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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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

Reliable proprietary studies are not available for Zirconium zircon with encapsulated hematite. The poorly soluble substance Zirconium zircon with encapsulated hematite 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 respective lowest acute and chronic ecotoxicity reference values (ERVs) as determined for the (soluble) metal ions.


 


The acute ERVs are based on the lowest EC50/LC50 values for algae, invertebrates and fish and were obtained from the Metals classification tool (MeClas) database as follows: An acute ERV for silicon has not been derived since a concern for short-term (acute) toxicity of silicon ions was not identified (see also OECD, 2004). The acute ERVs for iron (> 100 mg Fe/L) and zirconium (74 mg Zr/L) are above 1 mg/L and thus a concern for short-term (acute) toxicity was not identified (no classification). 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.” Due to the lack of an acute aquatic hazard potential for iron, silicon and zirconium ions and the fact that dissolved iron and zirconium concentrations remained below the LOD after 7 days at pH 8 and a loading of 1 mg/L in the T/D test, it can be concluded that the substance Zirconium zircon with encapsulated hematite is not sufficiently soluble to cause short-term toxicity at the level of the acute ERVs (expressed as EC50/LC50).


 


A supporting study (Munk, 1992) of the acute toxicity of the dispersed pigment Zirconium zircon with encapsulated hematite to zebra fish (Brachydanio rerio) supports this conclusion since mortality or any other signs of toxic effects were not observed at the limit test concentration of 10,000 mg/L (nominal total concentration).


 


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 zircon with encapsulated hematite is poorly soluble and does not meet classification criteria for acute (short-term) aquatic hazard.


 


Regarding the long-term toxicity, the chronic ERVs are based on the lowest NOEC/EC10 values for algae, invertebrates and fish and were obtained from the Metals classification tool (MeClas) database as follows: A chronic ERV for silicon has not been derived since a concern for long-term (chronic) toxicity of silicon ions was not identified (see also OECD, 2004). A chronic ERV has also not been derived for zirconium. For iron ions, the chronic ERV is above 1 mg/L and a concern for long-term (chronic) toxicity was not identified (no classification). According to ECHA Guidance on the Application of the CLP Criteria (Version 5.0, July 2017), ”Where the chronic ERV for the metal ions of concern corrected for the molecular weight of the compound (further called as chronic ERV compound) is greater than 1 mg/L, the metal compounds need not to be considered further in the classification scheme for long-term hazard.” Due to the lack of a chronic aquatic hazard potential for iron, silicon and zirconium ions and the fact that dissolved iron and zirconium concentrations were below the LOD of 0.5 µg/L after 28 days at pH 8 in the T/D test, it can be concluded that the substance Zirconium zircon with encapsulated hematite is not sufficiently soluble to cause long-term toxicity at the level of the chronic ERVs (expressed as NOEC/EC10).


 


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 zircon with encapsulated hematite is poorly soluble and does not meet classification criteria for chronic (long-term) aquatic hazard.


 


In sum, the substance Zirconium zircon with encapsulated hematite 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.