Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Information on the environmental fate of EDTA-MnNa2 is largely based on available information for EDTA and a number of its salts (e.g. EDTA-Na4, EDTA-Na2H2, EDTA-CaNa2, Fe(III)-EDTA). A justification for the read-across between these substances and EDTA-MnNa2 is provided in a document attached to IUCLID section 13.

EDTA-MnNa2 is expected to be resistant to hydrolysis, neither strong acids nor alkalis cause any degradation. In the environment, the Fe(III)-EDTA complex may be formed. Several studies show that Fe(III)-EDTA is photodegraded in natural water. Due to its low log Kow, EDTA-MnNa2 does not significantly bioaccumulate in organisms. Based on the low log Kow together with the ionic structure of the substance under environmentally relevant conditions, no adsorption onto the organic fraction of sediments is expected.

A large number of degradation tests are available for EDTA and its salts. These tests show that EDTA is not readily biodegradable under the conditions of standard ready biodegradability tests. It was shown that under special conditions, like adaptation or slightly alkaline pH, which is realistic under environmental surface water conditions, the biodegradability of EDTA is considerably enhanced. Therefore it can be concluded that EDTA is ultimately biodegradable under such environmental conditions.

No biodegradation was observed in an activated sludge simulation test, but for soil non-standard investigations under various conditions showed that EDTA can be biodegraded in soil under aerobic conditions.

EDTA-MnNa2 is not biodegradable in slightly acidic soils. However oxidation of EDTAMnNa2 by Mn(III/IV) hydroxides is expected because the oxidation rate is greatly enhanced under acidic conditions. EDTA-MnNa2 is therefore considered as not persistent in acidic soils. It should however be noted that in surface water, it was shown that under special conditions like adaptation or slightly alkaline pH, which is realistic under environmental surface water conditions, the biodegradability of EDTA is considerably enhanced. Therefore it can be concluded that EDTA is ultimately biodegradable under such environmental conditions. Based on its low log Kow, EDTA-MnNa2 is not Bioaccumulative (not B).