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Environmental fate & pathways

Biodegradation in soil

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In accordance with Column 2 of Annex IX, soil simulation testing may be waived if direct and indirect exposure of the soil compartment is unlikely. The test substance is not supposed to be directly applied to soil. Indirect exposure to soil 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. If any, relevant amounts of the substance will reach industrial STPs rather than domestic STPs. Sludge of industrial STPs will usually not be applied on agricultural soil but will be incinerated. Therefore, exposure to soil can be neglected.

Additionally, the analogous compound Di-(2-ethylhexyl)amine (CAS 106-20-7) turned out to be moderately biodegradable (not readily biodegradable) in a ready test according to OECD TG 301B. The same result may be applied to biodegradation simulation testing in soil.

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