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Diss Factsheets
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EC number: 237-057-8 | CAS number: 13597-65-4
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Hazard for air
Hazard for terrestrial organisms
Hazard for predators
Additional information
Conclusion on classification
The standard approach for classifying poorly soluble metals is to use the data generated from T/D tests, and compare this with relevant acute or chronic Ecotoxicity Reference Values (ERV) for the soluble metal compounds (Guidance on the application of the CLP criteria, ECHA, 2017).
Acute or chronic Ecotoxicity Reference Values (ERV) for zinc were derived in the zinc oxide dossier based on a large dataset and these were used as reference values for classification of zinc silicate.
A significant number of short-term aquatic data on zinc are available at both low (6 -<7) and neutral/high (7 -8.5) pH and low/medium (<100mg CaCO3/l) and medium/high (>100 mg CaCO3/l water hardness. At low pH (6-<7), values of 0.413 mg Zn/L (low pH, low hardness) and of >0.530 mg Zn/L (low pH, high hardness) were determined for Ceriodaphnia dubia. The lowest value of 0.413 mg Zn/L observed for Ceriodaphnia dubia was used for the classification at low pH. At neutral/ high pH, the lowest IC50 value of 0.137 mg/L was determined for freshwater algae (Selenastrum capricornutum) and this value was taken as reference value for classification for acute effects at neutral/high pH in the zinc oxide dossier.
In the zinc oxide dossier, the reference values for chronic aquatic toxicity for zinc were determined from the extensive chronic ecotoxicity data available for algae, invertebrates and fish at pH 6 and pH 8. The standard species NOEC values for each taxonomic group for which a bioavailability model is available were taken, and the lowest of the 3 was selected as a reference value at pH 6 and pH 8.
The following reference values for chronic zinc aquatic toxicity were derived in the zinc oxide dossier:
-at pH 6: 0.082 mg Zn/l (Daphnia magna)
-at pH 8: 0.019 mg Zn/l (Pseudokircherniella subcapitata)
The T/D tests with zinc silicate have revealed that zinc is released in test medium at pH 6 to a larger degree than at pH 8, therefore the results at pH 6 are taken into consideration for classification purposes as a worst-case scenario. At pH 6, 0.145 mg/L and 0.162 mg/L of zinc was released after 7 and 28 days, respectively, in the T/D study (Martinez, 2016a). The acute ERV of 0.413 mg Zn/L and chronic ERV of 0.082 mg Zn/L derived at low pH (pH 6 – 7) in the zinc oxide dossier are considered relevant for classification of zinc silicate. Based on comparison of zinc solubility determined in the T/D study with relevant ERV values, zinc silicate is not assigned an acute classification, as the concentration of dissolved zinc released after 7 days in the TD test is lower than the acute ERV. Zinc silicate is classified as Aquatic Chronic 1 since the dissolved zinc concentration released after 28 days in the T/D test at a loading rate of 1 mg/L is greater than the chronic ERV value derived for soluble zinc.
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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