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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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According to Annex IX, Section 9.2.1.2 column 2 of REACH Regulation (EC) No 1907/2006 a study on simulation testing on ultimate degradation in surface water does need not to be conducted, if the substance is highly insoluble in water. Additionally, the substance was determined to be poorly biodegradable in water according to OECD 301B. Comparable degradation rates are expected for biodegradation in water and sediment. In addition, a biodegradation in water and sediment simulation test does need not to be conducted, if the substance can be expected to have a low potential for adsorption to the sediment. A log kow of 1.78 was determined which indicates low potential for adsorption to sediment (log kow <3; following REACh guidance Document R7.1.15.4). Additionally, the substance has no cationic properties and the calculated logKoc of 2.77 also indicates low potential for adsorption to solid soil/sediment (following Table R.7.11-2, REACh-Guidance Documents). Thus, a simulation test on biodegradation in water and sediment needs not to be conducted.

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