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Environmental fate & pathways

Adsorption / desorption

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Description of key information

In accordance with column 2 of REACH Annex es XIII and IX, the adsorption / desorption study (required in section 9.3.1 and 9.3.3) do not need to be conducted as the substance and its relevant degradation products decompose rapidly. 
This expectation that ptBP decomposes rapidly is supported by the review of the information presented concerning biodegradation which indicates that ptBP is readily biodegradable.

Key value for chemical safety assessment

Additional information

Information regarding adsorption/desorption of ptBP was calculated using the Estimation Programs Interface (EPI) SuiteTM United States Environmental Protection Agency MPBPVP Program (v1.43), which predicted a value of 1286 L/kg from molecular connectivity indices (MDI) and a value of 837.2 L/kg from Log Kow. The high predicted adsorption coefficients indicate that ptBP will have a low mobility in soil.