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Short-term toxicity to aquatic invertebrates

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Description of key information

All data for short-term toxicity to invertebrates come from two study reports conducted using structurally similar analog chemicals according to OECD TG 202 or EPA OTS 797.1300. In each of these studies, the 48 hour Effective Loading Rate was equivalent to the highest concentrations tested. 

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
100 mg/L

Additional information

All data for short-term toxicity to invertebrates come from two study reports conducted using structurally similar analog chemicals according to OECD TG 202 or EPA OTS 797.1300. In each of these studies, the 48 hour Effective Loading Rate was equivalent to the highest concentrations tested. In short-term studies performed according to EPA OTS 797.1300 (Daphnid Acute Toxicity Test), water fleas (Daphnia magna) were exposed to four concentrations (0,100, 300, and 1000 mg/L) of test substance under a static conditions (Ward, 1993). Test substances were tested independently and include benzenesulphonic acid, C14-24 branched/ linear alkyl derivative, calcium salt (CASN 115733-09-0), benzenesulfonic acid, mono C15-30 branched alkyl and di C11-13 branched and linear alkyl derivatives, calcium salts, overbased (CASN 71486-79-8) or benzenesulfonic acid mono and dialkyl derivatives, magnesium salts (CASN 71786-47-5). Mortality/immobilization were observed daily. The 48-hour No Observed Effect Loading Rate (NOELR) was 1000 mg/L when 24 hour old daphnids were exposed in each of the studies. The 48 hour Effective Loading Rate (EL50) is >1000 mg/L based on nominal concentrations.

In another study performed according to OECD TG 202 (Daphnia sp. Acute Immobilisation Test), water fleas (Daphnia magna) were exposed to 0 and 100 mg/L of either sulfonic acids, petroleum, calcium salts (CASN 61789-86-4) or sulfonic acids, petroleum, sodium salts (CASN 68608-26-4) for a period of 48 hours under static conditions (Goodband, 2005). In each of the studies the 48 hour No Observed Effective Loading Rate (NOELR) was 100 mg/L and the 48 hour Effective Loading Rate (EL50) was >100 mg/L.