Registration Dossier
Registration Dossier
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EC number: 701-215-9 | CAS number: -
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- DTPMP (1-3Na) is a member of the DTPMP category, which is comprised of the acid form and any simple salts of the same acid.
The category hypothesis is that all the members are various ionised forms of the same parent acid. This category covers various sodium, potassium and ammonium salts of diethylene triamine penta(methylene phosphonic acid) (DTPMP). The different salts are prepared by neutralising the acid to a specific pH and accordingly the proportions of the constituents and their degree of ionisation are comparable between substances under similar conditions (in vivo and in the environment). All category members are based on the DTPMP structure. Property data are available for the acid form and some salts.
The read-across is therefore based on the presence of common functional groups in both the acid and the salt. The main assumption is that sodium is not significant in respect of all the properties under consideration. The sodium salt is expected to decompose before boiling and have a high melting temperature. - Reason / purpose for cross-reference:
- read-across source
- Key result
- Melting / freezing pt.:
- 723 K
- Decomposition:
- yes
- Remarks:
- Test item gradually decomposed upon heating
- Sublimation:
- no
- Remarks on result:
- other: No atmospheric pressure was recorded for this endpoint.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- Testing was conducted between 31 March 2010 and 24 August 2010.
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- 723 K
- Decomposition:
- yes
- Remarks:
- Test item gradually decomposed upon heating
- Sublimation:
- no
- Remarks on result:
- other: No atmospheric pressure was recorded for this endpoint.
- Conclusions:
- The melting/freezing temperature of the test item has been determined to be not less than 450°C (723K). The test item was determined to gradually decompose upon heating.
- Executive summary:
Two physico-chemical properties of the test item have been determined.
Methods employed are designed to be compatible with those specified in Commission Regulation (EC) No 440/2008 of 30 May 2008, Part A: Methods for the determination of physico-chemical properties.
Method
The determination was carried out by differential scanning calorimetry (DSC) using the procedure specified in ASTM E537-86 designed to be compatible with Method A1 Melting/Freezing Temperature ofCommissionRegulation (EC) No 440/2008 of 30 May 2008.
Conclusion
The melting/freezing temperature of the test item has been determined to be not less than 450°C (723K). The test item was determined to gradually decompose upon heating.
Referenceopen allclose all
Please see Attachment 1 for Results.
Description of key information
Melting point: The acid form [DTPMP-H] was observed to have a melting/freezing temperature of >450°C (723 K) and to gradually decompose when heated (Tremain 2010). This conclusion is read across to the salt to indicate that DTPMP (1-3Na) will also undergo decomposition when heated.
Key value for chemical safety assessment
Additional information
The melting point of the anhydrous form of the parent acid (DTPMP-H) was determined using differential scanning calorimetry (DSC) in accordance with EU Method A.1 test method. DTPMP-H (anhydrous form) was observed to have a melting/freezing temperature of >450°C (723 K) and undergo gradual decomposition when heated.
This result is read-across to the salt, DTPMP (1-3Na); that the salt will have a higher melting point than the parent acid and also undergoes thermal decomposition when heated. Salts would be expected to melt at a higher temperature than the parent acid, and to decompose on heating.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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