Registration Dossier

Environmental fate & pathways

Adsorption / desorption

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Description of key information

In a GLP-study similar to OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method) and also to EPA N 163 -1 using four soils, the absorption coefficient of the test substance was determined to be in the range of 351 to 630 (geometric mean: 514.98) with desorption coefficients between 526 and 934 ml/g (depending on the soil).

Key value for chemical safety assessment

Koc at 20 °C:
527.3

Additional information

The adsorption and desorption the registered substance was determined in four soils namely a sandy loam (Soil I, California Porterville), a loamy sand (Soil II, Illinois 1A), a silt loam (Soil III, Illinois, Site 1) and a loam (Soil IV, Iowa 1A) using radio-labelling.

The total recoveries obtained for the highest concentrations were in a range of 98.6% and 103.2% of the radioactivity applied.

The mean of the four respective Koc was calculated to be 527.3.