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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

72 hours of exposure to polysulfides, di-tert-dodecyl at its saturation concentration was found not to inhibit the growth of Pseudokirchnerilla subcapita, giving a NOEC of <0.08 mg/L (no LOEC observed). The 72hr NOELR was determined to be at least the limit of solubility of the nominal 100 mg/L concentration solution, though may lie above this value.

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Additional information

Thiebaud (2000) is a GLP-compliant guideline study showing the growth inhibition effect of polysulfides, di-tert-dodecyl on Pseudokirchnerilla subcapita over 72 hours. The maximum level of exposure, the saturation concentration (0.080 mg/L), resulted in no inhibition of the growth of Pseudokirchnerilla subcapita. The study is considered reliable and suitable for use for this endpoint.

This is supported by Hoffmann (2010), a GLP compliant, algae toxicity study following OECD guideline 201 and OECD guideline 23 on the testing of difficult substances. Due to the low water solubility of the substance, the test solutions use Water Accommodated Fractions, with no analytical monitoring, therefore only nominal concentrations are used. The only deviations to the study plan are the range in temperatures of the storage of the substance and this is not expected to affect the outcome of the experiment.