Registration Dossier
Registration Dossier
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EC number: 275-554-1 | CAS number: 71501-24-1
Hydrolysis
Administrative data
Link to relevant study record(s)
- Endpoint:
- hydrolysis
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
- Justification for type of information:
- According to the EU Risk Assessment report for EDTA, "the results of standard biodegradation tests can not be used for the exposure assessment. It was demonstrated by laboratory tests that biodegradation of EDTA is strongly dependent on the complexed metal. Metal-EDTA complexes with a thermodynamic stability constant below 10^12, like Ca, Mg and Mn, were degraded under special conditions, while chelates with stability constants above 10^12, such as Cu, Zn and Fe, are recalcitrant."
For metal chelates with EDTA or similar structure (DTPA, HEDTA), hydrolysis is thus expected to be minimal in standard conditions.
For Fe(III)EDTA, photodegradation was found to be the dominant degradation process in aqeous solution and therefore, this is also expected for other metal chelates with EDTA and related structures (DTPA, HEDTA).
In conclusion, it is expected that photodegradation is the dominant degradation process in water for this metal chelate. Hydrolysis is expected to be minimal.
Reference
Description of key information
According to the EU Risk Assessment report for EDTA, "the results of standard biodegradation tests can not be used for the exposure assessment. It was demonstrated by laboratory tests that biodegradation of EDTA is strongly dependent on the complexed metal. Metal-EDTA complexes with a thermodynamic stability constant below 10^12, like Ca, Mg and Mn, were degraded under special conditions, while chelates with stability constants above 10^12, such as Cu, Zn and Fe, are recalcitrant."
For metal chelates with EDTA or similar structure (DTPA, HEDTA), hydrolysis is thus expected to be minimal in standard conditions.
For Fe(III)EDTA, photodegradation was found to be the dominant degradation process in aqeous solution and therefore, this is also expected for other metal chelates with EDTA and related structures (DTPA, HEDTA).
In conclusion, it is expected that photodegradation is the dominant degradation process in water for this metal chelate. Hydrolysis is expected to be minimal. No test was therefore performed for the substance.
Key value for chemical safety assessment
Additional information
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