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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:
2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Name sodium 3-sulfobenzoate
Batch no. 170103
CAS No. 17625-03-5
Purity > 99.0% (Titration with NaOH, Glass indicating electrode, Calomel reference electrode)
Expiry date 14. Feb. 2019
Storage Room Temperature (20 ± 5°C), keep away from humidity
Melting / freezing pt.:
>= 356.91 - <= 361.99 °C
Atm. press.:
ca. 760 mm Hg
Decomposition:
yes
Decomp. temp.:
>= 447.68 °C

 Melting point  Temperature °C
 1 Determination  361.99
 2 Determination  356.91
 3 Determination  357.59
Min  356.91
Max  361.99

Interpretation of the measurements

Three reasonable endothermic events were detected in all three measurements. In all determinations a baseline rising was observed. The crucible was opened after measurement of the first determination, the test substance was rarely changed and after measurement of the third determination with a higher temperature a black residue was visible.

In pre-tests the colour change which is a sign of decomposition was observed. The colour change and the base line rising confirmed this.

Therefore the first event should be stated as solid-solid transition (at temperature ≥ 282.59 ≤ 286.03 °C), the second event as melting point, the third event as boiling point and the beginning of the decomposition in the third determination was evaluated with event mark function of the DSC software.

Conclusions:
The melting point of sodium hydrogen m-sulphonatobenzoate is ≥ 356.91 °C ≤ 361.99 °C.
Executive summary:

The determination of the melting point of sodium 3-sulfobenzoate was performed via DSC (differential scanning calorimetry), according to OECD Guideline 102 and EU Method A.1. As a result, the melting point of sodium 3-sulfobenzoate is ≥ 356.91 °C ≤ 361.99 °C.

Description of key information

The determination of the melting point of sodium 3-sulfobenzoate was performed via DSC (differential scanning calorimetry), according to OECD Guideline 102 and EU Method A.1. As a result, the melting point of sodium 3-sulfobenzoate is ≥ 356.91 °C ≤ 361.99 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
356.91 °C

Additional information

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