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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
no
Type of method:
thermal analysis
Remarks:
Differential Thermal Analysis
Decomposition:
yes
Remarks:
Between about 130 °C and 230 °C and from about 300 °C endothermic effects are detected which indicates an endothermic decomposition.
Decomp. temp.:
ca. 130 °C
Conclusions:
For Anthrachinon-2-sulfonic acid sodium salt no melting point could be detected (1,017 hPa) according to EC A.1.
Executive summary:

The test was performed as stipulated in EC Test Procedure A.1 'Melting/Freezing Temperature' – ASTM E 537 ‘Standard method for assessing the thermal stability of chemicals by methods of differential thermal analysis’.

The Differential Thermal Analysis (DTA) was used. This technique records the difference of the temperature of a substance and an empty measuring cell. The substance and reference cell were subjected to the same controlled temperature programme. The screening-DTA (heating rate 3 K/min, closed glass ampoule) of the sample shows several

endothermic effects. Between about 130 °C and 230 °C and from about 300 °C endothermic effects are detected which indicates an endothermic decomposition. The second run of the sample shows that the endothermic effect observed at

about 420 °C is the melting of the decomposition product of the original sample.

For Anthrachinon-2 -sulfonic acid sodium salt no melting point could be detected (1,017 hPa) according to EC A.1.

Description of key information

For Anthrachinon-2-sulfonic acid sodium salt no melting point could be detected (1,017 hPa) according to EC A.1.

Between about 130 °C and 230 °C and from about 300 °C endothermic effects are detected which indicates an endothermic decomposition.

Key value for chemical safety assessment

Additional information