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EC number: 236-875-2 | CAS number: 13530-50-2
- 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
Hydrolysis
Administrative data
Link to relevant study record(s)
- Endpoint:
- hydrolysis
- Type of information:
- migrated information: read-across based on grouping of substances (category approach)
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Well documented non.guideline study
- Principles of method if other than guideline:
- The effect of pH on aluminium chloride hydrolysis was determined.
- GLP compliance:
- no
- Details on sampling:
- A test substance concentration of 1.5E-4 mol/L was prepared. The pH of the solution was adjusted to 4.0, 4.8, 5.0, 5.2, 5.8, and 6.4 respectively
- Buffers:
- - pH: 4.01 and 7.00
- Type of buffer: Tetramethylammmonium hydroxide pentahydrate and HCL solution - Transformation products:
- not specified
- Remarks:
- see "any other information on results"
- Remarks on result:
- not measured/tested
- Remarks on result:
- not measured/tested
Reference
When AlCl3 was diluted to a concentration of 1.5*E-4 mol/L hydrolysis occurred immediately At pH 4 mono- and dimeric aluminium species were detected as main products. With increasing pH the hydrolysis and polymerisation increased. Monomeric and dimeric aluminium species hydrolysed and polymerised into small polymeric aluminium species at pH 4.8. At pH 5 the small polymeric aluminium species polymerised into median polymeric species. At pH 5.8 metastable median and large polymers decomposed into small aluminium species and disaggregated into dimeric species. At pH 6.4 the majority of aluminium species formed Al(OH)3 amorphous flocks.
Description of key information
Key value for chemical safety assessment
Additional information
An experimental study on hydrolysis as a function of pH is not available for aluminium tris(dihydrogen phosphate) (CAS 13530-50-2) as the substance dissociates in aqueous solution. Aluminium undergoes hydrolysis forming various species strongly as a function of pH. The pH dependency of aluminium hydrolysis was investigated by Zhao et al. (2009). The hydrolysis of aluminium chloride was tested at pH values ranging from 4 - 6.4. When AlCl3 was diluted to a concentration of 1.5*E-4 mol/L hydrolysis occurred immediately. At pH 4 mono- and dimeric aluminium species were detected as main products. With increasing pH the hydrolysis and polymerisation increased. Monomeric and dimeric aluminium species hydrolysed and polymerised into small polymeric aluminium species at pH 4.8. At pH 5 the small polymeric aluminium species polymerised into median polymeric species. At pH 5.8 metastable median and large polymers decomposed into small aluminium species and disaggregated into dimeric species. At pH 6.4 the majority of aluminium species formed Al(OH)3 amorphous flocks.
Phosphoric acid is a weak acid that does not fully dissociate in water. Salts containing the anion H2PO4¯ are weakly acidic. When dihydrogen phosphate salt is dissolved in solution, equilibria are established among the four species H3PO4 (phosphoric acid itself), H2PO4-1 (dihydrogen phosphate anion), HPO4-2 (hydrogen phosphate anion), and PO4-3 (phosphate anion). The tendency of the H2PO4¯ ion to dissociate is greater than its tendency to hydrolyse to HPO4-2. Whereas the salts of HPO4-2 are weakly basic, and the tendency of this ion to hydrolyse is greater than its tendency to dissociate. Various phosphate ions maintain a dissociation equilibrium state and are present as dominant phosphorus species in water under the normal environmental conditions.
H3PO4 + H2O < --- > H2PO4¯ + H3O+ pK1 = 2.12
H2PO4¯ + H2O < --- > HPO4-2 + H3O+ pK2 = 7.21
HPO4-2 + H2O < --- > PO4-3 + H3O+ pK3 = 12.44
Further dissociation forming tertiary phosphates, such as orthophosphate, give a strongly alkaline solution with pH > 12. However, this is unlikely for aluminium tris(dihydrogen phosphate) under environment conditions. Monohydrogen and dihydrogen phosphates act as a buffer over a pH range of 6 – 8 and have an important biological function in the aquatic environment.
As ions monohydrogen and dihydrogen phosphates are well soluble in water. However, they can be incorporated into either biological solids (e.g. microorganisms) or chemical precipitates and thus are removed from water e.g. by the formation of insoluble aluminum hydroxide at a pH value between 6 and 8.
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