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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

From the read across with 1,3-bis[1-(tert-butylperoxy)-1-methylethyl]benzene: the substance is not considered as readily biodegradable. In the test conditions, no inhibitory effect on the micro-organisms of the inoculum was observed. 

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

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-bis[1-(tert-butylperoxy)-1-methylethyl]benzene.

The ready biodegradability of 1,3-bis[1-(tert-butylperoxy)-1-methylethyl]benzene was evaluated in a study performed in accordance with OECD testing guideline 301 D and GLP requirements. Due to structural analogy, read-across from supporting substance is considered as valid, thus, results given here may apply to [1,3(or 1,4)- Phenylenebis(1-methylethylidene)] bis[tert-butyl] peroxide.

1,3-bis[1-(tert-butylperoxy)-1-methylethyl]benzene is not biodegraded in the closed bottle test, and therefore should not be classified as readily biodegradable. This lack of biodegradation is not due to toxicity of the test compound because the endogenous respiration is not inhibited by 1,3-bis[1-(tert-butylperoxy)-1-methylethyl]benzene. Lack of biodegradation does not mean that 1,3-bis[1-(tert-butylperoxy)-1-methylethyl]benzene is recalcitrant in nature. The stringency of the test procedures could account for the recalcitrance of 1,3-bis[1-(tert-butylperoxy)-1-methylethyl]benzene in the closed bottle test.