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Environmental fate & pathways

Biodegradation in soil

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Reference
Endpoint:
biodegradation in soil: simulation testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Justification for type of information:
According to Annex IX & X, Column 2 of Regulation (EC) 1907/2006, Section 9.2 " Further biotic degradation testing shall be proposed by the registrant if the chemical safety assessment according to Annex I indicates the need to investigate further the degradation of the substance and its degradation products. The choice of the appropriate test(s) depends on the results of the chemical safety assessment and may include simulation testing in appropriate media (e.g. water, sediment or soil)." Degradation/biodegradation testing is not relevant for inorganic substances that are not (bio)degradable, including carbon black non nanoforms. Thus, in accordance with Column 2 of Regulation (EC) 1907/2006, Section 9.2, testing of carbon black does not appear to be scientifically necessary because the substance is inorganic. As an inorganic substance with the chemical structure "C", bulk of carbon black which essentially are carbon in its elemental state, cannot be used as a carbon source and will not be biodegraded by microorganisms. The generally accepted guidelines for the examination of  the biodegradability of substances (i.e., OECD- and EU-guidelines) can be used only for organic substances. (Bio)degradation testing has no meaning for inorganic substances, including inorganic materials. A biodegradation study is not scientifically justified. In addition, carbon black is highly insoluble in water.
Transformation products:
no

Description of key information

As an inorganic substance with the chemical structure "C", carbon black cannot be used as a carbon source and will not be biodegraded by microorganisms. The generally accepted guidelines for the examination of  the biodegradability of substances (i.e., OECD- and EU-guidelines) can be used only for organic substances. A biodegradation study is not scientifically justified

Key value for chemical safety assessment

Additional information