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EC number: - | CAS number: -
- 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
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
The water solubility of the test material was determined to be less than 0.1 mg/L of solution at 20.0 ± 0.5 °C, using a short-term flask method based on Method A6 Water Solubility of Council Regulation (EC) No 440/2008 of 30 May 2008. Using a fragment constant methodology, the water solubility of the individual components of the test material were estimated to be less than 0.000000001 g/L.
Key value for chemical safety assessment
Additional information
Discussion:
Whereas the preliminary test short-term assessment test was a clear solution containing solid, excess un-dissolved test material when removed from the 20°C static water bath for analysis (and subsequently was demonstrated to contain less than 1 x l0-4 g/L of solution), the definitive test samples were observed to contain test material in a dispersion/suspension throughout the solution. The definitive test solutions were centrifuged prior to analysis and were seemingly clear at the time of analysis, however the final analytical results where significantly higher than anticipated. It was therefore believed that the definitive test solutions contained a degree of contamination in the form of a micro-emulsion at the time of analysis causing a systematic overestimation of the water solubility of the test material. Surface active properties were observed within the definitive test samples, and this was consistent with the proposed chemical structure for the test material, which contains distinct polar and non-polar regions. The negligible solubility of the test material was further supported by the high partition coefficient result and the validated computer estimation of water solubility, which resulted in values many magnitudes below that achievable analytically. Filtration of the solutions was not performed prior to analysis due to potential strippinglpartitioning of the extremely hydrophobic test material onto the filter membranes andlor filter bodies. Also based on the computer estimations of water solubility, even when using a significant co-solvent content, it may not be possible to prepare true solutions of test material at a concentration that could be monitored analytically. Therefore, it would be extremely difficult to distinguish between mechanical and adsorptive processes if a significant reduction in test material concentration was obtained for filtered procedural recoveries. Finally, in cases of colloidal (<0.2 µm ) emulsions, filtration once more may fail to completely remove all excess, undissolved test material suspended in the solutions. The preliminary water solubility test indicated that the column elution method should have been performed as the solubility was less than 1 x 10-2 g/L. However, due to the physical nature of the test material, it was not possible to use this method; experience has shown that soft, waxy test materials coated onto glass beads cause these beads to compact andlor adhere together, forming a plug within the column and thus preventing water circulation.
Conclusion
The water solubility of the test material was determined to be less than 1.0 x l0-4 g/L of solution at 20.0 ± 0.5 °C, using a short-term flask method based on Method A6 Water Solubility of Council Regulation (EC) No 440/2008 of 30 May 2008. Using the non-amended procedure, solubility results in the range 1.05 x l0-4 to 2.26 x 10-4 g/L of solution at 20.0 ± 0.5 °C were obtained. However, based on structural information supplied by the Sponsor and other physico-chemical properties of the test material, specifically the extremely high partition coefficient result, these values were considered to systematically overestimate the true solubility of the test material. The cause for this error was attributed to surface active properties observed for the test material during the extended saturation shaking periods required by EC Method A6 preventing complete sample clean-up prior to analysis. The essential insolubility of the test material was also fully supported by the specialised predictive sohare, WSKOWWIN, version 1.41, 2000 US Environmental Protection Agency. Using a fragment constant methodology, the water solubility of the individual components of the test material were estimated to be significantly below 1 ppt (< 1 x 10-9 g/L of solution).
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