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Diss Factsheets
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EC number: 206-992-3 | CAS number: 420-04-2
- 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)
- Endpoint:
- phototransformation in air
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- key study
- Study period:
- 2003
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with generally accepted scientific standards and described in sufficient detail
- Qualifier:
- no guideline required
- Principles of method if other than guideline:
- For details on method see below (model calculation)
- GLP compliance:
- no
- Remarks:
- study is a model calculation.
- Estimation method (if used):
- The photo-chemically and oxidative decomposition of cyanamide in air was evaluated based on a theoretical calculation according to Atkinson.
The calculation was performed with the help of the programme AOPWIN, Atmospheric Oxidation Programme v1.90 for Microsoft Windows 3.1, Windows 95/98, Windows NT (© 2000 US Environmental Agency). - Light source:
- other: not applicable
- Details on light source:
- Not applicable
- Details on test conditions:
- Not applicable
- Reference substance:
- no
- Preliminary study:
- Not applicable
- Test performance:
- Not applicable
- Results with reference substance:
- Not applicable
- Validity criteria fulfilled:
- not applicable
- Conclusions:
- Cyanamide was estimated to be stable in the atmosphere. Cyanamide is not supposed to react with hydroxyl radicals and ozone.
- Executive summary:
An estimation of the photochemical degradation of cyanamide was performed using the Atkinson calculation method. The reaction rates with the amino group of cyanamide (OH radical interaction with N containing groups) have a value of k = 0.0000 × 10-12 cm3 molecule-1 sec-1. That means, that for cyanamide the OH radicals do not react with the N containing groups and therefore, the overall rate constant was estimated to be 0.0 cm3 molecule-1 sec-1.
It can therefore be concluded that cyanamide is stable in the atmosphere. It is, however, questionable whether the Atkinson calculation allows for an adequate estimation of the photochemical degradation of cyanamide. It has to be considered that cyanamide is a substance that is chemically far away from typical organic molecules like phenols or halogen-hydrocarbons, for which the model seems to be better suited.
Reference
Model results: The total OH radical reaction rate constant (kOH) is given by: kOH = k (H-atom abstraction from C-H and O-H bonds) + k (OH radical addition to CC double and triple bonds) + k (OH radical addition to aromatic rings) + k (OH radical interaction with N-, S- and OH-containing groups) For cyanamide it is: kOH = k (OH radical interaction with N bonds) The reaction rates with the amino group of cyanamide (OH radical interaction with N containing groups) have a value of k = 0.0000 × 10-12 cm3 molecule-1 sec-1. That means, that for cyanamide the OH radicals do not react with the N containing groups and therefore, the overall rate constant was estimated to be 0.0 cm3 molecule-1 sec-1.
Description of key information
Release of cyanamide to the air from water and moist soil surfaces is rather limited as experimental results imply that cyanamide fast degradation in soil and surface water is likely to limit volatilisation after application as well as its high solubility in water. Nevertheless a calculation according to Atkinson as an estimation method for photolysis of cyanamide in air was conducted and concluded that cyanamide is stable in the atmosphere.
Key value for chemical safety assessment
Additional information
For evaluation of the photolysis in air, an estimation method was used which is a calculation according to Atkinson (Peter, 2003, Doc. No., 743-003). According to Atkinson calculation the overall rate constant was estimated to be 0.0 cm³ molecule-1sec-1 . It was therefore concluded that cyanamide is stable in the atmosphere. It is, however, questionable whether the Atkinson calculation allows for an adequate estimation of the photochemical degradation of cyanamide. It has to be considered that cyanamide is a substance which is chemically far away from typical organic molecules like phenols or halogen-hydrocarbons, for which the model seems to be better suited.
Few experimental results add more information on cyanamid´s fate and behaviour in air: Although cyanamide has a vapour pressure of 0.51 Pa at 20 °C which is an indicator of the volatilisation potential of cyanamide, the Henry’s law constant calculated as 2.68 × 10-5 Pa m3 mol-1 indicates that the high water solubility of cyanamide is likely to counteract the tendency of cyanamide to volatise from water and moist soil surfaces.
Furthermore, cyanamide is rapidly degraded in the environment with a realistic “worst case” DT50field value in soil of 1.6 days and in surface water with 4.3 days. The photolytical half-life of cyanamide on soil surfaces is even shorter with 1.45 days. Therefore, it can be assumed that the fast degradation of cyanamide in soil and surface water is likely to limit volatilisation after application.
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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