John Wiley & Sons, Ltd.

Semipolar polycyclic aromatic compounds: Identification of 15 priority substances and the need of regulatory steps under reach regulation

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Semipolar polycyclic aromatic compounds (sPAC) are frequently found in association with homocyclic polycyclic aromatic hydrocarbons (PAH) in UVCBs (substances of unknown or variable composition, complex reaction products or biological materials) from coal or crude oil and products derived thereof. However, there are major information deficiencies with regard to their prevalence, their toxicological and ecotoxicological potential, persistency and bioaccumulation characteristics. Therefore in this work the environmental concern and relevance of sPAC is addressed in a general, stepwise approach. First a large list of sPAC is collected and subsequently refined by assessing their PBT‐properties by QSAR‐methods and their relevance by determining their respective frequency of occurrence. In this way 15 priority sPAC are identified. These 15 priority sPAC are further characterized in detail with respect to their ecotoxicological properties, environmental behavior, carcinogenicity and genotoxicity attributes. All of these 15 substances were quantified in distillate or product samples. In the next step some principles for nomination of indicator substances, indicative for the overall content of sPAC, are derived. Data gaps on ecotoxicological endpoints preclude final conclusions, but the respective necessary supplemental tests were identified. Five of the 15 sPAC are tentatively characterized as potential substances of very high concern (SVHC) for the environment. The overall results of this study also clearly show that regulatory risk management of homocyclic PAH within European REACH regulation does not address the environmental concern created by sPAC within UVCB from coal or crude oil. The study proves the need for additional regulatory steps under REACH and suggests indicator substances for their enforcement. Integr Environ Assess Manag © 2014 SETAC

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