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Ecotoxicological information

Sediment toxicity

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Description of key information

The NOEC 28 days from OECD 218 test was calculated to be > 891.81 mg/kg dw as no significant effect on the emergence of chironomids was observed at the tested concentration compared to the controls.

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater sediment:
891.81 mg/kg sediment dw

Additional information

The effects of prolonged exposure to [1,3(or 1,4)-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide was evaluated on the sediment-dwelling larvae of the fresh water dipteran Chironomus riparius Meigen (Diptera: Chironomidae) in a limit test performed in accordance with OECD testing guideline 218 and GLP requirements (Hugill, 2015).

The artificial sediment was fortified with [1,3(or 1,4)-phenylenebis(1-methylethylidene)] bis[tertbutyl] peroxide, at a nominal concentration of 1000 mg/kg dry weight basis (corresponding to 891.81 mg/kg dw expressed as initial measured concentration in sediment). A control and a a solvent control were also included to the test. The sediment was transferred to test vessels and covered with reconstituted water. First instar larvae were introduced into the sediment water system. The larvae were fed daily throughout the test. Exposure continued for 28 days, during which period the time, numbers and sex of emerging adults were recorded. The overlying water was gently aerated, but was not be renewed during the test (i.e.a static system).

During the test, the distribution data showed that the majority of the test item remained within the sediment. The mean measured concentrations at Day 0 and 28 showed that 89.2-95.6% of the test item was recovered from the sediment, <0.1% was found in the interstitial water and <0.01% was found in the overlying water. The mean measured concentrations for Day 0 and 28 were within 20% of the nominal test item concentration. Therefore the results of this test will be reported on the Day 0 mean measured sediment concentrations.

All the validity criteria were fulfilled. The NOEC 28 days was calculated to be > 891.81 mg/kg dw (Day 0 measured sediment concentration) as no significant effect on the emergence of chironomids was observed at the tested concentration compared to the controls.