Registration Dossier
Registration Dossier
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EC number: 257-036-7 | CAS number: 51181-50-1
Endpoint summary
Administrative data
Description of key information
Additional information
No data for HEDTA and its salts are available for soil organisms.
Only one acute toxicity study with earthworms is available for EDTA-H4 (Edwards, 2009). The EC50 was determined at 156 mg/kg soil dry weight. This corresponds to 189 mg/kg soil dw HEDTA-FeNa.
Two acceptable studies with EDTA salts or complexes have been performed, examining different end-points (vegetative vigour and seedling emergence) in different plant species. In the 21d veg vigour study (Evangelou et al., 2006) a true NOEC could be established, while in the 14d seedling emergence test (Geebelen et al., 2002) no effect was observed at the highest tested dose. Recalculation of the NOEC from EDTA-Na2H2 to HEDTA-FeNa will give a NOEC of 88.6 mg/kg soil dw.
The hazard assessment of HEDTA-FeNa reveals neither a need to classify the substance as dangerous to the environment, nor is it a PBT or vPvB substance. The substance is expected to have a low potential for adsorption based on its ionic structure under environmental relevant pH conditions and its low log Kow , the low log Kow also indicates that the substance will not be bioaccumulative. There are no further indications that the substance may be hazardous to the environment.
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