Registration Dossier
Registration Dossier
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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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
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EC number: 233-135-0 | CAS number: 10043-01-3
- 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
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Dissociation constant
Administrative data
- Endpoint:
- dissociation constant
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- the study does not need to be conducted because the substance is hydrolytically unstable (half-life less than 12 hours)
- the study does not need to be conducted because the substance has no ionic structure
- Justification for type of information:
- JUSTIFICATION FOR DATA WAIVING
In accordance with Section I of REACH Annex XI, the dissociation constant (required in Section 7.16) does not need to be measured as the registration substance itself does not have ionisable structural features.
The substance will totally dissociate into ions, and form different species, the pKa of the parent substance cannot be determined, and this study is not scientifically necessary:
Based on the basic knowledge of soluble aluminium slats, including aluminium sulphate, the form of the element in water varies from mononuclear to polynuclear hydroxo complex depending on the pH of solution:
Al3+→ [Al(OH) ]2+ → [Al(OH)2]+ → Al(OH)3(↓) → [Al(OH)4]- → [Al2O(OH)6]2-
pH < 4 → → → → → pH > 10
Due to physical-chemical properties (see section 4.8 water solubility), the substance dissolving in water results a strong acidic solution. Using the flask method , the water solubility of 202030/A at 20°C was ≥ 1000 g/l. The pH of the aqueous sample was 2.4. As a consequence in this aqueous solution, the Aluminium compound exists mainly as Aluminium ion and complexes of aluminium species [e. g. Al(OH)4-, the predominant species at higher pH], which are not expected to dissociate under naturally relevant pH (4-9) conditions.
In addition, in aqueous solution Al3+ does not occur as the free ion but is surrounded by six molecules of water to form (Al(H2O)6)3+. As pH increases, protons are removed from the co-ordinated waters to give various hydrolysis products. Progressive hydrolysis leads to the formation of aluminium hydroxide. Concentrated commercial products are stable over months and years. When applied AS hydrolyses within minutes to Al(OH)3.
Based on the study of hydrolysis of aluminium salts (see section 5.1.2 Hydrolysis), the process of polymeric aluminium species formation and decomposition was demonstrated.
Therefore the study of dissociation constant does not need to be conducted.
Data source
Materials and methods
Results and discussion
Applicant's summary and conclusion
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.
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