Registration Dossier
Registration Dossier
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EC number: 205-759-3 | CAS number: 150-39-0
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Koc is likely to be in the order of 2.138E-07 L/kg with the substance in its salt form.
Key value for chemical safety assessment
- Koc at 20 °C:
- 0
Additional information
The adsorption/desorption coefficient for HEDTA or its structural analogue EDTA has not been determined in experimental studies. Due to the ionic structure under environmentally relevant pH conditions, no adsorption onto the organic fraction of soil or sediments is expected (EU Risk Assessment, 2004). HEDTA is expected to behave in a similar manner to EDTA given their similar ionisation and binding potentials. As such it is likely that HEDTA will remain in salt form in typical environmental conditions (e.g. neutral to mild acidic/alkaline conditions). Based on QSAR modelling (KOCWIN) the Koc is likely to be in the order of 2.138E-07 L/kg in salt form. In highly alkaline conditions the Koc is estimated to be in the order of 10 L/kg for the ionised compound. It should also be noted that, in accordance with REACH Regulation 1907/2006, Annex VIII, Column 2 an Adsorption/Desporption screen does not need to be conducted as HEDTA has a low potential for adsorption based on a log Pow of -11.36.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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