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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

The toxicity of polysulfide di-tert-nonyl to zebrafish (Danio rerio) was read across from polysulfide di-tert-dodecyl. Based on the loading rate, the results give a 96-hour LL50 of >100 mg/L. However, serious methodological deficiencies were found and the study is considered unreliable. A second study conducted with polysulfide di-tert-nonyl, showed the substance was not toxic at the limit of solubility, but concentrations in solution could not be determined as the limit of detection was above the water solubility limit. Chronic testing has been conducted with fish and is considered more appropriate for assessing this endpoint.

Key value for chemical safety assessment

LC50 for freshwater fish:
100 mg/L

Additional information

The toxicity of polysulfide di-tert-nonyl has been read across from polysulfide di-tert-dodecyl. Hoffmann (2010) is a GLP-compliant, static closed vessel limit test following OECD guideline 203. No further dose-response test was performed despite the limit test showing toxic effects, as the concentration tested was the threshold concentration and the highest concentration at which substances need to be tested.

There are considered to be significant methodological deficiencies with the study. Based on recent water solubility testing that has been conducted, the test item has a solubility of 0.26 µg/L. The method used for preparing the test solutions means that droplets may be present in the water column, and as no analytical monitoring was conducted the concentrations cannot be verified. The study is therefore considered to be unreliable, and chronic test results are used to assess toxicity to fish instead.

A second study is available, conducted with polysulfides, di-tert-nonyl. Thiebaud (2000) is a GLP-compliant study following OECD 203 guidelines. The concentration of the substance in the solutions could not be determined as the water solubility limit was below the limit of analytical detection. However, the substance was found not to be toxic at the limit of solubility.