Registration Dossier
Registration Dossier
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EC number: 270-736-7 | CAS number: 68477-53-2 A complex combination of organic compounds obtained by the distillation of products from a steam cracking process. It consists of unsaturated hydrocarbons having carbon numbers predominantly in the range of C5 through C12.
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Short term toxicity to algae was available for 2 streams within this Category. 72hr ErL50 growth rate range was 2.2 - 2.3mg/l, ErC50 growth rate range was 1.6 - 2.0mg/l. 96h ErL50 growth rate range was 2.1 - 2.2mg/l, ErC50 growth rate range was 1.6-1.8mg/l, A 96 hr NOEC of 0.12mg/l was cited.
Key value for chemical safety assessment
Additional information
CAS No 68513 -69 -9 The reported 96hr ErC50, based on measured concentrations, was 1.8mg/l. This study is GLP compliant and follows a standard guideline. It is considered reliable and acceptable for use as a key study.
CAS No 68513 -69 -9 and 68921-67-5 This is a GLP compliant, guideline study considered adequate for assessment. After 72 and 96 hrs of exposure to Pyrolysis C10+ Fuel Oil (from Pyrolysis Gasoline Distillation) the following conclusiosn were made: Effects on growth rate (r) based on actual loading rates: 72hr ErL50 = 2.3 mg/l; 96 hr ErL50 = 2.2 mg/l; Effects on biomass (b) based on actual loading rates: 72 hr EbL50 = 1.3 mg/l, 96hr EbL50 = 1.2 mg/l; effects on growth rate (r) based on measured concentrations: 72 hr ErC50 = 1.7 mg/l, 96 hr ErC50 = 1.6 mg/l; Effects on biomass (b) based on measured concentrations 72 hr EbC50 = 0.95 mg/l, 96 hr EbC50 = 0.91 mg/l; 72 and 96 hr NOELR = 0.18 mg/l NOEC 0.12 mg/l (average specific growth rate); 72 and 96 hr NOELR 0.18 mg/L NOEC 0.12 mg/l (area under the growth curves)
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