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Environmental fate & pathways

Adsorption / desorption

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Description of key information

- Koc value (20°C): max 15 mL/g (OECD guideline 106)
- Kd value (20°C): max 0.31 mL/g (OECD guideline 106)
- Desorption (20°C): 0 - 25% of the adsorbed amount within 48h (OECD guideline 106)

Key value for chemical safety assessment

Additional information

One study is reported for this endpoint. This study assessed the adsorption/desorption potential of sodium hypophosphite using five soils and the batch equilibrium method according to the OECD guideline 106. For one out of five tested soils no consistent adsorption was seen, while for the other four soils adsorption represented 10 to 24%. For these soils the Kd values ranged between 0.11 and 0.31 mL/g, with corresponding Koc values ranging from 3.7 to 15 mL/g.

Desorption could only be determined in one soil, where up to 25% of the adsorbed amount could be recovered within 48 h. In the other soils, the apparent amounts desorbed were zero (quantification not possible due to the high background concentrations in the residual water).