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Environmental fate & pathways

Adsorption / desorption

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Description of key information

log KOC 7.1

Key value for chemical safety assessment

Koc at 20 °C:
12 127 811

Additional information

The determination of the adsorption coefficient (KOC) of the test item was performed according to the OECD Guideline No. 121, Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge using High Performance Liquid Chromatography (HPLC), January, 2001 and the EC Directive 2001/59, C.19.
The test item solution was injected three times and the combined reference solution was injected six times. The log KOC of the test item was extrapolated from using a regression curve (log k' vs. log KOC) and was found to be 7.1, which is equal to a KOC value of 12127811. The retention time of the test item is higher than the retention of the highest reference item used (2,4-DDT) with log KOC 5.63, which is equal to a KOC value of 426580. In the present study the reference items covered the range of log KOC 1.25 to log KOC 5.63.
The chromatography of the test item resulted in one sharp main peak with a well-defined and reproducible retention time. The HPLC method was therefore considered to be suitable for the purpose of the study. Based on the chromatographic data, the test item  was considered to be stable during the test procedure.
The capacity factor (k’) was calculated for each reference item using the retention times. Log KOC was plotted versus log k’ for each component to obtain a regression curve.
The tabulated values represent rounded mean results, which were obtained by calculation using the exact raw data.
In conclusion, the log of the adsorption coefficient (KOC) of test item was estimated to be log KOC 7.1 which is equal to a KOC value of 12127811 using the HPLC method. This value indicates that the test item is immobile and remains preferably in soil.