Di-tert-butyl α,α,α',α'-tetramethyl-(p-phenylenedimethylene) diperoxide

Short-term toxicity to aquatic invertebrates

Description of key information

From the read across with 1,3 (or 1,4)-bis[1-(tert-butylperoxy)-1-methylethyl]benzene: the substance 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 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).

Additional information

There is no data on 1,4-bis[1-(tert-butylperoxy)-1-methylethyl]benzene. A read across approach is proposed with 1,3 (or 1,4)-bis[1-(tert-butylperoxy)-1-methylethyl]benzene.

The acute toxicity of [1,3(or 1,4)-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide was evaluated with Daphnia magnain 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.