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EC number: 200-822-1 | CAS number: 74-93-1
- 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
Key value for chemical safety assessment
Additional information
A number of studies have examined the photodegradation of methanethiol. In reaction with OH radicals,the rate constant for reaction of methanethiol with hydroxyl radicals at room temperature was 2.56 x 10-11cm3/(molecule•sec) with 50% degradation after 46 minutes. The atmospheric lifetime was calculated to range from 66 minutes to 35 hours in this study (Lee and Tang, 1983). An estimated half life of 3.8 hours (also based on reaction with OH radicals) and overall hydroxyl rate constant of 3.3 x 10-11cm3/(molecule•sec) was derived from the EPISuite model (U.S. EPA, 2000). In a study measuring photooxidation of methanethiol with alkyl nitrites as the source of OH radicals, the main products of the reaction were SO2, CH3SO3H and H2SO4, with the final yields of 29, 40 and ≥ 2%, respectively. Degradation was 100% after 4 minutes (Hatakeyama and Akimoto, 1983). In a reaction with NOx, the half life of methanethiol was 2 hours with 85% degraded after 5 hours (Sickleset al.,1978).
Sulfur dioxide is oxidized rapidly by both homogeneous and heterogeneous reactions and is removed from the atmosphere by precipitation and by dry deposition on surfaces, mainly as sulfuric acid (ATSDR, 1998). The acidic photo-oxidation products of methanethiol could contribute to the acidification of the aquatic environment.
Upon reaction with OH radicals, the half life of sodium methanethiolate was estimated to be 10 days using the EPISuite model (U.S. EPA, 2000). The estimated overall hydroxyl rate constant was 1.1 x 10-12cm3/(molecule•sec).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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