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Biodegradation in water and sediment: simulation tests

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Key value for chemical safety assessment

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The simulation test on ultimate degradation in surface water and sediment simulation test study required in REACH guidance, Annex IX (Sections and do not need to be conducted as the substance is readily biodegradable. The chemical safety assessment also indicates that identification of degradation products (required in section 9.2.3) is not necessary. However, the simulation test of the substance could be determined based on available data for citric acid, since the substance will dissociate in aqueous solution to form the metal ion (K+) and citrate anion (H7C6O7-), exposure will be to the citrate and the metal ions separately.

A simulation in water and sediment test value of 93 ± 5 % has been determined for Citric acid in a test conducted according to OECD 303 A. The observed removal could be due to adsorption and/or degradation.