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EC number: 231-749-3 | CAS number: 7719-12-2
- 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)
Description of key information
The substance rapidly breaks down on contact with water to form hydrochloric and phosphorus acid. Phosphorus acid decomposes in air when heated yielding phosphoric acid.
Key value for chemical safety assessment
Additional information
The hydrolysis of phosphorus trichloride has been extensively investigated. Early work conducted on the area showed that on reaction of phosphorus trichloride in water, hydrochloric acid and phosphonic acid were formed.
Further studies by Mitchell (1925) suggested that there were intermediate stages of hydrolysis. About 98% of the final acidity was attained within 1 minute. The remainder was developed with decreasing rapidly during the next 30 minutes. An intermediate formation of an oxychloride such as P(OH)2Cl would account for this observation. However, also observed was an enhanced reducing power which was further investigated. However, this can not be attributed to the intermediate oxychloride and it is suggested that a second form, P(OH)3 was formed at this point which does not immediately change to the oridinary form, HPO(OH)2.
As phosphorus acid and phosphonic acid are tautomeric molecules. Tautomerisation occured to give the predominant form, phosphonic acid (HPO(OH)2).A second product formed from the hydrolysis of phosphorus trichloride is hydrochloric acid which formed in the ratio of 3:1 with regard to phosphonic acid. It is a much stronger acid than phosphonic acid (pKa -7.0 versus 2.0) so therefore all effects on pH shift are mainly caused by HCl. The environmental effects of the hydrolysis products are also mainly due to the formation of hydrochloric acid.
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