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EC number: 212-783-8 | CAS number: 868-85-9
- 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
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
DT50 = 470 h (pH 4, 23 °C)
DT50 = 3.09 h (pH 7, 23 °C)
DT50 < 1 min (pH 9, 23 °C)
Key value for chemical safety assessment
Additional information
A guideline study to investigate the stability of dimethyl phosphonate in water was conducted by the Bayer AG (2002). The study shows that dimethyl phosphonate is hydrolysed rapidly to moderately fast in water depending on the pH. The study is in accordance with the principles of Good Laboratory Practice (GLP) and was conducted according to the directive 92/69/EEC, method C.7 using 31-Phosphorous-NMR for analysis. Incubations were performed in buffered water at 23 °C. Dimethyl phosphonate is hydrolysed faster in basic solution than at lower pH. The dissipation half-life of dimethyl phosphonate was determined to be 470 h at pH 4, 3.09 h at pH 7 and less than 1 minute at pH 9. The primary degradation products at every pH value were monomethyl phosphonate and methanol (Bayer AG, 2002).
In a study on the stability of tri-, di- and monomethyl phosphonate in unbuffered water without control of pH, the hydrolytic loss of tri- and dimethyl phosphonate and the formation of monomethyl phosphonate were monitored. Half-life of dimethyl phosphonate was estimated to be 60 h. After 6 days 100% of dimethyl phosphonate was degraded. In the first phase of the incubation monomethyl phosphonate was the only detected hydrolysis product, but starting after 74 h of incubation, phosphonic acid was also detected. The stability of monomethyl phosphonate was investigated by continuing the analysis of the dimethyl phosphonate hydrolysis. After 6 days (100% degradation of dimethyl phosphonate) 85% of the initial dimethyl phosphonate was recovered as monomethyl phosphonate, another 15% was degraded supposably to phosphonic acid. After 10 days 68% monomethyl phosphonate were found and another 32% were supposed to be degraded to phosphonic acid. It was concluded that monomethyl phosphonate is hydrolysed more slowly than dimethyl phosphonate (Bayer AG, 1992).
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