Intersecting circular economy and child health: A scoping review of legacy brominated flame retardants in plastic childcare products and toys.
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Polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecane (HBCDD) are persistent organic pollutants (POPs) banned under the Stockholm Convention due to their severe health effects, including endocrine disruption, neurodevelopmental problems, and cancer. Historically used in electrical and electronic equipment (EEE), vehicles, furniture, and building materials, these chemicals persist in recycled plastics and have been found in children's products. Our scoping review synthesized emerging literature to assess the extent of these chemicals in children's products. Of 799 initial results, 28 studies met our inclusion criteria after removing duplicates and excluding those that met exclusion criteria. The 28 studies revealed widespread presence of legacy PBDEs and HBCDD in plastic childcare products and toys, including toys embedded in chocolates, often at concentrations exceeding the Basel Convention's low POP content limits. This widespread contamination stems from weak regulation of recycling practices in the circular economy, the use of recycled and potentially contaminated virgin plastics, and the absence of specific standards for POP-BFRs content in recycled plastics and children's products. Children's unique vulnerabilities make this issue critical. Global actions are, therefore, needed to address this problem. The Basel Convention should adopt stricter POP content limits to prevent the recycling of plastics with high PBDEs and HBCDD levels. Both the Stockholm and Basel Conventions should establish safe limits for these chemicals in recycled plastics and ban contaminated recycled plastics in children's products to ensure a safer circular economy. Future research should apply a lifecycle approach to identify and mitigate all sources of legacy PBDEs and HBCDD in children's products.