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EC number: 228-601-5 | CAS number: 6303-21-5
- 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
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
One key study is available for the sodium phosphinate salt by read across. Independent of the soil characteristics, phosphinate adsorption was low, with Kd and Koc values ranging from 0.11-0.3 mL/g and 3.7-15 mL/g, respectively. The highest value of Koc equal to 15 mL/g corresponding to the strongest adsorption observed and measured in an acidic slit loam soil with a pH of 5.3 was retained as key value for assessment.
Based on these results, the potential of adsorption/desorption of phosphinic acid is low and therefore no further information according to Annex IX is not necessary.
Key value for chemical safety assessment
- Koc at 20 °C:
- 15
Additional information
One key study is available on sodium phosphinate according to the OECD guideline 106 and under GLP compliance.
Phosphinic acid is commercially prepared as the result of pH adjustement of the sodium phosphinate. Both are highly soluble in water and release the phosphinate anion. The phosphinate anion is expected to play the most significant role for determining toxicity hence at comparable concentration and defined pH, the adsorption/desorption potential of the phosphinic acid hydrolysis can be read across from the sodium phosphinate salt.
Five soils were tested for this batch equilibrium method showing a range of textures and pHs [5.32; 7.47]. After two preliminary tests, the adsorption/desorption kinetics of the phosphinate anion was determined in the five soils after 24h, 48h and seven days of agitation using a soil-to-solution ratio of 1:1 and a phosphinate concentration of 10 µg/mL.
No consistent adsorption was seen for soil I at any time and for the other soils, a plateau was reached after 24-48 h, with no further increase for the seven day time point. After 48 hours of agitation, adsorption represented 24%, 13%, 10% and 14% for soils II to V, respectively. The Kd values amounted to 0.31, 0.15, 0.11 and 0.16 mL/g for soils II to V, respectively, with corresponding Koc values of 15, 11, 11 and 3.7 mL/g. The adsorption was strongest in soil II, an acidic slit loam with a pH of 5.3.
Due to the overall low adsorption of phosphinate, Freundlich isotherms were not determined. Desorption was investigated and could only be measured in soil II, where 24% of the adsorbed amount could be recovered after 48 h of desorption. Thus, adsorption was at least partially reversible in this soil.
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