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Environmental fate & pathways

Adsorption / desorption

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Description of key information

From the Koc determination of FAT 41030 according to OECD 121 it was concluded, that both, FAT 41030 and FAT 41045 are immobile. 

Key value for chemical safety assessment

Koc at 20 °C:
10 000 000

Additional information

The adsorption coefficient (Koc) was determined for FAT 41'030, a structural analogue of FAT 41045, 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. Both substances are very similar in their chemical structure and, as demonstrated, in a number of physicochemical properties. Therefore, the use of this study for read-across is considered to be appropriate.


The test item solution was injected three times and the combined reference solution was injected six times. The log Koc was extrapolated using a regression curve (log k' vs. log Koc). The reference items covered the range of log Koc 1.32 (phenol) to log Koc 5.63 (2,4-DDT).The retention time of the three test item peaks of FAT 41'030/A were above the retention time of the highest reference material 2,4-DDT. Therefore the log Koc of FAT 41'030/A was extrapolated to be 6.3 (first peak), 6.6 (second peak) and 7.0 (third peak) from the regression curve. The Koc of FAT 41'030/A was calculated to be 1995262 (first peak), 3981072 (second peak) and 10000000 (third peak).Thus both, FAT 41030 and FAT 41045 are immobile.

[LogKoc: 7.0]