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EC number: 236-715-1 | CAS number: 13466-20-1
- 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
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 04-Dec-2015
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- GLP guideline study. The performance was without restrictions. However the test results need to be evaluated by comparing other data due to the nature of substancce.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- adopted July 27, 1995
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- May 31, 2008
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Hess. Ministerium für Umwelt, Energie, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany
- Type of method:
- capillary method
- Specific details on test material used for the study:
- - Appearance: solid/white
- Analytical purity: >92% based on 44.8 % BaO and 42.8 % P2O5
- Batch No.: 9000008613
- Expiration date of the lot/batch: April 23, 2017
- Storage conditions: At room temperature (20 °C ± 5 °C) in the dark - Key result
- Melting / freezing pt.:
- >= 234.3 - <= 237.3 °C
- Atm. press.:
- ca. 1 013 hPa
- Endpoint:
- melting point/freezing point
- Type of information:
- other: Expert statement based on the experimental tests
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Reason / purpose for cross-reference:
- reference to same study
- Principles of method if other than guideline:
- Differential thermal analysis as well as thermogravimetric analysis were preformed. In addition a sample was determined by XRD at 300 °C to confirm the condensation of orthophosphate to pyrophosphate.
- GLP compliance:
- no
- Type of method:
- thermal analysis
- Remarks:
- as well as themogravimeric analysis
- Key result
- Atm. press.:
- ca. 1 013 hPa
- Decomposition:
- yes
- Decomp. temp.:
- >= 240 °C
Referenceopen allclose all
In the preliminary test the test item melted at 245 °C.
The test item showed only two stages of melting. The melting started at 234.3 °C. At 237.3 °C the stage B of melting was reached (for details see Table below). After the stage B the test item was completely liquid.
Results for the Determination of the Melting Point / Melting Range
Experiment No. |
Stage A [°C] |
Stage B [°C] |
Stage C [°C] |
Stage D [°C] |
Stage E [°C] |
1 |
234.3 |
237.3 |
n.d. |
n.d |
n.d |
2 |
234.3 |
237.2 |
n.d |
n.d |
n.d |
3 |
234.2 |
237.3 |
n.d |
n.d |
n.d |
Mean (n=3) |
234.3 |
237.3 |
n.d |
n.d |
n.d |
|
507.4 K |
510.4 K |
n.d |
n.d |
n.d |
Stage A: Beginning of melting / wet pointStage
B: Shrinkage pointStage
C: Collapse pointStage
D: Liquefying pointStage
E: Final Stage of melting
n.d. not determined
Based on the company experience of registrant on this type of phosphate substances, the melting point measured for barium bis(dihydrogen orthophosphate) (study no. 108281180) is not really the melting point of substance itself. Because along with increasing temperature the condensation reaction begins, the water is obtained in the test matrix and barium bis(dihydrogen orthophosphate) dissolved in the water at once. Therefore it seems that the substance melts and becomes liquid. However this stage exists only in a short period. When more barium pyrophosphate is formed the substance becomes again an insoluble solid. And during further the polymerization reaction the metaphosphate obtained is more insoluble, and it has a melting point over 1560 °C.
The process of these transitions begins with two phosphate units coming together in a condensation reaction shown as following:
Ba(H2PO4)2 – H2O -> BaH2P2O7 – H2O -> Ba(PO3)2
In order to confirm the observation and assumption, the differential thermal analysis as well as thermogravimeric analysis internally. The thermogram shows two mass changes: in the temperature range of 240 – 280 °C and 350 – 400 °C. The first change has a mass loss of 7.02%, which indicates clearly a transition of dihydrogen orthophosphate to pyrophosphate (BaH2P2O7). Afterwards barium pyrophosphate polymerizes sequently to metaphosphate [Ba(PO3)2] at 350 – 400 °C with a mass loss of 3.60%.
Also the registrant has characterized the substance at 300 °C by means of X-Ray powder diffraction. Comparing with the standard diffractogram of barium bis(dihydrogen orthophosphate), barium pyrophosphate and barium metaphosphate, it shows that the test substance changes completely at 300 °C and condenses to barium pyrophosphate or barium metaphosphate.
Therefore it can be concluded that the substance barium bis(dihydrogen orthophosphate) decomposes before melting and boiling. The condensation reaction followed by polymerization happens along with increasing temperature.
Description of key information
not applicable
Key value for chemical safety assessment
Additional information
The test substance decomposes before melting and boiling. The condensation reaction followed by polymerization happens along with increasing temperature (DTA and TGA). The substance becomes barium pyrophosphate or barium metaphosphate, which are confirmed by XRD.
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