Registration Dossier
Registration Dossier
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EC number: 205-126-1 | CAS number: 134-03-2
Boiling point
Administrative data
Link to relevant study record(s)
- Endpoint:
- boiling point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2009-12-22 to 2010-03-23
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.2 (Boiling Temperature)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 103 (Boiling point/boiling range)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Key result
- Decomposition:
- yes
- Decomp. temp.:
- ca. 233 °C
- Conclusions:
- The test item did not boil under the conditions of the test. Instead, decomposition of the test item started at 233 °C. The atmospheric pressure during the measurements was 97.1 kPa.
- Executive summary:
Sodium ascorbate crystalline did not boil under the conditions of the test. Decomposition started at about 233 °C. This result was obtained using Differential Scanning Calorimetry (Thermal Analysis) method. The atmospheric pressure during the measurements was 97.1 kPa.
Reference
Preliminary Test
The DSC-curve of the preliminary test (heating rate of 20 °C/min from 25 °C to 400 °C) is shown in Figure 1 (see attachements). A small endothermic peak started at about 232 °C directly followed by an exothermic peak starting at about 238 °C. After the experiment, the sample had lost about 52% of its mass and a black swelled residue remained.
Main Test
In order to confirm the result obtained in the preliminary test,a further DSC run was recorded in the temperature range between 25 °C and 400 °C (heating rate adjusted to 10 °C/min). The small endothermic heat effect started at about 230 °C followed by an exothermic heat effect (decomposition) starting at about 233 °C. After the experiment, the sample had run out of the sample cup and lost about 48% of its mass.
Description of key information
The test item did not boil under the conditions of the test. Instead, decomposition of the test item started at 233 °C. The atmospheric pressure during the measurements was 97.1 kPa.
Key value for chemical safety assessment
Additional information
Sodium ascorbate crystalline did not boil under the conditions of the test. Decomposition started at about 233 °C. This result was obtained using Differential Scanning Calorimetry (Thermal Analysis) method. The atmospheric pressure during the measurements was 97.1 kPa.
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