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EC number: 215-686-9 | CAS number: 1344-08-7
- 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
Stability
Polysulfides in aqueous solutions will practically always be deprotonated. At neutral and slightly alkaline conditions, S62-, S52-, and S42- dominate. These polysulfides are unstable especially under acidic conditions because polysulfides dissolved in water disproportionate as for instance according to the following reaction; Sn2- + H+--> Sn-1+ HS-. The rates of polysulfide oxidation are high compared to the oxidation rates of sulfide. The half-life of sulfide under oxic condions is considered to be in the order of a few hours to days.
Biodegradation
A valid ready biodegradability test result for polysulfides is not available because this substance is inorganic. Nevertheless all aspects important for achieving a ready biodegradability test result i.e. 1) ultimate (complete) biodegradation, 2) high rates of degradation and 3) occurrence of competent microorganisms in unacclimated ecosystems are fulfilled. Ready biodegradability tests only detect growth-linked biodegradation. Microorganisms are capable of growth on polysulfides under aerobic conditions (formation of sulfate (completely oxidized)) and anaerobic conditions in the presence of a reducing agent (formation of hydrogen sulfide (completely reduced)). Maximum growth rates of > = 0.8h-1are sufficiently high to enable a ready biodegradability test result. Transformation of reduced sulfur compounds has been detected in soils, fresh water, marine ecosystems and biological wastewater treatment plants. These findings demonstrate the wide distribution of polysulfide transforming microorganisms. Polysulfides should therefore be classified as readily biodegradable.
Table Summary of degradation rate constants in various (eco)systems based on the ready biodegradability of polysulfides using TGD default values.
(Eco)system |
Method |
Result |
Comment |
Surface water (fresh) |
TGD default value |
Half live 15 days |
Classification: readily biodegradable |
Surface water (fresh) |
Growth rate of sulfide oxidixing miroorganisms |
Half live 1 hour |
Result of publication in peer reviewed journal |
Aerobic sediment layer |
TGD default value |
Half live 30 days |
Kpsed 1.7 l/kg default of non hydrophobic |
Anaerobic bulk sediment |
TGD default value |
Half live 30 days |
Kpsed 1.7 l/kg default of non hydrophobic |
Marine water |
TGD default value |
Half live 50 days |
Classification: readily biodegradable |
Marine water sediment |
TGD default value |
Half live 100 days |
Kpsed 1.7 l/kg default of non hydrophobic |
Soils |
TGD default value |
Half live 30 days |
Kpsoil 0.7 l/kg default of non hydrophobic |
Degradation in sewage treatment plants |
Determined with bioreactor |
>99% |
Results of publications in peer reviewed journal (Vaiopoulou et al, 2005) |
Bioaccumulation
Na2Sx will disassociate and react almost instantly when entering the environment (see chapter 5) to SO4 and therefore is considered a harmless substance that does not have bioaccumulation potential.
Transport and distribution
Na2Sx will disassociate and react almost instantly when entering the environment (see chapter 5) to SO4 and therefore a harmless natural substance.
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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