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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Hazard for aquatic organisms

Hazard for air

Hazard for terrestrial organisms

Hazard for predators

Additional information

Conclusion on classification

Based on the ecotoxicological data available in IUCLID section 6, aquatic invertebrates appear more sensitive to dysprosium trinitrate than fish and are thus the species that drive the environmental classification.

For this most sensitive trophic level, acute toxicity was assessed on the basis of:

- two studies included in a weight-of-evidence approach: EC50 in the range 0.372-0.488 mg Dy/L (equivalent to 0.798-1.046 mg Dy(NO3)3/L)

- and five supporting studies: EC50 in the range 0.162-9.1 mg Dy/L (equivalent to 0.347-19.517 mg Dy(NO3)3/L)

Clearly, the lowest EC50 values are below the threshold of 1 mg/L which triggers a classification in aquatic acute toxicity cat. 1 (H400, M acute = 1).

For this most sensitive trophic level, chronic toxicity was assessed on the basis of:

- one key study: NOEC of 0.00574 mg Dy/L (equivalent to 0.0123 mg Dy(NO3)3/L)

- and one supporting study: NOEC < 0.2 mg Dy/L (equivalent to < 0.429 mg Dy(NO3)3/L)

Considering dysprosium trinitrate as not rapidly degradable (due to its inorganic nature), the key NOEC value is below the threshold of 0.1 mg/L which triggers a classification in aquatic chronic toxicity cat. 1 (H410, M chronic = 1).

Of note, toxicity to algae was not considered in this rationale based on the arguments provided in section 6.1.5.