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Environmental fate & pathways

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Information on the environmental fate of EDTA-FeNa.3H2O is largely based on available information for EDTA and a number of its salts (e.g. EDTA-Na4, EDTA-Na2H2, EDTA-CaNa2). A justification for the read-across between these substances and EDTA-FeNa.3H2O is provided in a document attached to IUCLID section 13.

EDTA-FeNa.3H2O is expected to be resistant to hydrolysis, neither strong acids nor alkalis cause any degradation. Several studies show that Fe(III)-EDTA is photodegraded in natural water. Due to its low log Kow, the substance 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 considerable 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-FeNa.3H2O is not biodegradable in slightly 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-FeNa.3H2O is not Bioaccumulative (not B).

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