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Environmental fate & pathways

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Both HEDTA and its surrogate, EDTA, form complexes with ions. Therefore both exist naturally as a mixture of chelate complexes (for justification for read-across see Section 13).

There is expected to be no emission into the atmosphere when the very low vapour pressure of the substance(s) is considered. Thus photodegradation in air, will not play an important role in degradation processes in the environment.

Both HEDTA and its surrogate, EDTA, are resistant to hydrolysis, neither strong acids nor alkalis cause any degradation. However photodegradation of EDTA in natural water has been observed by Metsärine (2001) and some species of EDTA, especially the iron complex, are potentially photolysable