Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Data on the acute aquatic toxicity of 2 members of this category (CAS Numbers: 68513-69-9; 68921-67-5) were obtained from proprietary sources (ExxonMobil 2003 and 2004). No data were identified in the published literature. The data from these streams have been read across to the other category members.

The studies were conducted to standard guidelines and according to GLP and so are considered fully reliable for use as key/supporting studies. Authors report the LC50 based on nominal loading rates (WAF) and mean measured concentrations. As the test substance is a hydrocarbon stream with various components reporting a measured concentration could be misleading as the measured concentration does not relate to a concentration of the raw stream. Instead we have used the results reported as WAF, which better represent the potential toxicity of the test substance. Similar sensitivity was found in all three trophic levels (fish 96 hr LL50 range 1.1 -5.6 mg/L; invertebrates 48hr EL50 1.2 -2.3 mg/L; algae 72 hr ErL50 range 2.2-2.3 mg/L).

WAF data can be used for comparison with the criteria for environmental classification under the CLP Regulation. However, its use must be considered carefully. Based on the available data (96 hr LL50 1.1 mg/L WAF) streams in this category should have the classification Chronic 2 under the CLP Regulation.

The measured partition coefficients of three streams in this category have log Kow ranges from 2.2 to >6.5. Therefore, the classifications cannot be removed.