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The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Administrative data

Link to relevant study record(s)

Description of key information

[1,3(or 1,4)-Phenylenebis(1-methylethylidene)]bis[tert-butyl]peroxide was not found to be acutely toxic to Daphnia magna when dispersed in water at a nominal loading rate of 1.0 mg/L equivalent to an initial mean measured concentration of 0.0219 mg/L.
Consequently, the 48-hour EC50 value for [1,3(or 1,4)-Phenylenebis(1-methylethylidene)]bis[tert-butyl]peroxide could not be calculated but must be >1.0 mg/L (>0.0219 mg/L). The “no observed effect loading rate” was 1.0 mg/L (0.0219 mg/L as initial mean measured concentration).

Key value for chemical safety assessment

Additional information

The acute toxicity of [1,3(or 1,4)-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide was evaluated with Daphnia magna in a study performed in accordance with OECD testing guideline 202 and GLP requirements.

The young daphnids were exposed to nominal test concentrations of 1 mg/L under static conditions during 48 hours. The mean measured concentrations were not maintained between 80 and 120 % of nominal.

Mortality in control, temperatures, pH range and dissolved oxygen concentration were reported and in agreement with the guideline requirements.

The test substance was not found to be acutely toxic to Daphnia magna at a nominal loading rate of 1.0 mg/L, equivalent to an initial mean measured concentration of 0.0219 mg/L.