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Diss Factsheets
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EC number: 200-821-6 | CAS number: 74-90-8
- 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
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Distribution modelling
Administrative data
- Endpoint:
- distribution modelling
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: modelled from a validated (Q)SAR model.
- Justification for type of information:
- QSAR prediction: migrated from IUCLID 5.6
Data source
Reference
- Reference Type:
- other:
- Title:
- Unnamed
- Year:
- 2 004
Materials and methods
- Model:
- calculation according to Mackay, Level III
- Calculation programme:
- Equilibrium Calculation (EQC), version 2.02
- Release year:
- 2 003
- Media:
- air - biota - sediment(s) - soil - water
Test material
- Reference substance name:
- Hydrogen cyanide
- EC Number:
- 200-821-6
- EC Name:
- Hydrogen cyanide
- Cas Number:
- 74-90-8
- Molecular formula:
- CHN
- IUPAC Name:
- hydrogen cyanide
- Details on test material:
- modeled as 100% pure
Constituent 1
Results and discussion
Percent distribution in media
- Air (%):
- 91.31
- Water (%):
- 7.97
- Soil (%):
- 0.71
- Sediment (%):
- 0.01
Any other information on results incl. tables
The results show that cyanide discharged into surface water will remain mainly in the water compartment at compartmental transfer equilibrium and the partition equilibrium will never be achieved. Likewise, cyanide discharged into air will stay in air.
In a 1994 HazChem model (ECETOC, 1994), a more realistic global model was used, in which water accounts for 70% and soil accounts for 30% (earth's surface area), the air compartment was scaled up to 5000 m and depth of water to 200 m, while advection of water and air was set to zero. These dimensions showed an overall residence time in air of 2,310 hours (3.3 months). The release rate of HCN required to achieve a steady-state level in air of 0.2639 microgram/m3 (243 ppt) of HCN in this real world required an annual input of 3.1 Mtonnes HCN.
Applicant's summary and conclusion
- Conclusions:
- Cyanide in air will remain in air (91.31%); cyanide in water will remain in water (92%). A small amount of cyanide will adsorb to soil and will preferentially (10-fold) move to the air compartment over water. The small amount of cyanide which will adsorb to sediment will preferentially (10-fold) move to the water compartment over air. The half life in air is predicted to 357 day; in water, 15 days; in sediment, 60 days. A more relevant model predicts a half life in air of 3.3 months.
- Executive summary:
A Mackay Level III model was applied to hydrogen cyanide to predict distribution in air/water/soil/sediment compartments. Cyanide in surface water is predicted to remain mainly in the water compartment at compartmental transfer equilibrium, while the cyanide in air will remain in air. The partition equilibrium will never be achieved. The half-life in air is predicted to be approximately a year (357 days); in water and soil: 15 days; and in sediment: 60 days. A more global model predicts a residence time of 3.3 months in air.. The release rate of HCN required to achieve a steady state level in air of 0.2639 micrograms/m3 (243 ppt) of HCN in this model required an annual input of 3.1 metric tonnes of HCN.
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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