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Environmental fate & pathways

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The ready biodegradability of 1,1-bis(tert-butylperoxy)cyclohexane was evaluated using a 28-day modified Sturm test according to EU method C.4 -C and OECD guideline no. 301 B. The biodegradation of 1,1-bis(tert-butylperoxy)cyclohexane totalled 5 % at the end of the test. Therefore, 1,1-bis(tert-butylperoxy)cyclohexane was non readily biodegradable in the 28-day modified Sturm test.

The performance of simulation tests for biodegradation in water and sediment is scientifically unjustified.

REACH Regulation (EC) No 1907/2006, Annex IX, Sect. 9.2.1.4, Col. 2, states as follows:

“9.2.1.4: The study need not to be conducted:

- if the substance is readily biodegradable, or

- if direct and indirect exposure of sediment is unlikely. ”

Direct and indirect exposure of the test item to water and sediment is highly unlikely. Due to the unstable nature of organic peroxides, it can be assumed that upon contact with water and organic matter, the test item undergoes rapid degradation resulting in the formation of respective alcohols and acids. Therefore simulation testing for biodegradation in water was considered not scientifically justified.

 

The performance of tests for biodegradation in soil is scientifically unjustified.

REACH Regulation (EC) No 1907/2006, Annex IX, Sect. 9.2.1.3, Col. 2, states as follows:

“9.2.1.3: The study need not to be conducted:

- if the substance is readily biodegradable, or

- if direct and indirect exposure of soil is unlikely. ”

Direct and indirect exposure of the test item to soil is highly unlikely. Due to the unstable nature of organic peroxides, it can be assumed that upon contact with soil and organic matter, the test item undergoes rapid degradation resulting in the formation of respective alcohols and acids. Therefore simulation testing for biodegradation in soil was considered not scientifically justified.