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Diss Factsheets
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EC number: 237-224-5 | CAS number: 13701-64-9
- 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
Endpoint summary
Administrative data
Description of key information
In the environment the transformation/hydrolysis of boron compounds is complex and is dependent on environmental factors; however, under typical environmental conditions it is expected that boric acid will be the most common and dominant species in the aquatic environment, soil and sediment and it is also not expected to degrade further due to the high energy required to break the B – O bond (523 kJ/mol). Therefore, a read-across approach is considered appropriate to use the source substance, boric acid, rather than the target compound (calcium metaborate).
Stability - hydrolysis:
A review of the structure of the test item has indicated that it consists of infinite (polymeric) chains of B2O42- units plus the Ca2+ counterions, and therefore, will be extremely insoluble in water. Therefore, it has been concluded that any test item that appears to have dissolved in aqueous solutions will actually exist in the solutions as the fully hydrolysed (i.e., polymeric B2O42- chains into borate) and fully dissociated species, i.e. as separate calcium cations and borate (boric acid) anions, depending on the pH of the aqueous solution. Based on the dissociation constant of boric acid, i.e. 9.14 it can be concluded that hydrolysis and therefore apparent solubility of the test item at pH 9 will be slow and minimised. Hydrolysis and apparent solubility at pH 7 will be fairly rapid. Hydrolysis and apparent solubility at pH 4 will be very rapid and maximised. Based on the extreme insolubility of the (parent) test item in water and the hydrolysis issues discussed above, it was concluded that hydrolysis testing of the (parent) test item was not feasible.
Biodegradation - biodegradation in water:
The ready biodegradability of the test item in water does not need to be conducted because the substance is inorganic.
Transport and distribution - adsorption / desorption:
Based on adsorption-desorption studies in soil, freshwater and marine sediments the adsorption of the source substance, boric acid, to soil and sediment is expected to be low.
Additional information
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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