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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Due to the ionic structure no adsorption onto the organic fraction of soil or sediments is expected.

The estimated log Koc for EDTA-CuNa2  is 1 (worst case, MCI method) (Zvinavashe).  

Key value for chemical safety assessment

Koc at 20 °C:
10

Additional information

Due to the ionic structure under environmental relevant pH conditions, no adsorption onto the organic fraction of soil or sediments is expected [EU Risk Assessment, 2004]. This are confirmed by experimental results where EDTA was almost entirely present in the form of negatively-charged complexes with alkaline earth and trace metals, and neither of these complexes nor the free or protonated ligand itself could have been significantly adsorbedon the surfaces of the solids [Gardiner, 1976]. Further on, it is confirmed due to the low log Pow of -3.86, in accordance with column 2 of REACH Annex VIII, that an Adsorption /Desorption -Screening test (required in section 9.3.1) does not need to be conducted.