Cerium(3+) neodecanoate

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:

2018-12-06 to 2019-02-28

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

GLP compliance:

yes (incl. QA statement)

Remarks:

2017-02-28

Type of method:

differential scanning calorimetry

Remarks:

capillary method

Specific details on test material used for the study:

Storage conditions: Room temperature, closed

Decomposition:

yes

Decomp. temp.:

> 140 °C

Sublimation:

no

Remarks on result:

other: No definitive signs of a melting/boiling were observed

Melting and Boiling Point (DSC)

In the DSC runs PN16793 and PN16816 the test item showed a broad endothermic effect in the temperature range of 360 °C to >500 °C.

In the DSC run PN16797 a broad endothermic effect was observed in the temperature range of 370 °C to 430 °C directly followed by an exothermic effect in the temperature range of 430 °C to >500 °C, with a decomposition energy of greater -1960 J/g. Based on the appearance of the test item, the fact that the test substance was sampled without homogenisation and containing 8 % free acid, it can be assumed that the run PN16797 does not represents the test item correctly.

Results of the DSC-measurement

No.	Sample weight [mg]	Onset of Effect [°C]	Range of effect [°C]	Weight loss [mg]	Atmospheric pressure [hPa]	Remarks
PN16793	13.48	382	360 – >500 (endo)	10.94 81 %	1005.7
PN16797	12.32	379	370 – 430 (endo) 430 – >500 (exo)	9.18 75 %	1006.4
PN16816	17.57	385	360 – >500 (endo)	14.37 82 %	1008.0	homogenised sample

It is not possible to assign any of the observed endothermic effects definitely to melting or boiling of the test item.

Due to the fact that the measured weight loss of each sample was only between 75 % and 82 % of the respective initial sample weight, none of the observed endothermic effects can be assigned to boiling of cerium neodecanoate.

Measurements by the Capillary Method

For verification of the results the test item was additionally tested with the capillary method. There, the test item started to liquefy at a temperature of approx. 80 °C. During the liquefying process the test item changed the colour from brown to orange/yellow. At approx. 120 °C the test item to rose partly in the capillary and the colour was yellowish. At a temperature of ~140 °C a formation of bubbles could be observed. At ~150 °C the test item started to get darker. At ~200 °C the test item turned greenish. At ~230 °C formation of white crystals partly occured, at ~250 °C liquid fraction decreased, at ~300 °C the most part of liquid was evaporated and a residue remained in the capillary and got darker. The measurement was stopped at 400 °C with a black residue solid in the capillary. Neither a melting nor a boiling of the test item could be observed. It is assumed, that the test item decomposes at temperatures >150 °C.

A second measurement with the homogenised test item was tested with the capillary method. There, the test item started to liquefy at a temperature of approx. 70 °C. During the liquefying process the test item changed the colour from brown to orange/yellow. At approx. 100 °C a formation of small bubbles could be observed and at ~125 °C the bubbles get greater and the test item to rise in the capillary and flowed back. At ~140 °C the test item started to get darker. At ~200 °C the test item turned to green/brown/grey. At ~243 °C formation of white solid partly and at ~270 °C the most part of liquid was evaporated with an appearance of apricot colour. The measurement was stopped at 400 °C with a brown/apricot/green residue solid in the capillary. Neither a melting nor a boiling of the test item could be observed. It is assumed, that the test item decomposes at temperatures >140 °C.

Thermal Stability (DSC)

In the temperature range from 350 °C to >500 °C, a broad endothermic effect was observed. After the measurement a black residual of the test item remained in the crucible.

Results of the DSC-measurements

No.	Sample weight [mg]	Start of effect [°C]	Energy [J/g]
PN16830	14.18	360	+200 (endothermic)
PN16831	13.46	350	>+250 (endothermic)

      

Conclusions:

Melting and Boiling Point
No definitive signs of a melting/boiling of the test item cerium neodecanoate were observed by differential scanning calorimetry (DSC) measurements (open aluminium crucible under air, up to 500 °C, heating rate of 10 K/min) and by the capillary method (up to 400 °C, heating rate of 10 K/min). The measurements were performed according to Regulation (EC) No. 440/2008 Method A.1./A.2. and OECD Test Guideline 102/103 (1995) at atmospheric pressure (1002 – 1008 hPa). It is assumed that the test item decomposes at temperatures above 140 °C.

Thermal Stability
The test item cerium neodecanoate shows an endothermic effect in the temperature range from 350 °C to >500 °C.

Description of key information

Cerium neodecanoate decomposes at temperatures above 140 °C

Additional information

Melting and Boiling Point

No definitive signs of a melting/boiling of the test item cerium neodecanoate were observed by differential scanning calorimetry (DSC) measurements (open aluminium crucible under air, up to 500 °C, heating rate of 10 K/min) and by the capillary method (up to 400 °C, heating rate of 10 K/min). The measurements were performed according to Regulation (EC) No. 440/2008 Method A.1./A.2. and OECD Test Guideline 102/103 (1995) at atmospheric pressure (1002 – 1008 hPa). It is assumed that the test item decomposes at temperatures above 140 °C.

Thermal Stability

The test item cerium neodecanoate shows an endothermic effect in the temperature range from 350 °C to >500 °C.