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EC number: 231-668-3 | CAS number: 7681-52-9
- 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

Endpoint summary
Administrative data
Description of key information
Additional information
Distribution
The following processes are involved in the distribution of hypochlorite in the environment.
• Fraction of substance in air associated with aerosol
• Partitioning between air and water
• Partitioning between solids and water in soil, sediment and suspended matter
Adsorption to aerosol particles
The fraction of substance associated with aerosol particles can be estimated on the basis of the vapour pressure of the substance
Fassaer = CONjunge x SURFaer / VP + CONjunge x SURFaer
Fassaer = fraction of the substance associated with aerosol particles
CONjunge = constant of Junge equation [Pa x m]
SURFaer = surface area of aerosol particles [m2 x m3] According to TGD as a default the product of CONjunge x SURFaer is set to10-4 Pa.
VP = Vapour pressure of hypochlorous acid [Pa] = 2500
This results in Fassaer = 4.0 x 10-7.
Thus, most atmospheric hypochlorous acid is not associated with atmospheric aerosols.
Volatilisation from water
At environmental pH values (6.5-8.5) half of the hypochlorite is in the undissociated form of hypochlorous acid and half is dissociated to the hypochlorite anion. Only the hypochlorous acid fraction is volatile. The measured Henry’s Law constant for hypochlorous acid of 0.097 Pa m³ mol-1 indicates that volatilisation from surface water is not expected to be an important process.
Adsorption onto / desorption from soils
As hypochlorite is a very strong oxidising substance, an adsorption/desorption test is technically not feasible. Hypochlorite would react with organic substance present in the test system and degrades to chloride within minutes. The adsorption coefficient Koc can only be calculated applying QSAR:
An hypothetical Koc can be calculated from Kow through different linear regression equations reported un Guidance (R.7.1.15.3). It can also be calculated by KOCWIN that delivers 2 figures
- using Molecular Connectivity Indices: log Koc = 1.12 (Koc = 13.22 L/kg)
- using regression equation: logKoc = 0.8679 logKow - 0.0004 = -2.9686 (Koc = 0.001075 L/kg)
Hypochlorite as an inorganic substance with an infinite water solubility and very low partitioning coefficients should be considered to be mobile in soil and sediment.Summary of environmental distribution
The adsorption of hypochlorous acid to aerosol particles, the volatilisation from water into air and the adsorption of hypochlorite onto soil are very low. Thus, hypochlorite remains in the aqueous phase where it degrades very rapidly to chloride.
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