Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Adsorption / desorption

The adsorption coefficient (Koc) on soil and on sewage sludge using high performance liquid chromatography (HPLC) has been estimated for a phthalate ester with C-11 chain length. Adsorption coefficients were estimated to be log Koc soil = 21.41 and log Koc sewage sludge = 23.21.

 

The adsorption coefficient (Koc) on soil and on sewage sludge using high performance liquid chromatography (HPLC) has also been determined for a phthalate ester with C-6 to C-10 chain length. Adsorption coefficients were estimated to be log Koc soil = 5.55-10.37 and log Koc sewage sludge = 6.29-12.09.

 

In addition the adsorption coefficient (Koc) of the substance, a phthalate ester with chain length of C9 to C-11, has been estimated using calculation methods to yield a log Koc of 6.397. This value is lower than that obtained experimentally on two analogous substances and is likely to be an under-estimate.

 

In all cases, the McCall classification scheme classifies the substances as immobile in soil (Koc > 5000).

Henry's Law constant

The Henry's Law constant of 4.88 Pa-m3/mole indicates that the substance is moderately volatile from surface water.

Distribution modelling

Distribution in environmental compartments has been calculated using a Fugacity model according to Mackay, Level III. Distribution in various environmental compartments is estimated as: Air - 0.43%; Water - 3.5%; Soil - 27.2% and Sediment - 68.8%.

Sediment and soil were then found to be the major target compartments.