Registration Dossier
Registration Dossier
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EC number: 227-105-6 | CAS number: 5657-17-0
Sediment toxicity
Administrative data
Link to relevant study record(s)
- Endpoint:
- sediment toxicity: short-term
- Data waiving:
- other justification
- Justification for data waiving:
- other:
Reference
Description of key information
Due to the ionic structure at environmental relevant pH conditions, no adsorption onto soils, sediments or sludge is expected. H2 -ED2A will be preferably partition to pore water (see 5.4.3 distribution modelling). Therefore no further tests on sediment organisms were provided.
Finally H2 -ED2A was shown to be biodegradable in water under enhanced conditions (see chapter 5.2.1).
Key value for chemical safety assessment
Additional information
No ecotoxicity data is currently available for H2 ED2A. For bridging purposes currently an algae and short term daphnia test are running with H2 ED2A. In the absence of actual measured data for H2 ED2A, consistent with the other ecotoxicity endpoints, the available data from H4 EDTA are read-across to fill the datagaps. All ecotox, fate and phys-chem data from H4 EDTA, Na2H2 EDTA, Na4 EDTA, HEDTA, H2 ED2A etc have been collated in a document which is compiled to justify the read across. This document is included in IUCLID 6, Chapter 13.
According to the EU Risk Assessment (2004) no adsorption onto the organic fraction of soil or sediments is expected, due to the ionic structure under environmental relevant pH conditions. In addition, according to the monitoring data of Virtapohja (2000) (please refer to IUCLID 5, 5.5.1) the concentration of adsorbed EDTA in the sediment is negligible. However, the mortality of Tubifex tubifex on H4 EDTA and Na2H2 EDTA was examined in a non-guideline study [Jancovic & Mann, 1969], for justification of read-across see IUCLID 5, chapter 13. The 24h LC100 values ranged between 380 mg/L for H4 EDTA and 2000 mg/L for Na2H2 EDTA. As such high values are not expected to occur under natural conditions in the sediment no risk to sediment dwelling organisms is considered.
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