Registration Dossier

Physical & Chemical properties

Partition coefficient

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Administrative data

Link to relevant study record(s)

Description of key information

The following information is available for this endpoint:
MacGregor, J.A. and Nixon, W.B. (1997) Hexabromocyclododecane (HBCD): Determination of n-octanol/water partition coefficient, Wildlife International Ltd., 8598 Commerce Drive, Easton, Maryland 21601, 439C-104, Chemical Manufacturers Association's Brominated Flame Retardant Industry Panel, 1300 Wilson Boulevard, Arlington, Virginia 22209, 23/05/1997.
Hayward, S.J., Lei, Y.D & Wania, F. (2006) Comparative Evaluation of Three High-Performance Liquid Chromatography-Based Kow Estimation Methods for Highly Hydrophobic Organic Compounds: Polybroiminated Diphenyl Ethers and Hexabromocyclododecane, Environmental Toxicology and Chemistry (2006), Vol. 25, No. 8, PP. 2018-2027.
MacGregor & Nixon (1997) was selected as the key study based upon the reliability score of 2 assigned according to the criteria of Klimisch et al. (1997) and the thorough reporting of methodologies and results.
Hayward et al, 2006, was also scored 2 for reliability according to the same criteria, however provided less complete reporting of methodologies and results. Hayward et al, 2006, also used none-standard test methodologies which further reduced the reliability of the result.

Key value for chemical safety assessment

Log Kow (Log Pow):
5.625
at the temperature of:
25 °C

Additional information

The measured log Kow of the commercial product was 5.625 at 25 ºC ± 0.005 ºC (MacGregor and Nixon (1997)). A literature report of the individual diastereomers (Hayward et al. (2006)) is consistent with this result.

α-isomer: 5.07 ± 0.09

ß-isomer: 5.12 ± 0.09

γ-isomer: 5.47 ± 0.1