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EC number: 292-605-3 | CAS number: 90640-84-9 A complex combination of hydrocarbons produced by the distillation of coal tar and boiling in the range of approximately 240°C to 280°C (464°F to 536°F). Composed primarily of acenaphthene, naphthalene and alkyl naphthalene.
- 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
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The range for Koc of key components in wash oil is estimated to be between 1300 and 10300 (log Koc between approx. 3.1 and 4) at 20°C. Log Koc for wash oil is calculated as mean of the six major components (typical concentration above 5 %). This mean value (log Koc = 3.632) relates to a Koc of 4280.
Key value for chemical safety assessment
- Koc at 20 °C:
- 4 280
Additional information
Adsorption Coefficient
Due to the complex composition of creosote oil, acenaphthene fraction (wash oil), a single Koc value cannot be determined for the substance. Main components (all PAH) will have their individual Koc values. An extract is presented in the following paragraphs.
Koc values of PAH have been estimated by calculations based on Pow/log Pow values using different relations between log Pow/Pow and log Koc/Koc. Well established is the equation by Karickhoff et al. (1979) derived from experimental data: log Koc = log Pow - 0.21 (or Koc = 0.63 Kow). Log Koc/Koc data reported for wash oil constituents will originate from this equation. Koc data derived using this equation have also been used in the EU Risk Assessment Report for Coal-tar pitch, high temperature (European Union 2008).
Overall properties of wash oil will best be represented by the range of log Koc/Koc values corresponding to the PAH present in wash oil (naphthalene to anthracene, see Chapter 1.). The estimated adsorption coefficients for these constituents extend from approx. log Koc ca. 3.1 for naphthalene to approx. 4.5 for anthracene (Koc range from ca. 1300 - 30000).
Substances with typical concentration above 5 % are naphthalene (11 – 13 % w/w), 1-methylnaphthalene (7 – 9 % w/w), 2 -methylnaphthalene (17 – 20 % w/w), biphenyl (5 – 6 % w/w), fluorene (4 – 5 % w/w), acenaphthene (13 – 15 % w/w). They amount to ca. 60 % of total wash oil. Their log Koc values range from 3.13 (naphthalene) to 4.01 (fluorene) (Koc = ca. 1300 to 10230).
Taking into account the log Koc values of these six substances, a mean log Koc value for wash oil can be calculated. Accordingly, the mean log Koc value is estimated to 3.632 for the six major components of wash oil. This value is very close to the Log Koc values of 1- and 2- methylnaphthalene, acenaphthene and biphenyl accounting for almost 50% of wash oil. Koc is calculated to 4280. This value is considered to represent best the properties of wash oil by a single Koc value as required for risk assessment.
Adsorption to Soil
Depending on their log Koc, adsorption of individual wash oil components to soil organic matter will differ: Mainly naphthalenes and other two-ring aromatic constituents will tend to be mobile and migrate into the water phase.
Adsorption to Air Particles
Based on vapour pressure, the majority of volatile wash oil components are expected in the gas phase rather than bound to air particulates.
[LogKoc: 3.632]
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