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Environmental fate & pathways

Adsorption / desorption

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Description of key information

log Koc 6.12  (Koc 1,320,000) at 30 °C, HPLC estimation, OECD 121, Grenier 2012

Key value for chemical safety assessment

Koc at 20 °C:
1 320 000

Additional information

The adsorption coefficient of the test material was determined in a GLP study which was conducted in accordance with the standardised guideline OECD 121 using a High Performance Liquid Chromatography (HPLC) method. During the study, a series of chemicals with well characterised partition coefficients were injected onto the analytical column which was then followed by an injection of the test material. The retention of each chemical injected onto such a column is in proportion to the adsorption coefficient of each chemical, with water soluble chemicals eluting first and oil-soluble chemicals last. The adsorption coefficient of the test material was deduced from the capacity factor k’, using a calibration plot of log k’ versus log Koc of the reference compounds.


Under the conditions of the study the pH of the aqueous mobile phase was 7.00. The temperature during the Koc determination was maintained at approximately 30 °C via the HPLC column heater. The mean Koc for the test material was determined to be greater than the Koc for DDT (log Koc = 5.63) and was therefore extrapolated above the standard curve to be 1,320,000 (log Koc = 6.12 ± 0.0250). The duplicate values of the log Koc for the test material were considered acceptable since they fell within a range of ± 0.25 log units. The retention time of the test material for each sample was 9.423 and 9.424 minutes.

The study was performed in line with GLP and an accepted standardised guideline with a high standard of reporting. The study was assigned a reliability score of 1 and considered suitable for assessment as an accurate reflection of the substance.

The available data are considered to be complete and the result determined, Koc 1,320,000 at 30 °C, was taken forward for risk assessment.

It is considered unnecessary to undertake additional testing to further investigate this endpoint.

[LogKoc: 6.12]