Registration Dossier
Registration Dossier
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EC number: 240-505-5 | CAS number: 16455-61-1
Endpoint summary
Administrative data
Description of key information
General consideration
Studies with o,o-Fe(Na)EDDHA are not available for endpoints concerning environmental fate and pathways. Read-across from the closely related substancesFe(Na)EDDHMA (CAS84539-53-7), and Fe(Na)EDDHA (CAS 84539 -55 -9) was performed instead. For further details, please refer to the read-across statement attached to the IUCLID file.
Hydrolysis
Based on the chemical structure of o,o-Fe(Na)EDDHA no hydrolysis is expected as no hydrolysable groups are present. The substance can thus be regarded as hydrolytically stable. This is further supported by its application and use in aqueous solution as fertiliser. The investigations of single EDDHA o-o and o-p isomers chelated with Fe3+ regarding their species distribution in nutrient solution, hydroponic, and soil conditions revealed no hydrolised species at environmentally relevant pH (4 -9) (Yunta et al., 2003a,b). Ahrland et al. (1990) concluded that EDDHA/Fe3+ did not hydrolyse even in the most alkaline soils (pH >9).
Phototransformation in air and water
Abiotic degradation takes predominately place by photolysis as shown in a study with the source substance Fe(Na)EDDHMA (Notox B.V., 1996). The half-life time for phototransformation of Fe(Na)EDDHMA at 25 +/- 3 °C is determined to be 40.66 and 35.40 hours for the two major compartments of this UVCB substance, at a light intensity of 4.86E20 photons/second in the wavelength range of 290 - 500 nm.
The chelating agent EDDHA is rather stable to photodegradationin air, Fe3+-EDDHA is very persistent for this pathway (Gómez-Gallego et al., 2005). In a photodegradation study in water, EDDHA/Fe3+ is progressively degraded along a 30 day period when it was exposed to direct sunlight in water (Hernández-Apaolaza and Lucena, 2010).
Biodegradability
The source substance Fe(Na)EDDHA showed only slow biodegradation under standard conditions. A guideline study accomplished according to OECD 301A detected 10 - 20 % degradation based on DOC removal after an incubation time of 28 days (BASF, 2010).
Additional information
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