Zircon, cadmium yellow

GHS

General Information

Name:

Zirconium zircon with encapsulated cadmium sulphide

Not classified

Remarks:

Conclusion on environmental classification

The poorly soluble substance Zirconium zircon with encapsulated cadmium sulphide is evaluated by comparing the dissolved metal ion levels resulting from the transformation/dissolution test after 7 and 28 days 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. The acute and chronic ERVs are based on the lowest EC50/LC50 and NOEC/EC10 values for algae, invertebrates, and fish, respectively. Acute and chronic ERVs were obtained from the Metals Classification tool (MeClas) database as follows: The acute ERV for cadmium is 18 µg Cd/L, and thus well above the dissolved cadmium concentrations of 0.0798 µg Cd/L at pH 6 and 0.1134 µg Cd/L at pH 8, determined after 7 days T/D tests at a loading of 1 mg/L. Acute ERVs for silicon and sulphur have not been derived since a concern for short-term (acute) toxicity of silicon and sulphur ions was not identified, as also specified for silicon in the OECD SIDS for silicon dioxide (OECD, 2004). The acute ERV for zirconium (74 mg Zr/L) is above 1 mg/L and thus a concern for short-term (acute) toxicity was not identified (no classification).

Due to the lack of an acute aquatic hazard potential for soluble silicon and sulphur ions, the fact that dissolved cadmium and zirconium concentrations after 7 days T/D tests at a loading of 1 mg/L and pH 6 and 8 were significantly lower than the lowest acute ERV for cadmium and zirconium, respectively, and the fact that the summation of the toxic units of the different metals at the loading rate (1 mg/L) is lower than one (Σ TU < 1), it can be concluded that the substance Zirconium zircon with encapsulated cadmium sulphide is not sufficiently soluble to cause short-term toxicity at the level of the acute ERVs (expressed as EC50/LC50).

Regarding the long-term toxicity, the chronic ERV for cadmium is 0.21 μg Cd/L (EC 2007) and thus above the dissolved cadmium concentrations of < 0.0048 µg Cd/L at pH 6 and 0.1966 µg Cd/L at pH 8, determined after 28 days T/D tests at a loading of 1 mg/L. Chronic ERVs for silicon, sulphur and zirconium have not been derived since a concern for long-term (chronic) toxicity of silicon, sulphur and zirconium ions was also not identified. Due to the lack of a chronic aquatic hazard potential for silicon, sulphur and zirconium ions and the fact that dissolved cadmium concentrations after 28 days T/D tests at a loading of 1 mg/L and pH 6 and 8 were below the lowest chronic ERV for cadmium, it can be concluded that the substance Zirconium zircon with encapsulated cadmium sulphide 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.4 “Classification strategy for determining acute aquatic hazard for metal compounds” and 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 cadmium sulphide is poorly soluble and does not meet classification criteria for acute (short-term) and chronic (long-term) aquatic hazard.

In sum, the substance Zirconium zircon with encapsulated cadmium sulphide 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.

 

Please find attached in IUCLID section 2.1 the documentation of the aquatic hazard classification for Zirconium zircon with encapsulated cadmium sulphide derived with the Metals Classification tool (MeClas) Version 5.10 (“EBRC_Aquatic hazard classification conclusions for Zirconium zircon with encapsulated cadmium sulphide_2022-03-14”).

Classification

Physical hazards

Explosives

Reason for no classification:

data conclusive but not sufficient for classification

Flammable gases and chemically unstable gases

Reason for no classification:

hazard class not applicable

Aerosols

Reason for no classification:

hazard class not applicable

Reason for no classification:

hazard class not applicable

Oxidising gases

Reason for no classification:

hazard class not applicable

Gases under pressure

Reason for no classification:

hazard class not applicable

Flammable liquids

Reason for no classification:

hazard class not applicable

Flammable solids

Reason for no classification:

data conclusive but not sufficient for classification

Self-reactive substances and mixtures

Reason for no classification:

data conclusive but not sufficient for classification

Pyrophoric liquids

Reason for no classification:

hazard class not applicable

Pyrophoric solids

Reason for no classification:

data conclusive but not sufficient for classification

Self-heating substances and mixtures

Reason for no classification:

data conclusive but not sufficient for classification

Substances and mixtures which in contact with water emit flammable gases

Reason for no classification:

data conclusive but not sufficient for classification

Oxidising liquids

Reason for no classification:

hazard class not applicable

Oxidising solids

Reason for no classification:

data conclusive but not sufficient for classification

Organic peroxides

Reason for no classification:

hazard class not applicable

Corrosive to metals

Reason for no classification:

hazard class not assessed

Desensitized explosives

Reason for no classification:

hazard class not applicable

Health hazards

Acute toxicity - oral

Reason for no classification:

data conclusive but not sufficient for classification

Acute toxicity - dermal

Reason for no classification:

data lacking

Acute toxicity - inhalation

Reason for no classification:

data lacking

Skin corrosion / irritation

Reason for no classification:

data conclusive but not sufficient for classification

Serious eye damage / eye irritation

Reason for no classification:

data conclusive but not sufficient for classification

Respiratory sensitisation

Reason for no classification:

data conclusive but not sufficient for classification

Skin sensitisation

Reason for no classification:

data conclusive but not sufficient for classification

Aspiration hazard

Reason for no classification:

data conclusive but not sufficient for classification

Reproductive toxicity

Reason for no classification:

data lacking

Effects on or via lactation

Reason for no classification:

data lacking

Germ cell mutagenicity

Reason for no classification:

data conclusive but not sufficient for classification

Carcinogenicity

Reason for no classification:

data lacking

1. Specific target organ toxicity - single (STOT-SE)

Reason for no classification:

data conclusive but not sufficient for classification

1. Specific target organ toxicity - repeated (STOT-RE)

Reason for no classification:

data lacking

Environmental hazards

Hazardous to the aquatic environment (acute / short-term)

Reason for no classification:

data conclusive but not sufficient for classification

Hazardous to the aquatic environment (long-term)

Reason for no classification:

data conclusive but not sufficient for classification

Hazardous to the ozone layer

Reason for no classification:

data conclusive but not sufficient for classification

Labelling

Signal word:

No signal word