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Diss Factsheets
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EC number: 231-674-6 | CAS number: 7681-65-4
- 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
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
After evaporation iodine will be rapidly degraded either by photolysis or reaction with free atmospheric radicals (e.g. ozone, OH etc.) and enter into the natural geochemical cycle of iodine.
Key value for chemical safety assessment
- Half-life in air:
- 0.14 min
- Degradation rate constant with OH radicals:
- 0 cm³ molecule-1 d-1
Additional information
Saiz-Lopez determined the absolute cross-section as well as the photolysis rate of iodine in the gas phase in a laboratory set-up.
Quintuplicate experiments at five different irradiances in order to analyse the variation of the photolysis rate with the light intensity were performed. The mean photo-dissociation rate constant for an irradiance of 1350 Wm-2(1 solar constant) was determined with J(I2)= 0.14±0.04 s-1and a linear fit with a slope of (1.10±0.07) x 10 -4 s-1W-1m2could be observed. The findings of the study are in good agreement to estimations of an existing computational model on solar irradiance and photo-dissociation rates.
Since the study was conducted in accordance with generally accepted scientific principles, is well documented and the absence of a standard test guideline for photolysis in air, this study is considered to be reliable and adequate for the environmental risk assessment.
The presented degradation rate constants for the reactions of iodine with hydroxyl radicals and ozone support the very short lifetime of iodine (DeMore, 1997). As these peer-reviewed data are used for atmospheric modelling they can also be considered as reliable for the assessment of the atmospheric fate of iodine.
Based on the natural occurrence of iodine in all environmental compartments and the rapid degradation of gaseous iodine by photolysis and reaction with free radicals in the atmosphere it can be assumed that iodine does not play a relevant role in the destruction of the stratospheric ozone layer. Thus, it is not classified as hazardous to the ozone layer.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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