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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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In accordance with Column 2 of Annex IX, sediment simulation testing may be waived if direct and indirect exposure of the sediment compartment is unlikely. The test substance is not supposed to be directly applied to sediments. Indirect exposure to sediments is unlikely to occur in significant dimensions since due to the extremely low water solubility, the substance will reach sewage treatment plants (STPs) in only very small amounts. In the STP, due to the high Koc the substance will distribute to a high extent to the sewage sludge. If any, only negligible amounts will reach surface water and sediment by the STP effluent. Therefore, exposure to sediment can be neglected.

Additionally, the analogous compound Di-(2-ethylhexyl)amine (CAS 106-20-7) turned out to be moderately biodegradable (not readily biodegradable). The same result may be applied to biodegradation simulation testing in water and sediment.

Moreover, the risk characterisation ratio (RCR) does not indicate the need for further investigation of risks for the sediment compartment (RCR < 1).