Lithium acetate

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016-11-10 to 2016-11-17

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

July 27th, 1995

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Batch No.of test material: 09406DE

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: At room temperature (15-30°C). Keep containers tightly closed in a dry and well-ventilated place.
- Expiration date of the lot/batch: May 2018

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: The test item was dried and ground. Drying was done in a desiccator overnight.

Key result

Atm. press.:

1 013 hPa

Decomposition:

yes

Decomp. temp.:

379.12 °C

Remarks on result:

not determinable

Pre-Test following SIWOLOBOFF

A colourless condensate was visible at 124 °C. Melting of the test substance was observed at 287 °C. The test item melted to a clear, slightly yellow liquid. At 370 °C many bubbles were visible, but no boiling chain could be observed. A colour change was observed from yellow to brown.

At 374 °C very strong bubble formation was visible and a colourless gas exhausted. The strong reaction of the sample occurred together with a colour change to dirty white. The test was then stopped.

After cooling the test sample solidified as dirty white mass.

Security Pre-Test for the DSC instrument

The weight of the crucible was recorded with 48.27 mg. The crucible remained visually unchanged after heating it to 420 °C in the muffle furnace. The crucible remained visually unchanged after further heating to 600 °C and cooling down. The weight was recorded with 47.03 mg.

Values DSC first determination

	Temperature (°C)	Energy
First Event [°C]	106.98 (Onset)	129.18 [J/g]
Melting Point [°C]	284.27 (Onset)	192.61[J/g]
Start of Decomposition [°C]	384.38	14.92 [mW]*

 

Values DSC second determination

	Temperature (°C)	Energy
First Event [°C]	105.59 (Onset)	165.65 [J/g]
Melting Point [°C]	284.05 (Onset)	186.44 [J/g]
Start of Decomposition [°C]	379.36	16.83 [mW]*

 

Values DSC third determination

	Temperature (°C)	Energy
First Event [°C]	109.5 (Onset)	165.65 [J/g]
Melting Point [°C]	284.05 (Onset)	186.44 [J/g]
Start of Decomposition [°C]	379.36	16.83 [mW]*

Observations

	Mass test item	Mass crucible (before measurement)	Mass crucible (after measurement)	Observations
First Measurement	1.88 mg	47.51 mg	47.23 mg	After the test, the crucible was visually unchanged. The crucible was opened; the test item also remained visually unchanged.
Second Measurement	2.23 mg	47.94 mg	47.54 mg	After the test, the crucible was visually unchanged.
Third Measurement	1.65 mg	47.97 mg	47.21 mg	After the test, the crucible was visually unchanged. The crucible was opened; a black residue was left. (sign for decomposition)

Results

First Event	in °C	in K
First Determination	106.98	380.13
Second Determination	105.59	378.74
Third Determination	109.50	382.65
Mean*	106.29	379.44
sd	0.98	0.98
* For the mean value the results of the first and second determination were taken.
Melting Point	in °C	in K
First Determination	284.27	557.42
Second Determination	284.05	557.20
Third Determination	284.29	557.44
Mean*	284.20	557.35
sd	0.13	0.13
* All values were taken for the mean value.
Decomposition	in °C	in K
First Determination	384.38	657.53
Second Determination	379.36	652.51
Third Determination	378.88	652.03
Mean*	379.12	652.27
sd	0.34	0.34
* For the mean value the results of the second and third determination were taken.

Conclusions:

No boiling point could be determined. The substance decomposed before boiling.

Executive summary:

The determination of the boiling point of lithium acetate was performed via DSC (differential scanning calorimetry) according to OECD guideline 103. Three events were detected.

The first event was determined at: 106.29 ± 0.98 °C (379.44 ± 0.98 K)

This event did not show the typical form of a glass transition. Therefore it is plausibly assumed that the first event is the dehydration of the test substance, which is also shown by an endothermic event.

The second event (the melting point) was determined at: 284.20 ± 0.13 °C (557.35 ± 0.13 K)

The last event (the beginning decomposition of the test item) was determined at: 379.12 ± 0.34 °C (652.27 ± 0.34 K)

Therefore no boiling point could be determined.

Description of key information

No boiling point could be detected as the substance decomposes before boiling.

Additional information

The boiling point of the lithium acetate was determined according to OECD guideline 103 and EU method A.2. The determination of the boiling point of lithium acetate was performed via DSC (differential scanning calorimetry).

Three events were detected.

The first event was determined at: 106.29 ± 0.98 °C (379.44 ± 0.98 K)

This event did not show the typical form of a glass transition. Therefore it is plausibly assumed that the first event is the dehydration of the test substance, which is also shown by an endothermic event.

The second event (the melting point) was determined at: 284.20 ± 0.13 °C (557.35 ± 0.13 K)

The last event (the beginning decomposition of the test item) was determined at: 379.12 ± 0.34 °C (652.27 ± 0.34 K)

Therefore, no boiling point could be determined.