Cerium(4+) disulphate

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:

from 2016-05-18 to 2016-07-08

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)

Remarks:

Siemens AG Prozess-Sicherheit, Industriepark Hochst, B 596/598, 65926 Frankfurt am Main, Germany

Type of method:

differential scanning calorimetry

Key result

Atm. press.:

1 013.3 hPa

Decomposition:

yes

Decomp. temp.:

ca. 200 °C

Remarks on result:

other: due to release of water from the hydrate

Two DSC measurements with a heating rate of 10 K/min showed an endothermal effect in the temperature range of 200 - 325 °C and a second endothermal effect in the temperature range 370 - 440 °C. The onset temperature (see Table 1) was derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline. A third DSC measurement (final test temperature: 350 °C) showed an endothermal effect in the temperature range of 220 - 310°C.

After the measurements with a final test temperature of 500 °C the test item was still solid. In consideration of the mass loss detected after the third measurement it can be assumed that the first endothermal effect is decomposition under release of water.

 

Table 1: Melting point (DSC measurements)

Ident No.	Test item / mg	Starting temperature / °C	Final test temperature / °C	Temperature range (melting) / °C	Onset / °C	Crucible	Observations
35559	9.15	25	500	200 – 310 370 – 430	228.84 380.65	Glass, open	Test item was a white solid after the measurement, mass loss: 30%
35563	25.49	25	500	230 – 325 380 – 440	249.96 389.94	Glass, open	Test item was a yellow solid after the measurement, mass loss: 28%
35568	16.16	25	350	220 – 310	240.24	Glass, open	Test item was a yellow solid after the measurement, mass loss: 18%

 

Conclusions:

The test item has no melting point up to 500 °C. Decomposition (due to release of water) was observed at approximately 200 °C.

Executive summary:

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OPPTS test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry. The test item was weighed out into a glass crucible under an inert atmosphere (nitrogen). Three tests with 9 – 25 mg of the test item were performed. As reference crucible, an empty glass crucible was used. The substance is a solid at ambient conditions. The crucibles were heated up to 500 °C (last test up to maximum 350°C) at a constant heating rate of 10 K/min. In the temperature range of 200 °C – 325 °C, an endothermal effect was observed in the three tests. Mass loss in the range of 18 - 30% was observed in all tests. After the measurements with a final test temperature of 500 °C the test item was still a solid. In consideration of the mass loss detected after the third measurement it can be assumed that the first endothermal effect is decomposition under release of water. Therefore the test item has no melting point up to 500°C. No observations were made which cause doubt of the validity of the outcome of the study.

Description of key information

The test item has no melting point up to 500 °C. Decomposition (due to release of water) was observed at approximately 200 °C.

Additional information

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OPPTS test guideline 830.7200 (reference 4.2-1) to determine the melting point of the test item using differential scanning calorimetry. The test item was weighed out into a glass crucible under an inert atmosphere (nitrogen). Three tests with 9 – 25 mg of the test item were performed. As reference crucible, an empty glass crucible was used. The substance is a solid at ambient conditions. The crucibles were heated up to 500 °C (last test up to maximum 350°C) at a constant heating rate of 10 K/min. In the temperature range of 200 °C – 325 °C, an endothermal effect was observed in the three tests. Mass loss in the range of 18 - 30% was observed in all tests. After the measurements with a final test temperature of 500 °C the test item was still a solid. In consideration of the mass loss detected after the third measurement it can be assumed that the first endothermal effect is decomposition under release of water. Therefore the test item has no melting point up to 500°C. No observations were made which cause doubt of the validity of the outcome of the study.