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Environmental fate & pathways

Biodegradation in soil

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Key value for chemical safety assessment

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It is considered to be technically not feasible to conduct a soil degradation study with F-D3 due to its high volatilisation potential, as indicated by a very high Henry’s Law Constant (2.96E+10 Pa m3mol-1at 25°C) and high air-soil partition coefficient (Kair-soil­= 4.9 at 25°C). OECD TG 307 indicates that the method cannot be applied to chemicals which are highly volatile from soil, and thus cannot be kept in soil under the experimental conditions of the test.

In addition, the chemical safety assessment according to REACH Annex I indicates that it is not necessary to conduct the soil simulation test as exposure of the terrestrial compartment is unlikely or negligible because:

- The substance is classified for severe human health effects therefore measures are in place to minimise exposure. These control measures to prevent human health exposure will also control environmental exposure.

- Based on the physicochemical properties and very high value of Koc, any of the substance entering a wastewater treatment plant (WWTP) in influent waste waters is predicted to partition mainly to sludge (a small proportion may be volatilised), with a negligible amount passing to water. WWTP sludge from all sites handling the substance is incinerated.