Registration Dossier
Registration Dossier
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EC number: 205-759-3 | CAS number: 150-39-0
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Phototransformation in air is no requirement under REACH.
Key value for chemical safety assessment
- Half-life in air:
- 2.2 h
- Degradation rate constant with OH radicals:
- 0 cm³ molecule-1 s-1
Additional information
Generally, both HEDTA and its surrogate (EDTA) are used in aqueous solutions. For both substances, there is expected to be no emission into the atmosphere when the very low vapour pressure is considered. Emission to the atmosphere of EDTA (and, by analogy, HEDTA) could appear in dust form during production [EU Risk Assessment, 2004].
Based on a calculation according to AOPWIN v1.92, both HEDTA and its surrogate EDTA is expected to be indirectly photodegraded by reaction with hydroxyl radicals in the atmosphere with a half-life (t1/2) of approximetaly 2 hours taking into account a 24-h day and a mean OH radical concentration of 0.5E06 radicals per cm³.
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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