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Environmental fate & pathways

Biodegradation in soil

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Biodegradation of DTO as a whole substance in soil
In accordance with Column 2 of REACH Annex IX, the biodegradation in soil study (required in Section 9.2.1.3) does not need to be conducted as the substance is readily biodegradable.
Biodegradation of DTO constituents in soil

No measured soil biodegradation data are available for constituents of DTO. An exposure assessment (Section 9 of the CSR) using EUSES 2.1.1 has been performed. The model has a very cautious approach to the estimation of biodegradation rate in the environment which is based on the TGD requirements. However, the rates are wholly unrealistic of what can reasonably be expected for naturally-occurring substances of high intrinsic degradability,and so a soil half-life of 30 days has been set for all constituent blocks of DTO. The significance of that decision is considered in Section 9 of the CSR.

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