Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Information on the substance itself is limited to a single, poorly documented study of inherent biodegradation. A large number of degradation tests are available for EDTA and its salts, a structural analogue of the substance (for justification on read-across see Section 13). Results from OECD guideline tests indicate that EDTA is not readily biodegradable and tests on inherent biodegradability result in low biodegradation rates.


EDTA, and by analogy HEDTA, has been shown that under special conditions like slightly alkaline pH or adaptation biodegradability is considerably improved. EDTA was biodegradable in an enhanced test using pre-adapted activated sludge. Therefore it can be concluded that the substance may be regarded as ultimately biodegradable under such conditions.