Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint summary

Administrative data

Description of key information

Additional information


In general according to column 2 of REACH Annex VIII, a study for hydrolysis does not need to be conducted as bis(2-ethylhexyl) hydrogen phosphate is readily biodegradable.

Nevertheless in a read across approach with dibutyl hydrogen phosphate (CAS No. 107-66-4), the behaviour of bis(2-ethylhexyl) hydrogen phosphate against hydrolysis is assessed (OECD Guideline 111). Dibutyl hydrogen phosphate is shown to be stable at pH 4, 7 and 9 at 50°C. Therefore it can be assumed that also bis(2-ethylhexyl) hydrogen phosphate is stable against hydrolysis.


With 75 % degradation within 28 days in a ready biodegradation study bis(2-ethylhexyl) hydrogen phosphate is considered as readily biodegradable. Therefore, bis(2-ethylhexyl) hydrogen phosphate will not persist in any environmental compartment. The OECD Guideline 301F was applied.

Biodegradation (water/sediment, soil)

Bis(2-ethylhexyl) hydrogen phosphate is considered as readily biodegradable. Therefore, performance of a study in water/sediment and soil does not appear scientifically necessary.


According to OECD Guideline 305C with Cyprinus carpio as test organism BCF values lay in the range of 1.1 - 6.0. Determinations were conducted at concentrations of 0.1 and 1 mg/L. The received BCF values indicate that bis(2-ethylhexyl) hydrogen phosphate is not bioaccumulative.

Adsorption / desorption

Following the OECD Guideline 121 (HPLC method) a logKoc value of 2.4 was received. This value indicates that bis(2-ethylhexyl) hydrogen phosphate has a low sorption potential to soil and sediment.

Henry's Law Constant

The QSAR determination of the Henry's Law Constant for bis(2-ethylhexyl) hydrogen phosphate using the Estimation Program Interface (EPI) Suite v4.11 revealed a value of 0.00417 Pa*m³/mol at 25°C. This value indicates that bis(2-ethylhexyl) hydrogen phosphate is essentially non-volatile from water, and a long-range transport via the atmosphere is not expected.