Environmental contamination and risks of organic UV filters: Source, discharge, analytical methods and implications for ecological and human health

Organic Ultraviolet Filters (OUVFs), commonly used in sunscreens, cosmetics and industrial products to prevent ultraviolet radiation damage, are increasingly detected in the environment due to their widespread use and persistence. This has raised concerns over their toxicity and environmental impact, leading to the classification of OUVF 2-(2H-Benzotriazol-2-yl)-4,6-ditertpentylphenol (UV-328) as a persistent organic pollutant under the Stockholm Convention in 2023. In this review, current knowledge on the usage, discharge and environmental contamination of OUVFs is briefly discussed. The available analytical methodologies are also reviewed, especially for the extraction and detection of OUVFs in different matrix samples. Finally, the reported levels of OUVFs pollution in surface water, drinking water, aquatic organisms and human urine worldwide are discussed, along with their potential implications for ecological and human health. In general, typical OUVFs ethylhexyl methoxy cinnamate (EHMC) and Octocrylene (OC) have been shown to pose a significant potential risks in the surface waters of multiple countries such as Australia, China, Japan, the United States. Furthermore, while the OUVFs exposure concentrations in drinking water are generally low (below detection limit to 450 ng/L), prolonged exposure may still present potential health risks for humans.