Polybrominated diphenyl ethers in the environmental systems: a review

Area of Science:

• Environmental Science
• Toxicology
• Ecotoxicology

Background:

• Polybrominated diphenyl ethers (PBDEs) are widely used flame retardants with significant environmental persistence.
• These chemicals bioaccumulate in organisms and biomagnify through food webs, posing risks to both wildlife and human health.
• PBDEs can travel long distances via air and water, contaminating various environmental matrices and biota.

Purpose of the Study:

• To provide a comprehensive overview of PBDEs in environmental, human, and biota samples.
• To detail the physicochemical properties and environmental fate of PBDEs.
• To assess human exposure pathways and associated health effects of PBDEs.

Main Methods:

• Literature review of studies on PBDEs in environmental and biological samples.
• Analysis of PBDE congener distribution across different matrices (soil, sediment, human tissues, biota).
• Examination of PBDE physicochemical properties, transport, and transformation processes.

Main Results:

• PBDEs are persistent, bioaccumulative, and biomagnifying pollutants found globally.
• Sediments and soil are major reservoirs for PBDEs, with congeners like BDE 47, 99, 100, and 183 frequently detected.
• Human exposure occurs via inhalation, ingestion, and dermal contact, with PBDEs found in blood, breast milk, and tissues, linked to endocrine disruption and other health concerns.

Conclusions:

• PBDEs represent a significant environmental and human health concern due to their persistence and toxicity.
• Understanding PBDEs' fate, transport, and exposure routes is crucial for risk assessment and mitigation.
• Further research is needed to fully elucidate the long-term health impacts and develop effective strategies to reduce PBDE contamination.