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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The environmental fate properties of the 2 -ethylhexyl diphenyl phosphite (2 -EHDPP) and related phenyl/alkyl phosphites generally include: low water solubility, low vapor pressure, and rapid hydrolysis to phosphorous acid and corresponding alcohols (in the case of 2 -EHDPP it is 2 mole of phenol and 1 mole of 2 -ethylhexanol).

In fugacity Level III modeling with equal emissions to all three compartments or with just emissions to water, the majority of the category members partition to the soil and sediment. With emissions to just air or soil, the majority of the releases partition to the soil compartment. 

A recent OECD 301D biodegradation study on TPP (van Ginkel, 2015), a constituent of 2 -EHDPP and close analog, showed that this substance is readily biodegradable. The 28 -day degradation of TPP in this study was 84%. These results are also consistent with the expectation that the phosphites rapidly hydrolyze to phenol and other alcohols, which are also readily biodegradable. The earlier TPP biodegradation study is now considered invalid as it appears that the study did not adequately address the very low water solubility of this substance. The new data demonstrate that TPP, and by association 2 -EHDPP, is not persistent.

Reliable bioaccumulation concentration factor (BCF) estimates for 2 -EHDPPare difficult to obtain due to the rapidly hydrolysis. However, it is because of this rapid hydrolysis that the potential for bioaccumulation is expected to be very low. BCF values from the BCFBAF v3.00 model are not considered reliable because they do not consider hydrolysis or biotranformation of the substance, both of which are expected to be high. The BCF of phenol (the primary hydrolysis product) is 17.5 L/Kg (EU Phenol RAR 2006) and the BCF of 2 -ethylhexanol is 25.3 L/kg (REACH dossier for 2 -ethylhexan-1), indicating that neither2 -EHDPP nor its hydrolysis products are expected to bioaccumulate and do not meet the criterion of B or vB.