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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Key value for chemical safety assessment

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According to Regulation (EC) 1907/2006, Annex VIII, Column 2, a study does not need to be conducted if the substance can be expected to have a low potential for adsorption or the substance and its relevant degradation products decompose rapidly. Sodium 2,4-dichlorophenoxyacetate (CAS No. 2702-72-9) rapidly dissociates in water into 2,4-Dichlorophenoxyacetic acid (CAS No. 94-75-7). Therefore, the evaluation of this endpoint is based on the adsorption/desorption information of this substance. As the Koc value for 2,4-Dichlorophenoxyacetic acid is 56 (European Comission, 2001), low potential for adsorption of this substance to solid particles can be assumed.