Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Before the current ECHA nomenclature rules became effective, we adopted the IUPAC name Hydrocarbons, C7-9, n-alkanes, isoalkanes, cyclics (EC number 920-750-0) as the identifier for the substance and this was the name that was used during the pre-registration phase of REACH. Also during this time, samples of the product were collected and the required physicochemical studies were conducted. The resulting robust studies summaries were entered into the IUCLID dossier using this name and EC number.

Between 2008 and 2009 ECHA issued a specific document about the nomenclature to be used under REACH, the so called REACH Implementation Project 3.10. The implications of this document to the appropriate nomenclature for the registered substance were only fully understood by us beginning in late 2009/early 2010.

As such, during the creation of the robust study summaries in IUCLID, the discrepancy with the substance naming was not noticed. As a result, it appears in IUCLID that the tested substance indicated is not the same as the registered one; however, if robust study summaries and/or associated study reports use the substance name “Hydrocarbons, C7-C9, n-alkanes, isoalkanes, cyclics,” they are actually referring to the registered substance “Hydrocarbons, C7-C8, n-alkanes” according to the revised REACH nomenclature rules.

A number of studies are available on the ecotoxicity of the substance hydrocarbons, C7-C9, n-alkanes, isoalkanes, cyclics to fish, Daphnia and algae. All studies were conducted using Water Accomodated Fractions (WAFs). Acute toxicity to fish ranged between LL50 values from 3 to 10 mg/L. EL50 values for Daphnia were found to range between 4.6 – 10 mg/L. Toxicity to algae measured as inhibition to growth rate (ELr50) and to biomass (ELb50) ranged from 10 – 30 mg/L each. A study on the chronic toxicity to Daphnia is available. The determination of the long-term toxicity, as measured by survival, sublethal effects, reproduction, and length of first generation adults resulted in a NOELR of 1 mg/L. The chronic aquatic toxicity to fish was estimated as it was done for other organisms using the Petrotox computer model (v. 3.04), which combines a partitioning model used to calculate the aqueous concentration of hydrocarbon components as a function of substance loading with the Target Lipid Model used to calculate acute and chronic toxicity of non-polar narcotic chemicals. The estimated freshwater fish 28-day NOELR value is 0.574 mg/L based on growth. The estimated EL50 value for the protozoan, Tetrahymena pyriformis, as a representative for microorganisms, is 11.14 mg/L based on growth inhibition.