Benzene, mono-C10-13-alkyl derivs., fractionation bottoms, heavy ends, sulfonated

Endpoint summary

Description of key information

No studies were available on the aquatic toxicity of the test substance. Therefore, read across is performed using studies from the related substance benzenesulfonic acid sodium salt (LABS Na).

Short-term aquatic toxicity

Aquatic invertebrates

Five studies characterize the potential for short-term toxicity to aquatic invertebrates using LABS Na. In the key study used for chemical safety assessment (Hooftman and van Drongelen-Sevenhuijsen 1990),Daphnia magnawere exposed for 48 hours to LABS Na at nominal concentrations of 0 (Control), 3.2, 5.6, 10, 18, 32, 56 and 100 mg/L under static conditions. The sample was 12.1% active ingredient, and results were adjusted to the active ingredient basis. The resultant 48-h EC₅₀value based on mobility was 2.9 mg a.i./L. Three additional aquatic invertebrate studies are available, all with EC50 values greater than 2.9 mg/L. In the fifth study (Kimerle and Swisher 1977), the toxicity of high molecular weight LABS Na, individual LABS Na homologues, and nonlinear LABS Na components (DTIS) was measured in a series of aquatic toxicity tests withDaphnia magna. Results show that biodegradation of LABS Na influences the toxicity, with the remaining LABS Na becoming less toxic, confirming the results of the study (above) with fathead minnows.

Aquatic algae and cyanobacteria

Four studies characterize the potential for short-term toxicity to aquatic algae using LABS Na. The study of Muehlberg et al. (1984) obtained a 15 day LOEC of 10 mg/L for the algae Chlorella kessleri. Ward et al. (1982) obtained a 96 hour EC50 of 0.91 mg/L for the cyanobacterium Microcystis aeruginosa. Lewis al. (1986) obtained a 96 hour EC50 of 29 mg/L for the algae Pseudokirchneriella subcapitata. Scholz al. (1992) obtained a 72 hour ErC50 of 127.9 mg/L for the algae Desmodesmus subspicatus.