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Toxicity to aquatic algae and cyanobacteria

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Algal toxicity was examined using a weight of evidence approach.  In six static 72-hour algal (Pseudokirchneriella subcapitata) limit tests (OECD 201; KS = 2), the freshwater aquatic alga was exposed to the WAFs of highly refined base oils (HT70, HT200, HT350, N60LHT; N650HT; and HT100) at nominal concentrations of 100 mg/L. The NOEL was ≥ 100 mg/L for HT70, HT200, HT350, N60LHT; N650HT based upon average specific growth rate and cell yield (Petro-Canada, 2008l, m, n, o, p). TheLOEL for HT100 was ≤ 100 mg/L based upon average specific growth rate and cell yield. Further testing across a wider range of nominal concentrations would be needed to determine a specific LOEL or NOEL value for this substance (Petro-Canada, 2008k).

Based on five studies resulting in no effects and one study resulting in a LOEL ≤ 100 mg/L, highly refined base oils are not toxic to aquatic algae.