalate (PET), polyvinyl chloride (PVC), and polyethylene (PE), as carriers of chemicals of concern. By grouping these chemicals according to their structural characteristics, researchers have pinpointed 15 high-priority groups requiring immediate attention for mitigation strategies. Over 40% of the chemicals in these groups have classified as hazardous.
Looking at the big picture, the key innovation of this work lies in a novel framework used to assess the hazards posed by these chemicals and categorize them based on structural similarities. This approach aims to overcome the limitations of conventional methods, ensuring timely identification and elimination of hazardous substances while preventing the substitution of one harmful chemical for another. This method could be used to help assess the lack of hazard data for over 10,000 plastic chemicals still requiring tests, which further underscore the gaps in current regulatory frameworks and industry transparency.
The implications of this research extend beyond mere inventory compilation. It provides a foundational baseline for future efforts aimed at enhancing the safety and sustainability of plastics. Three primary pathways are outlined to achieve these goals: removing known hazardous chemicals, disclosing the chemical composition of plastics, and simplifying their formulation.
