Yttrium(3+) acetate

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:

11 September 2017 to 02 November 2017

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)

Type of method:

differential scanning calorimetry

Key result

Decomposition:

yes

Decomp. temp.:

ca. 288 °C

Remarks on result:

other: air atmosphere (standard atmospheric pressure)

Table 1: Thermographic Data

Thermal Event	Interpretation	Temperature (°C)
		Determination 1	Determination 2
Endotherms	Loss of hydration and/or other volatile substance	~51 to 166	~61 to 167
Endotherm	Onset of decomposition	~296	~288
	Extrapolated onset of decomposition	377	377

 

- After heating to 400 °C, the samples had lost approximately 51 and 60 % of their original weight for Determinations 1 and 2 respectively.

- Overall result: Decomposed from approximately 288 °C (561 K)

 

DISCUSSION

- Additional thermograms were generated to assess the endothermic events. Determinations 5 and 6 resulted in a residue that was a white powder and loss of approximately 21 % of their original weight. The appearance suggested decomposition had not occurred.

- Thermal programs for Determinations 3 and 4 were initially the same as for Determinations 5 and 6 respectively, but were both then heated again. This was to check that the endotherms highlighted by Determination 5 and 6 were not repeated on re-heating indicating they were due to loss of test material. Determinations 3 and 4 lost approximately 57 and 53 % of their original weight respectively which, along with the residue’s appearance, was the same as for Determinations 1 and 2.

- There was also a small endotherm doublet at approximately 190 °C (463 K) which was considered not significant to interpreting the test result.

- The overall test result was based on Determinations 1 and 2. However, as a result of the initial low rate of enthalpy change during decomposition, the onset temperature could only be approximated.

Conclusions:

Under the conditions of this study, the test material was determined to decompose from approximately 288 °C (561 K). As the test material decomposed, no value for melting point could be determined.

Executive summary:

The melting point of the test material was investigated in accordance with the standardised guidelines OECD 102 and EU Method A.1, under GLP conditions.

The testing was performed using differential scanning calorimetry.

After heating to 400 °C, the samples had lost approximately 51 and 60 % of their original weight for Determinations 1 and 2 respectively.

Under the conditions of this study, the test material was determined to decompose from approximately 288 °C (561 K). As the test material decomposed, no value for melting point could be determined.

Description of key information

Under the conditions of this study, the test material was determined to decompose from approximately 288 °C (561 K). As the test material decomposed, no value for melting point could be determined.

Additional information

The melting point of the test material was investigated in accordance with the standardised guidelines OECD 102 and EU Method A.1, under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

The testing was performed using differential scanning calorimetry.

After heating to 400 °C, the samples had lost approximately 51 and 60 % of their original weight for Determinations 1 and 2 respectively.

Under the conditions of this study, the test material was determined to decompose from approximately 288 °C (561 K). As the test material decomposed, no value for melting point could be determined.