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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The test substance is poorly soluble and made of constituents with various water solubility. As a consequence, the exposures were performed with Water Accomodated 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 48h-LL50 is > 3000 mg/l.

Key value for chemical safety assessment

Additional information

Eleven study reports were available and input as endpoint summary records. All the studies investigate 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). Several studies indicate very high values (up to 69 155 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.