Benzenesulfonic acid, 4-dodecyl-, cerium(4+) salt, basic

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:

2018-04-05 to 2018-05-07

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: Thermal Stability (OECD 113)

Version / remarks:

1981

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2017-02-28

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

Storage Conditions: Room temperature, sealed container

Atm. press.:

1 005.1 hPa

Decomposition:

yes

Decomp. temp.:

150 °C

Melting /Boiling Point

In both DSC runs one very small exothermic effect in the temperature range from 190 °C through 280 °C was observed (associated energy release* -10 J/g). Apart from that, both DSC runs show an endothermic effect in the temperature range from 330 °C through 450 °C. In both DSC runs no further endothermic or exothermic effect was detected.

Results of the DSC-measurements

No.	Sample weight [mg]	Onset of Effect [°C]	Range of effect [°C]	Weight loss	Atmospheric pressure [hPa]
PN15385	21.26	200 365.92	200 – 280 (exo) 330 – 450 (endo)	5.21 mg 24.5 %	1005.1
PN15386	17.00	190 375.69	190 – 280 (exo) 340 – 450 (endo)	4.94 mg 24 %	1005.1

During the heating phase one endothermic effect was observed in the temperature range of 330 °C – 450 °C, which cannot be assigned to the melting of the test item, because an exothermic effect is observed previously at 190 °C. In correlation to the determination of the thermal stability, the test item showed an exothermic effect starting at approx. 160 °C. Thus, no melting or boiling of the test item could be detected up to its decomposition starting at approx.160 °C under atmospheric pressure.

 

For verification of the DSC results the test item was additionally tested in a test glass:

At approx.150 °C white mist started to form and rose in the test glass. At approx. 300 °C the colour of the test item changed to black and the test item decomposed. No melting or boiling of the test item could be observed up to the maximum test temperature of approx. 300 °C.

Thermal stability (DSC)

The test item showed exothermic effects starting from 160 °C with an energy release* of -20 J/g and starting from 540 °C with an energy release of -90 J/g. Apart from that an endothermic effect was observed starting at 350 °C.

Results of the DSC-measurements

No.	Sample weight / mg	Start of effect / °C	Energy*^[J/g]
PN15387	6.49	160 350 540	-20 (exothermic) 30 (endothermic) -90 (exothermic)
PN15388	5.34	160 370 540	-20 (exothermic) 20 (endothermic) -50 (exothermic)

* Negative energy for exothermic processes

Conclusions:

Melting and Boiling Point:
No melting or boiling of the test item benzenesulfonic acid, 4-dodecyl-, cerium(4+) salt, basic was observed at atmospheric pressure (1005 hPa) as determined by differential scanning calorimetry according to Regulation EC No. 440/2008 Methods A.1./A.2. and OECD Test Guidelines 102/103 (1995). At approx. 190 °C, the test item shows an exothermic effect in the DSC measurements.
The visual observation of the test item being heated in a test glass gave that white mist started to form and rose in the test glass at approx. 150 °C and that the test item colored black and decomposed at approx. 300 °C.
Based on the results and observations no distinct phase transitions, melting and boiling can be derived for the test item. The test item starts to decompose with a mass loss of approx. 25 % before melting and boiling at approx. 150 °C.

Thermal Stability:
In the differential scanning calorimetry measurements according to OECD Test Guideline 113 (1981) the test item benzenesulfonic acid, 4-dodecyl-, cerium(4+) salt, basic showed an exothermic effects starting at 160 °C with an energy release of -20 J/g, an endothermic effect starting at 350 °C and another exothermic effect starting at 540 °C with an energy release of -90 J/g.

Description of key information

No melting or boiling of the test item benzenesulfonic acid, 4-dodecyl-, cerium(4+) salt, basic was observed up to the decomposition temperature of approx. 150 °C at atmospheric pressure (1005 hPa).

Additional information

Melting and Boiling Point:

No melting or boiling of the test item benzenesulfonicacid, 4-dodecyl-, cerium(4+) salt, basic was observed at atmospheric pressure (1005 hPa) as determined by differential scanning calorimetry according to Regulation EC No. 440/2008 Methods A.1./A.2. and OECD Test Guidelines 102/103 (1995). At approx. 190 °C, the test item shows an exothermic effect in the DSC measurements.

The visual observation of the test item being heated in a test glass gave that white mist started to form and rose in the test glass at approx. 150 °C and that the test item coloured black and decomposed at approx. 300 °C.

Based on the results and observations no distinct phase transitions, melting and boiling can be derived for the test item. The test item starts to decompose with a mass loss of approx. 25 % before melting and boiling at approx. 150 °C.

Thermal Stability:

In the differential scanning calorimetry measurements according to OECD Test Guideline 113 (1981) the test item benzenesulfonic acid, 4-dodecyl-, cerium(4+) salt, basic showed an exothermic effect* starting at 160 °C with an energy release of -20 J/g, an endothermic effect starting at 350 °C and another exothermic effect starting at 540 °C with an energy release of -90 J/g.

*Negative energy release for exothermic processes