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Adsorption / desorption

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Description of key information

The log of the adsorption coefficient (Koc) of FAT 40825/A was estimated to be log Koc <1.25 which is equal to a Koc value of <  18 using the HPLC method. This value indicates that FAT 40825/A will not be adsorbed by organic carbon in soil.

Key value for chemical safety assessment

Koc at 20 °C:
18

Additional information

The determination of the adsorption coefficient (Koc) of FAT 40825/A was performed according to the OECD Guideline for the Testing of Chemicals, No. 121, Estimation of the Adsorption Coefficient (Koc) on Soil and Sewage Sludge using High Performance Liquid Chromatography (HPLC), January, 2001.

The test item solution was injected three times and the reference solution was injected six times. FAT 40825/A was not retained under the chromatographic conditions of the test and was eluted at the dead time. The Koc of FAT 40825/A was therefore determined to be lower than that one of the lowest reference item used (acetanilide).

In conclusion, the log of the adsorption coefficient (Koc) of FAT 40825/A was estimated to be log Koc <1.25 which is equal to a Koc value of < 18 using the HPLC method. This value indicates that FAT 40825/A will not be adsorbed by organic carbon in soil.

[LogKoc: 1.25]

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