Registration Dossier
Registration Dossier
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EC number: 283-042-4 | CAS number: 84539-54-8
Endpoint summary
Administrative data
Description of key information
Additional information
General consideration
Studies with Fe(3Na)EDDHSA (CAS 84539-54-8 ) are not available for endpoints concerning environmental fate and pathways. Read-across from the closely related substances Fe(Na)EDDHMA (CAS 84539-53-7), Fe(3K)EDDHSA 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 structure of Fe(3Na)EDDHSA 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 and also by the fact that the read-across substance Fe(3K)EDDHSA was also found to be stable in water according to EU Method C.7 at pH 4, 7 and 9 (Groult, 2001). The half-life at 25 °C will be greater than 1 year.
Phototransformation in air and water
Abiotic degradation takes predominately place by photolysis as shown in a study with the read across 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.
EDDHA/Fe3+ is progressively degraded along a 30 day period when it was exposed to direct sunlight in water (Hernández-Apaolaza and Lucena, 2010). The degradation products (Salicyladehide, salicyclic acid and Salicylaldehydeethylenediamine diimine) did not affect biomass production of soybean plants.
The chelating agent EDDHA is rather stable to photodegradation in air, Fe3+-EDDHA is very persistent for this pathway (Gómez-Gallego et al., 2005).
Biodegradability
Fe(3K)EDDHSA is regarded as not readily biodegradable by attaining 39 % degradation after 28 days in an OECD 301B Guideline experiment (L´Haridon, 2001). Also 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 (Schwarz, 2010). Especially the result obtained by L´Haridon indicates that the compound is probably ultimately biodegradable.
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