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EC number: 272-716-3 | CAS number: 68909-83-1
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
The toxicity to microorganisms by Naphthalenesulfonic acid, methyl, butyl, sodium salt is read across from the structural analogue Aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts (CAS no 1258274 -08 -6). For algae and daphnia it has been shown that, similar to most other chemicals, longer alkyl chain naphthalene sulphonates are more ecotoxic than shorter alkyl chain naphthalene sulphonates. Read across from the source chemical, Aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts (CAS no 1258274 -08 -6) to the structural analogue (target chemical) Naphthalenesulfonic acid, methyl, butyl, sodium salt is therefore considered justified.
The toxicity of Aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts (CAS no 1258274 -08 -6) to microorganisms was evaluated in the respiration inhibition test according to an OECD 209 test under GLP conditions. The observed effects were 3h-EC10 for this substance for activated sludge was 222 mg/L and the 3h-EC50 was 345 mg/L (concentration based on active ingredient).
Key value for chemical safety assessment
- EC10 or NOEC for microorganisms:
- 222 mg/L
Additional information
The toxicity to microorganisms by Naphthalenesulfonic acid, methyl, butyl, sodium salt is read across from the structural analogue Aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts (CAS no 1258274 -08 -6).
The toxicity of Aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts (CAS no 1258274 -08 -6) to activated sludge was determined in a respiration inhibition test in accordance with OECD Test Guideline 209, and in compliance with GLP. The toxicity of Aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts to activated sludge was determined at a contact time of 3 hours, using various concentrations of the test substance. The EC50 was reported as 651 mg/L with 95% confidence limits of 439 and 1221 mg/L based on testmaterial. The EC10 was 420 mg/L based on test material. The EC50 is 345 mg/L and EC10 is 222 mg/L based on active ingredient concentration. The substance is therefore considered not harmful to activated sludge (Reliability 1).
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