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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance has a low octanol water partition coefficient and the adsorption potential of this substance is related to this parameter
the study does not need to be conducted because the physicochemical properties of the substance indicate that it can be expected to have a low potential for adsorption
Justification for type of information:
Güsten and Sabljic (1995) have developed regression equations for two general sets of chemicals and for a number of specific classes of chemicals which allow the octanol-water partition coefficient of a chemical to be used to predict its potential for sorption by soil or sediment. A review of the chemical structure of OFPMA shows it to be a polyfluorinated methacrylate ester, that does not fall into any of those specific classes, so can only be assessed as a “non-hydrophobic” chemicals according to the equation.


log Koc = 0.52 log Kow + 1.02 (“non-hydrophobic” chemicals)

The octanol-water partition coefficient (log Kow) for the new chemical has been shown to have a value of log Kow = 3.03. Inserting this value into the equation:

log Koc = 0.52 x 3.03 + 1.02 = 2.60 Koc = 394

Reference:
Güsten H, Sabljic A (1995). QSARS for Soil Sorption. In: EC. Overview of Structure-Activity Relationships for Environmental Endpoints: Part 1: General Outline and Procedures: Report of the EU-DG-XII Project QSAR for Prediction of Fate and Effects of Chemicals in the Environment. European Commission (EC), Belgium, Chapter III, p. 6-13, 25-27. EV5V-CT92-0211 - Part 1.
Reason / purpose for cross-reference:
data waiving: supporting information

Description of key information

The adsorption/desorption screening study does not need to be conducted because the substance has a low octanol water partition coefficient and the adsorption potential of this substance is related to this parameter. Also, the physicochemical properties of the substance indicate that it can be expected to have a low potential for adsorption. The regression method of Güsten and Sabljic (1995) has predicted the log Koc value to be 2.60 (i.e., Koc = 394).

 

Reference:

Güsten H, Sabljic A (1995). QSARS for Soil Sorption. In: EC. Overview of Structure-Activity Relationships for Environmental Endpoints: Part 1: General Outline and Procedures: Report of the EU-DG-XII Project QSAR for Prediction of Fate and Effects of Chemicals in the Environment. European Commission (EC),, Chapter III, p. 6-13, 25-27. EV5V-CT92-0211 - Part 1.

Key value for chemical safety assessment

Koc at 20 °C:
394

Additional information

[LogKoc: 2.6]