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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The following adsorption/desorption distribution coefficients were obtained for the analogous test materials Lanthanum oxide and cerium carbonate at the soil-to-solution ratio of 1/50:
- Mean Koc value: 5480283, 3940404, respectively
As a representative value, the lower mean value was used as the key value.

Key value for chemical safety assessment

Koc at 20 °C:
3 940 404

Additional information

The adsorption/desorption behaviour of the read-across test materials on soil was determined using three soils and the batch equilibrium method in accordance with the standardised guideline OECD 106.

Lanthanum oxide

Adsorption: The Kd values amounted to 5451, 46861 and 216905 mL/g for soils I to III, respectively, with corresponding Koc values of 230978, 4733400 and 11476472 mL/g, respectively. The mean value was 5480283 ml/g Desorption: The Kd des values were 15203, 2641, 30858 mL/g for soils I to III, respectively, with corresponding Koc des of 644212, 266724 and 163702 mL/g, respectively.

Cerium Carbonate

Adsorption: The Kd values amounted to 11784, 59264 and >100843 mL/g for soils I to III, respectively, with corresponding Koc values of 499332, 5986256 and >5335623 mL/g, respectively. Desorption: The Kd des values were 10147, 102180, > 225268 mL/g for soils I to III, respectively, with corresponding Koc des of 429968, 10321193 and >11918936 mL/g respectively.

[LogKoc: 6.6]