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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
07 Feb - 27 Mar 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
GLP compliance:
yes (incl. QA statement)
Remarks:
Hess. Ministerium für Umwelt, Klimaschutz, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany
Type of method:
differential scanning calorimetry
Remarks:
followed by capillary method
Specific details on test material used for the study:
Storage conditions: room temperature
Atm. press.:
1 003 hPa
Decomposition:
yes
Decomp. temp.:
ca. 260 °C
Remarks on result:
other: The dried solid test item has no melting point up to the decomposition temperature.

Results
Residual moisture
The test item was dried until constant weight. 80.82 % moisture could be removed.

 

DSC Measurements
In the temperature range of 60 – 230 °C a first broad endothermic effect was observed, directly followed by a second endothermic effect in the temperature range of 230 – 300 °C. In the temperature range of 420 – 450 °C a small exothermic effect could be detected, with a decomposition energy of -20 J/g.

Table 1 – DSC measurement results

Sample weight [mg]

Onset of effect [°C]

Range of effect [°C]

Weight loss [mg]

Atmospheric pressure [hPa]

8.19

137.07
242.35

--

60 – 230 (endo)
230 – 300 (endo)
420 – 450 (exo)

4.08

1002.9

11.40

124.85
242.62

--

60 – 230 (endo)
230 – 300 (endo)
430 – 450 (exo)

5.89

1002.9

During the heating phase two endothermic effect were observed in the temperature ranges of 60 – 230 °C and 230 – 300 °C, which can’t be clearly assigned to the melting of the test item.

Thus an additional measurement by means of the capillary method was performed for a verification of the DSC results.

 

Capillary Method
The additional tests with the capillary method showed no change of the test item up to a temperature of 250 °C. At 250 °C the test item raised in the capillary and at approx. 260 °C the colour of the test item changed from white to brown. No melting or boiling of the test item could be observed up to its decomposition.

Combining the results of the DSC-measurements and the capillary method, the endothermic effects in the DSC can’t be assigned to the melting or boiling of the test item. They could be caused by evaporating gas.

The dried solid test item has no melting point and no boiling point up to the decomposition starting at approx. 260 °C.

 

Conclusion
The dried solid test item ETA Lösung 181 / TRISODIUM EDTA SOLUTION 20% has no melting point up to the decomposition temperature of approx. 260 °C at atmospheric pressure (1003 hPa) as determined by differential scanning calorimetry and varificated by means of the capillary method according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).

 

 

Description of key information

No melting point at 1003 hPa (OECD Guideline 102, Differential Scanning Calorimetry).

Key value for chemical safety assessment

Additional information

The test item has no melting point up to the decomposition temperature of approx. 260 °C at atmospheric pressure (1003 hPa) as determined by differential scanning calorimetry and verified by means of the capillary method according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).