Registration Dossier

Ecotoxicological information

Short-term toxicity to aquatic invertebrates

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

C14-20 Aliphatics (≤2% aromatic) are poorly soluble and made of constituents with various water solubility. As a consequence, the exposures were performed with Water Accommodated Fractions (WAFs). Therefore, the results are based on nominal loadings and the LC50 value given below is actually a LL50 (lethal loading) value. No LC50 could be derived from the acute toxicity studies.

The water accommodated fraction (WAF) of Hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, <2% aromatics did not produce a 50% effect (mortality) with Chaetogammarus marinus at a loading of 10,000 mg/L after a 96-hour exposure. Therefore, the 96-hour LL50is reported as >10,000 mg/L. There was no mortality at the 10,000 mg/L loading level after 96 hours. Therefore, the 96-hour NOELR for mortality is reported as 10,000 mg/L. There was also no mortality in the control.

The water accommodated fraction (WAF) of Hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, <2% aromatics did not produce a 50% effect (immobility) with Daphnia magna at a loading of 1000 mg/L after a 48-hour exposure. Therefore, the 48-hour LL50 is reported as >1000 mg/L. There was no mortality at the 1000 mg/L loading level after 48 hours. Therefore, the 48-hour LL0 for mortality is reported as 1000 mg/L. There was also no mortality in the control.

Many study reports that investigated the toxicity of the substance Hydrocarbons, C14-C18, n-alkanes, isoalkanes, cyclics, ≤2% aromatics on a marine copepod, Acartia tonsa exposed to water accommodated fractions (WAFs) are available. Several studies indicate very high values (up to 69155 mg in Altin, 1998b), In most of the studies the calculation of LL50 could not be achieved because of the low mortality levels obtained (Aunaas, 1996a and c; Larsen, 2006a, b, d and e; 2008a-c). When more than 5 values are available for LL50, the geometric mean of all the values is considered for LL50. However, in this particular case, as a great number of studies could not achieve the calculation of LL50, the geometric mean cannot be calculated, but 9 studies among 11 found that LL50 was greater than 3000 mg/L. Therefore, it is considered that LL50 is >3000 mg/L.

Key value for chemical safety assessment

Additional information