Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The test item was biodegradable 26 % at day 28 in the closed bottle test according to OECD guideline 301. In the prolonged closed bottle test this compound was biodegraded 53 % at day 140. Therefore it can be concluded that the test item is not ready biodegradable, but inherently biodegradable.

Additional information

The ready biodegradability of the test item was assessed according to OECD guideline 301 and EU-method C.6. The test item was biodegraded 26 % at day 28 in the Closed Bottle test. In the prolonged Closed Bottle test this compound was biodegraded 53 % at day 140. Therefore it can be concluded that the test item is not ready biodegradable, but inherently biodegradable.

 

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

REACH Regulation No. 1907/2006, Annex IX, Sect. 9.2.1.2, Col. 2, states as follows:

“9.2.1.2: 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. Furthermore,TBPNDwas considered to be inherently biodegradable, 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 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. Furthermore, TBPND was considered to be inherently biodegradable, therefore simulation testing for biodegradation in sediment was considered not scientifically justified.