Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

2 -Ethylhexyl (diphenyl) phosphate is a liquid substance at ambient temperatures as indicated by its melting point of -30 deg.C.

The aqueous solubility of 2EHDPP is well below 1 mg/L (0.056 mg/L at 21 deg.C), which by definition, indicates that it is a “poorly soluble” substance. When poorly water soluble substances like 2EHDPP also have a specific gravity approximately equal to that of water, undissolved material may remain throughout the water column when the test material is added in excess to water.

The log Kow found is of 5.87 and a log Koc of 4.85 calculated using the "predominantly hydrophobic" (Q)SAR of EUSES 2.1.

The hydrolysis rate of 2-ethylhexyl diphenyl phosphate is temperature and pH-dependant. The half-life for hydrolysis at 35 degrees Celsius and pH 4 is 219 days and 102 -109 and 40.8 days at 25 degrees Celsius and pH's 7 and 9.

2 -Ethylhexyl (diphenyl) phosphate was found readily biodegradable in a screening test using OECD guideline 301B. By definition, 2EHDPP is a substance that “rapidly degrades”. In terms of bioaccumulation potential, a measured BCF of 934 is available. 2EHDPP is therefore, neither persistent nor bioaccumulative.