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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Endpoint:
biodegradation in water: simulation testing on ultimate degradation in surface water
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the substance is highly insoluble in water
Endpoint:
biodegradation in water: sediment simulation testing
Data waiving:
exposure considerations
Justification for data waiving:
the study does not need to be conducted because direct and indirect exposure of sediment is unlikely

Description of key information

Direct and indirect exposure of the test item 1,1’-(1,1,2,2-tetramethylethylene)dibenzene to water and sediment is highly unlikely. The test substance is practically insoluble in water. In addition, low exposure is guaranteed, as no sludge application from STP on soil will be done and aerial deposition is negligible. Thus, simulation testing for biodegradation in water and sediment was considered not scientifically justified.

Key value for chemical safety assessment

Additional information

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

REACH Regulation (EC) No 1907/2006, Annex IX, Sect. 9.2.1.2, 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 1,1’-(1,1,2,2-tetramethylethylene)dibenzene to water and sediment is highly unlikely. The test substance is practically insoluble in water. In addition, low exposure is guaranteed, as no sludge application from STP on soil will be done and aerial deposition is negligible. Thus, simulation testing for biodegradation in water and sediment was considered scientifically not justified.