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Diss Factsheets
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EC number: 204-874-6 | CAS number: 127-96-8
- 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
Melting point / freezing point
Administrative data
- Endpoint:
- melting point/freezing point
- Type of information:
- migrated information: read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Study performed according well-known techniques but not under GLP
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 000
Materials and methods
Test guideline
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Principles of method if other than guideline:
- Both Thermal Gravimetric Analysis (TGA) and Differential Thermal Analysis (DTA) had been performed in order to obtain complementary information and allowing differentiation between endothermic and exothermic events which have no associated weight loss (e.g., melting and crystallization) and those which involve a weight loss (e.g., degradation).
For Differential Thermal Analysis (DTA), sample was heated from 20°C to 350°C in a closed glass crucible with a heating rate of 3.0 K/min.
For Thermal Gravimetric Analysis (TGA), sample was heated from 20°C to 240°C under inert atmosphere in a open Aluminium Oxide crucible with a heating rate of 3.0 K/min. - GLP compliance:
- not specified
- Type of method:
- thermal analysis
Test material
- Reference substance name:
- Oxalic acid dihydrated
- IUPAC Name:
- Oxalic acid dihydrated
- Details on test material:
- Oxalic acid dihydrated
Constituent 1
Results and discussion
Melting / freezing point
- Sublimation:
- yes
- Subl. temp.:
- > 160 °C
- Remarks on result:
- other: at atmospheric pressure
Any other information on results incl. tables
2 endothermic phenomena have been observed belowin DTA:
- The first endothermic reaction started at 98 ºC (with a peak at 100 ºC) and has been attributed to loss of water of di-hydrated oxalic acid; this is has been proven via TGA showing a weight loss of 29% corresponding to water content of di-hydrated oxalic acid
- The second endothermic reaction started atand up to; TGA proved the loss of total remain weight (71%) corresponding to full decomposition of oxalic acid giving off gases and corresponding to sublimationApplicant's summary and conclusion
- Conclusions:
- The apparent melting point of di-hydrated oxalic acid is caused by loss of crystal water starting at 98°C with a maximum at 100°C. The anhydrous form of oxalic acid starts sublimation around 160°C.
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