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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Description of key information


Key value for chemical safety assessment

Koc at 20 °C:
116 000

Additional information

According to the REACH Regulation (EC n. 1907/2006), Annex VIII, Column 2, the study does not need to be conducted when the physicochemical properties the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient) or the substance and its relevant degradation products decompose rapidly . Even though the predicted log Kow value for this substance is 6.13, dioctyl phosphate is ready biodegradable (90 % of biodegradation in 28 days) and so the second waiving criteria is fulfilled.

A predicted value for partition coefficient organic carbon-water was calculated by EUSES 2.1.2 Koc = 1.16*10^5 l/kg. This value was used by CHESAR for chemical safety assessment. As reported in ECHA Guidance Chapter R.7b: in general substances with a Koc <500 – 1000 l/kg are not likely sorbed to sediment (SETAC 1993) and log Koc or log Kow of ≥ 3 is used as a trigger value for sediment effects assessment although other considerations or combinations of triggers might be important as well (e.g. binding to sediment particles that is not Kow/Koc driven, but where for instance the distribution coefficient Kd is important, persistence in the sediment compartment). For Dioctyl phosphonate the predicted Koc value 1.16 *10^5 l/kg equivalent to log Koc = 5.06 raises no concern for adsorption/desorption because the substance is ready-biodegradable.