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Short-term toxicity to fish

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Justification for read across

No standard toxicity test data were found for unrefined / acid-treated oils. However, the potential effects of unrefined / acid treated oils can be predicted from aquatic toxicity data from studies of distillate aromatic extracts. This is valid for the following reasons: Unrefined /acid treated oils contain aromatic hydrocarbons, the quantities of which are substantially reduced through more severe refining steps. These aromatic compounds extracted from unrefined / acid treated oils are the primary constituents in distillate aromatic extracts, which are produced as by products in the refining of lubricant base oils. Therefore, aquatic toxicity data from studies of distillate aromatic extracts will provide a basis for a ‘worst case’ hazard assessment for the aromatic fraction contained in unrefined /acid treated oils.

This endpoint has been filled by read-across of measured data from another category. It is supported in a weight of evidence approach by a calculated value using composition information derived from two dimensional gas chromatography in conjunction with the PETROTOX model.

In a read-across key semi-static 96 -hour short-term Oncorhynchus mykiss toxicity test (OECD 203; KS=1), 10 fish/replicate were exposed to the Water Accommodated Fraction (WAF) of a heavy paraffinic distillate solvent extract (PSG 1860; CAS # 64742-04-7) at a nominal concentrations of 0 and 1,000 mg/L. The LL50 and the NOEL were > 1000 mg/L and ≥ 1,000 mg/L, respectively (BP Oil Europe, 1994).

Supporting data estimated from the PETROTOX computer model show no acute toxicity of unrefined / acid treated oil to freshwater fish at or below its maximum attainable water solubility (Redman et al. 2010b). These data support the applied read across.