Registration Dossier
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EC number: 824-774-1 | CAS number: 148124-40-7
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
According to the EU RAR for EDTA-H4 (60-00-4), no adsorption onto the organic fraction of sediments is expected due to the ionic structure under environmentally relevant pH conditions. Furthermore, EDTA is not persistent and ultimately biodegradable. For these reasons, a sediment simulation test is waived.
EDTA was not found to be readily biodegradable according to OECD criteria. In standard OECD 301D ready biodegradability tests with natural river water as inoculum it was shown that EDTA complexes with a stability constant lower than 10E13 like EDTA-Na4, EDTA-CaNa2, EDTA-MnK2 etc. less than 60% biodegradation was observed after 28 days indicating that these substances should indeed not be classified as readily biodegradable. In these same tests however > 60% biodegradation was observed when these tests are prolonged to day 60 (Ginkel 2018) indicating that these compexes, having stability constants < 10E13, are ultimately biodegradable and should be classified as "not persistent".
Based on the expected negligible sorption to sludge and the stability constant concept, with EDTA-Fe(OH)K2 having a stability constant clearly > 10E13, no significant removal of EDTA-Fe(OH)K2 in a standard STP is expected. In dedicated industrial WWTP's however, where the treatment conditions are well managed, significant degradation of EDTA, originating from the EDTA-Fe(OH)K2 complex, should be possible.
Key value for chemical safety assessment
Additional information
In an activated sludge simulation test (BASF, 1990), no biodegradation of EDTA (see IUCLID section 13 for read-across justification) was observed under the conditions of the test (0 -10% based on DOC removal after 70 days).
According to the EU RAR for EDTA (60-00-4), no adsorption onto the organic fraction of sediments is expected due to the ionic structure under environmentally relevant pH conditions. Furthermore, the substance is ultimately biodegradable. For these reasons, a sediment simulation test is waived.
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