Sodium ascorbate

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2009-12-10 to 2010-03-25

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

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

thermal analysis

Remarks:

Differential scanning calorimetry (DSC)

Specific details on test material used for the study:

- Batch Number: TL00910581

Key result

Decomposition:

yes

Decomp. temp.:

ca. 232 °C

Preliminary Tests

The DSC-curve of the preliminary test (heating rate of 20 °C/min from 25 °C to 400 °C) is shown in Figure 1. A small endothermic peak started at about 229 °C directly followed by an exothermic peak starting at about 238 °C. After the experiment, the sample had lost about 39% of its mass and a black residue remained.

 

For the interpretation of the endothermic heat effect, a capillary test was carried out in the temperature range between 25°C and 400°C (heating rate 20°C/min). At 195 °C the test item changed its color to yellow/beige, at about 226 °C the test item started swelling and at about 243 °C it was boiling and evaporated. No melting could be observed. At the end a dark brown shiny residue remained.

 

Main Tests

A further DSC run was recorded in the temperature range between 25 °C and 400 °C (heating rate adjusted to 10 °C/min). An exothermic heat effect (decomposition) started at 232 °C. After the experiment, the sample had run out of the sample cup and lost about 43% of its mass.

Conclusions:

The test item did not melt under the conditions of the test. Instead, decomposition of the test item started at 232 °C.

Executive summary:

The test item did not melt under the test conditions. Decomposition started at about 232 °C. This result was obtained using Differential Scanning Calorimetry (Thermal Analysis) method.

Description of key information

The test item did not melt under the conditions of the test. Instead, decomposition of the test item started at 232 °C.

Additional information

The test item did not melt under the test conditions. Decomposition started at about 232 °C. This result was obtained using Differential Scanning Calorimetry (Thermal Analysis) method.