Registration Dossier
Registration Dossier
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EC number: 289-064-0 | CAS number: 85959-68-8
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 6.1 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 3 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.61 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 49 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- no exposure of sediment expected
Sediment (marine water)
- Hazard assessment conclusion:
- no exposure of sediment expected
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.37 mg/kg soil dw
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
PNEC values for the aquatic compartment have been derived using a combination of short-term toxicity data for the test substance and long-term data for structurally related substances (see IUCLID section 13 for read-across document).
DTPA is not expected to adsorb to soils or sediments based upon the known behaviour of EDTA, a structural analogue and its low log Kow and high water solubility. In a laboratory test, solutions of H4-EDTA and Zn-EDTA were eluted through various surface soils and were found to move quite readily through the soils and be only very slightly adsorbed. A model calculation of the distribution of EDTA metal complexes between water and suspended solids resulted in a finding that <1% of the total EDTA is adsorbed, and according to the fugacity model Mackay level I, the preferred environmental component for EDTA is the hydrosphere (99.999%).
Read-across from EDTA to DTPA is supported by the fact that the EDTA and DTPA have similar chemical structures and the same mechanism of action (chelation of metals). Thus, based on a read across approach from EDTA, low adsorption is predicted for DTPA.
Conclusion on classification
There is no environmental classification requirement for DTPA-Fe(NH4)2 since the lowest reliable acute toxicity value was greater than 100 mg/L.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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