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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Key value for chemical safety assessment

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Read across justification

Several criteria justify the use of the read across approach to fill data gaps for paraffin and hydrocarbon waxes using other lubricant base oil analogs. Primarily the basis for the read-across is the similar physical chemical properties shared by the paraffin and hydrocarbon waxes and other lubricant base oils.

In a read-across key static 72-hour algal (Pseudokirchneriella subcapitata) limit test (OECD 201; KS = 2), the freshwater alga was exposed to the Water Accommodated Fraction (WAF) of an other lubricant base oil (N100DW), at a nominal concentration of 100 mg/L.  The NOEL was ≥ 100 mg/L based upon average specific growth rate and cell yield (Petro-Canada, 2008).  

This study is scientifically sound and satisfies the guideline requirements for toxicity to aquatic algae.  

Supporting data estimated from the PETROTOX computer model show no acute toxicity of paraffin and hydrocarbon wax to algae at or below its maximum attainable water solubility (Redman et al. 2010b). These data support the applied read across.