Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 269-075-7 | CAS number: 68187-15-5 An inorganic pigment that is the reaction product of high temperature calcination in which praseodymium (III) oxide, praseodymium (IV) oxide, silicon oxide, and zirconium (IV) oxide in varying amounts are homogeneously and ionically interdiffused to form a crystalline matrix of zircon. Its composition may include any one or a combination of the modifiers alkali or alkaline earth halides.
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no hazard identified
Marine water
- Hazard assessment conclusion:
- no hazard identified
STP
- Hazard assessment conclusion:
- no hazard identified
Sediment (freshwater)
- Hazard assessment conclusion:
- no hazard identified
Sediment (marine water)
- Hazard assessment conclusion:
- no hazard identified
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no hazard identified
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Conclusion on classification
The poorly soluble substance zirconium praseodymium yellow zircon is evaluated by comparing the dissolved metal ion levels resulting from the transformation/dissolution test after 7 days (acute) and 28 days (chronic) at a loading rate of 1 mg/L with the lowest acute and chronic ecotoxicity reference values (ERVs) as determined for the (soluble) metal ions, respectively. The ERVs are based on the lowest EC50/LC50 (acute) or NOEC/EC10 (chronic) values for algae, invertebrates and fish. Acute and chronic ERVs were obtained from the Metals classification tool (MeClas) database as follows:
Regarding the short-term toxicity, hazard information for praseodymium is not included in the MeClas database. Nevertheless, soluble praseodymium salts (Praseodymium trichloride, EC 233-794-4, CAS 10361-79-2; Praseodymium trinitrate, EC 233-796-5, CAS 10361-80-5) are self-classified as Aquatic Acute 1 (M-factor 1) indicative of an L(E)C50 of > 0.1 ≤ 1 mg/L (https://echa.europa.eu/information-on-chemicals/cl-inventory-database, accessed on 12.03.2021), which is applied to evaluate the aquatic hazard potential of zirconium praseodymium yellow zircon. An acute ERV for silicon has not been derived since a concern for short-term (acute) toxicity of silicon ions was not identified. The acute ERV for zirconium in the MeClas database amounts to 74 mg Zr/L. According to ECHA’s Guidance on the Application of the CLP Criteria (Version 5.0, July 2017), “Where the acute ERV for the metal ions of concern is greater than 1 mg/L the metals need not be considered further in the classification scheme for acute hazard.” Metal release in the T/D test at the 1 mg/L loading and pH 6 resulted in dissolved concentrations of 2.10 µg/L Pr and 0.17 µg/L Zr after 7 days, whereas silicon concentrations remained below the LOD (< 0.07 µg/L Si). Due to the lack of an aquatic hazard potential for silicon and zirconium ions and the fact that dissolved praseodymium concentrations were well below the respective L(E)C50 estimate of > 0.1 ≤ 1 mg/L, it can be concluded that the substance zirconium praseodymium yellow zircon is not sufficiently soluble to cause short-term toxicity at the level of the acute ERVs (expressed as EC50/LC50).
Supporting studies (Munk, 1992; Neri, 2010) of the acute toxicity of zirconium praseodymium yellow zircon to zebra fish (Brachydanio rerio) and Pseudokirchneriella subcapitata support the conclusion since toxic effects were not observed at the limit test concentrations of 10,000 mg/L (nominal total concentration of dispersion) and 100 mg/L (nominal concentration of filtered fraction after 3-d stirring), respectively.
In accordance with Figure IV.4 “Classification strategy for determining acute aquatic hazard for metal compounds” of ECHA Guidance on the Application of the CLP Criteria (Version 5.0, July 2017) and section 4.1.2.10.2. of Regulation (EC) No 1272/2008, the substance zirconium praseodymium yellow zircon is poorly soluble and does not meet classification criteria for acute (short-term) aquatic hazard.
Regarding the long-term toxicity, hazard information for praseodymium is not included in the MeClas database. Nevertheless, soluble praseodymium salts (Praseodymium trichloride, EC 233-794-4, CAS 10361-79-2; Praseodymium trinitrate, EC 233-796-5, CAS 10361-80-5) are self-classified as Aquatic Chronic 1 (M-factor 1) indicative of a NOEC/EC10 of > 0.01 ≤ 0.1 mg/L (https://echa.europa.eu/information-on-chemicals/cl-inventory-database, accessed on 12.03.2021), which is applied to evaluate the aquatic hazard potential of zirconium praseodymium yellow zircon. A chronic ERV for silicon has not been derived since a concern for long-term (chronic) toxicity of silicon ions was not identified. A chronic ERV has also not been derived for zirconium. Metal release in the T/D test at the 1 mg/L loading and pH 6 resulted in dissolved concentrations of 0.79 µg/L Pr and < 0.08 µg/L Zr (< LOD) after 28 days, whereas silicon concentrations remained also below the LOD (< 0.07 µg/L Si). Due to the lack of an aquatic hazard potential for silicon and zirconium ions and the fact that dissolved praseodymium concentrations were well below the respective NOEC/EC10 estimate of > 0.01 ≤ 0.1 mg/L, it can be concluded that the substance zirconium praseodymium yellow zircon is not sufficiently soluble to cause long-term toxicity at the level of the chronic ERVs (expressed as NOEC/EC10).
A supporting study (Neri, 2010) of the toxicity of zirconium praseodymium yellow zircon to Pseudokirchneriella subcapitata supports the conclusion since toxic effects were not observed up to and including the limit test concentration of 100 mg/L (nominal concentration of filtered fraction after 3-d stirring).
In accordance with Figure IV.5 „Classification strategy for determining long-term aquatic hazard for metal compounds “of ECHA Guidance on the Application of the CLP Criteria (Version 5.0, July 2017) and section 4.1.2.10.2. of Regulation (EC) No 1272/2008, the substance zirconium praseodymium yellow zircon is poorly soluble and does not meet classification criteria for chronic (long-term) aquatic hazard.
In sum, the substance zirconium praseodymium yellow zircon is poorly soluble and does not meet classification criteria of Regulation (EC) No 1272/2008 for acute (short-term) and chronic (long-term) aquatic hazard.
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
