Registration Dossier

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption
Remarks:
other: Koc estimation
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Accepted calculation method

Data source

Referenceopen allclose all

Title:
Technical Guidance Document on Risk Assessment
Author:
EU Commission
Year:
2003
Reference Type:
publication
Title:
No information
Reference Type:
publication
Title:
QSARs for soil sorption. In: Overview of Structure-Activity Relationships for Environmental Endpoints
Author:
Sabljic A and Güsten H
Year:
1995
Bibliographic source:
Hermens JLM (ed.), Report prepared within the framework of the project “QSAR for Prediction of Fate and Effects of Chemicals in the Environment" (EU Commission project DG XII/D-1)

Materials and methods

Principles of method if other than guideline:
Koc estimated via an accepted QSAR method

Test material

Constituent 1
Chemical structure
Reference substance name:
Pentafluoroethane
EC Number:
206-557-8
EC Name:
Pentafluoroethane
Cas Number:
354-33-6
Molecular formula:
C2HF5
IUPAC Name:
1,1,1,2,2-pentafluoroethane

Results and discussion

Partition coefficients
Phase system:
other: Koc
Type:
other: Koc
Value:
20 L/kg

Any other information on results incl. tables

The organic carbon-normalised partition coefficient was estimated by considering the equation for the domain of predominantly-hydrophobic substances reported in the EU TGD (2003) and the experimentally determined Log Kow (1.48). HFC 125 satisfies the criteria to be included in the selected domain (predominantly hydrophobics, domain criteria: Log Kow in the range 1 -7.5 and molecules containing C, H, F, Cl, Br, and I atoms) :

Log Koc = 0.81 LogKow + 0.10 = 0.81 * 1.48 + 0.10 = 1.30

Koc = 20 L/kg

Applicant's summary and conclusion