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EC number: 232-455-8
CAS number: 8042-47-5
A highly refined petroleum mineral oil consisting of a complex combination of hydrocarbons obtained from the intensive treatment of a petroleum fraction with sulfuric acid and oleum, or by hydrogenation, or by a combination of hydrogenation and acid treatment. Additional washing and treating steps may be included in the processing operation. It consists of saturated hydrocarbons having carbon numbers predominantly in the range of C15 through C50.
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.
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