Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Hydrolysis

'Reaction mass of benzyl 2-ethylhexyl adipate and bis(2-ethylhexyl) adipate and dibenzyl adipate' is of low water solubility and readily biodegradable, therefore hydrolysis is not considered as relevant for the environmental fate. In a water solubility study, it was shown, that 'Reaction mass of benzyl 2-ethylhexyl adipate and bis(2-ethylhexyl) adipate and dibenzyl adipate' was stable for at least 72 hours at 30°C.

Biodegradation

'Reaction mass of benzyl 2-ethylhexyl adipate and bis(2-ethylhexyl) adipate and dibenzyl adipate' is readly biodegradable, 62 % biodegradation was observed within 28 days. The criterion of the 10-day window does not apply, in accordance with "REACH Guidance R.7b Endpoint specific Guidance" (2017) as the substance is considered a multiconstituent substance. Therefore, 'Reaction mass of benzyl 2-ethylhexyl adipate and bis(2-ethylhexyl) adipate and dibenzyl adipate' will not persist in any environmental compartment.

Bioaccumulation:

The bioconcentration factor (BCF) of 'Reaction mass of benzyl 2-ethylhexyl adipate and bis(2-ethylhexyl) adipate and dibenzyl adipate' was predicted using the Estimation Program Interface (EPI) Suite version 4.1.

The estimation yielded a BCF of 358.4 L/kg wwt for benzyl 2-ethylhexyl adipate, a BCF of 957.1 L/kg wwt for bis(2-ethylhexyl) adipate and a BCF of 685.4 L/kg wwt for dibenzyl adipate.

Additionally, bioaccumulation of one constituent of 'Reaction mass of benzyl 2-ethylhexyl adipate and bis(2-ethylhexyl) adipate and dibenzyl adipate' (bis(2-ethylhexyl) adipate) on Lepomis macrchirus was tested in a flow through test according to American national standard ASTM. For bis(2-ethylhexyl) adipate a whole-fish BCF of 27 was observed, indicating no significant bioaccumulation in fish. Based on this result, it is assumed that also the other two constituents of 'Reaction mass of benzyl 2-ethylhexyl adipate and bis(2-ethylhexyl) adipate and dibenzyl adipate' (benzyl 2-ethylhexyl adipate and dibenzyl adipate) will not be accumulative.

Adsorptiton / desorption:

The organic carbon partition coefficient (log Koc) of 'Reaction mass of benzyl 2-ethylhexyl adipate and bis(2-ethylhexyl) adipate and dibenzyl adipate' was predicted using the Estimation Program Interface (EPI) Suite version 4.1.

The estimated Koc values in the range of 2811 to 192900 L/kg (log Koc in the range of 3.45 to 5.29) indicate a potential for adsorption.