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EC number: 265-058-3
CAS number: 64741-57-7
A complex combination of hydrocarbons produced by the vacuum distillation of the residuum from atmospheric distillation of crude oil. It consists of hydrocarbons having carbon numbers predominantly in the range of C20 through C50 and boiling in the range of approximately 350°C to 600°C (662°F to 1112°F). This stream is likely to contain 5 wt. % or more of 4- to 6-membered condensed ring aromatic hydrocarbons.
In a key semi-static 96-hour acute rainbow trout (Oncorhynchus mykiss) test (OECD 203; KS=1),10 animals/dose were exposed to water accommodated fractions (WAFs) of Intermediate fuel oils 30-380 (CAS # 68476-33-5) at loading rates of 0, 2.0, 5.1, 13, 32, and 79 mg/L. The LL50 was 79 mg/L (EMBSI, 2008a).
In six reliable supporting semi-static 96-hour acute rainbow trout (Oncorhynchus mykiss) studies using WAF methodology, the LL50 values of other heavy fuel oil samples ranged from >94 to >1000 mg/L (EMBSI, 2008b,c,d; Shell, 1997a,b).
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