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EC number: 204-984-4 | CAS number: 130-26-7
- 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
Appearance/physical state/colour
On the basis of physical observation and using the sense of smell, clioquinol was found to be a pale yellow organic amorphous solid with no odour at 24°C and 990 hPa.
Melting point/freezing point
No. of studies reviewed for Melting point endpoint from reliable sources having Klimish rating 2 and 4.
The summary of the results are presented below
Sr. no. |
Endpoint name |
values |
units |
Source |
1. |
Melting point |
178-179 |
degC |
CRC Handbook of Chemistry and Physics |
2. |
Melting point |
181 |
degC |
Journal of Organic Chemistry |
3. |
Melting point |
179-180 |
degC |
Pakistan Journal of Scientific and Industrial Research and Pharmaceutical Central Hall |
Based on the various weight of evidence studies the melting point of the test substance clioquinol varies between 178 to 181 degC.
Boiling point
Boiling point of clioquinol was estimated to be 365.31°C by means of adaptated stein and brown method.
Density
The bulk density of clioquinol by the mass by volume method was found to be 1.882 g/cm3 at room temperature of 24°C .This value when converted at 20 degC is equivalent to 1.5683.
Particle size distribution (Granulometry)
The particle size distribution (granulometry) of clioquinol by the sieve analysis method was found to be in the range of 75 micrometer to 500 micrometer. Majority of the particles were found to be in the size more than 150 (40.36%) - 500 (20.25%) micrometer in size.
Vapour pressure
Vapour pressure of clioquinol was estimated to be 0.0000479 Pa at 25 deg C by means of modified grain method. The Supporting study shows value different from key study which could be due to difference in the estimation conditions. However for the purpose of chemical safety assessment key study value shall be considered.
Partition coefficient
The experimental value of octanol water partition co-efficient (log Pow) of clioquinol is 1.5233 at 24 degC and pH of 4.7.This value indicates that clioquinol is relatively hydrophobic in nature.
Water solubility
The experimental value of the water solubility of clioquinol was found to be 4600 mg/L at 24 degC indicating that it is soluble in water.
Solubility in organic solvents / fat solubility
Gravimetric method was used to determine the solubility of the substance in organic solvent. The experimental value of solubility of clioquinol in methanol at 24 degC was found to be 1400 mg/L indicating that the substance is soluble in methanol.Using the Soxhlet/Solvent extraction method the solubility of the substance in Petroleum ether is observed to be 2000 mg/L at 24 °C, indicating that the substance is soluble in petroleum ether. The solubility value of clioquinol in petroleum ether at 20 degC is equivalent to a value of 1666.66 mg/L.
Surface tension
In accordance with Column 2 adaptation statement of REACH Annex VII, information requirement 7.6, this end point was considered for waiver since surface activity was not a desired property of clioquinol.
Flash point
In accordance with Section 2 of REACH Annex XI, information requirement section 7.9, this study does not need to be conducted based on the physical state of the molecule. According to ECHA guidance, flash point is only relevant to liquids.Therefore this study was considered for waiver.
Auto flammability
Clioquinol did not catch fire on being exposed to air at room temperature of 24 degC and atmospheric pressure of 990 hPa. This indicates that Clioquinol is not auto-flammable.
Flammability
From the experimental values of flammability, clioquinol ignited when the flame of bunsen burner having temperature of 950 degC was brought in contact with it. Thus it can be concluded that clioquinol is flammable only at high temperature of about 950 degC. However since such high temperatures are not found under normal circumstances of transportation and use, clioquinol was considered non-flammable for chemical safety assessment.
Explosiveness
According to theoretical considerations based on chemical structure, clioquinol does not possess explosive properties. The reason for this is there are no chemical groups associated with explosive properties in clioquinol Thus, as per column 2 of Annex VII this end point was considered for waiver.
Oxidising properties
Clioquinol was found to have mild oxidising property since 334.0 ml of KMnO4 was required for getting the end point of the redox titration for 100 g of clioquinol. Thus, the chemical is considered as non-oxidising for the purpose of classification.
Stability in organic solvents and identity of relevant degradation products
Clioquinol was found to be stable in organic solvent dichloro methane and no degradation products were formed after 24 hours as evident from the GC-MS chromatogram obtained at 0 hours and that obtained after 24 hours.
pH
1% by volume solution of clioquinol was found to exhibit a pH of 3.42 at 21 degC. Thus 1% by volume solution of clioquinol is acidic in nature.
Dissociation constant
The experimental pKa value for clioquinol was found to be 0.0000045133333333 (average pKa value) at 24 degC indicating that it has dissociation properties. This value at 20 deg C is equivalent to 0.000003761111111083.
Viscosity
This end point was considered for waiver since viscosity is an inherent property of a liquid that offers resistance to its flow and clioquinol is a solid substance and hence this testing was considered scientifically unjustified for clioquinol.
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