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Ecotoxicological information

Endpoint summary

Administrative data

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Additional information

As carbon black is insoluble in water, modifications are required to the standard ecotoxicity test procedures. These have taken two forms. In one, suspensions of carbon black are maintained through stirring or aeration while the test is carried out. These tests may be influenced by the lowering of solution pH caused by some types of carbon blacks, or by the physical presence of the particles themselves. In the other modification, carbon blacks at various concentrations are equilibrated with water at or just above ambient temperatures, typically for 24 hours or less. The suspensions are then filtered, and the filtrates used in the standard tests. The lowering of solution pH due to some carbon blacks may also influence these tests. This second type of test has the potential to demonstrate the ecotoxicity of aqueous extracts of carbon black, and of any water-removable adsorbates.