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Physical & Chemical properties

Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
30 October 2017 to 06 December 2017
Reliability:
1 (reliable without restriction)
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7220 (Boiling Point / Boiling Range)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Lot number: 2000850599
Key result
Boiling pt.:
390.646 °C
Atm. press.:
ca. 1 atm
Decomposition:
no
Key result
Boiling pt.:
390.651 °C
Atm. press.:
ca. 1 atm
Decomposition:
no

Preliminary TGA test - Starting at 275°C, the weight of the sample decreased significantly. At 334°C, the sample weight had decreased by 25%.

After the experiment, no test item was observed in the sample container.

Main study

The DSC curve obtained with Experiment 1 is shown inFigure 2. An endothermic peak was observed between 100°C and 150°C. The extrapolated onset temperature of the peak was 124.844°C. The endothermic effect was most likely obtained due to melting of the test item. A broad endothermic peak was observed between 200°C and 375°C. After the experiment, no test item was observed in the sample container. The broad endothermic effect was probably obtained due to boiling or reaction and/or decomposition of the test item.

In order to confirm that melting caused the first endothermic peak, Experiment 2 was stopped directly after it. Figure 3shows the DSC curve obtained. Theextrapolated onset temperature was 125.120°C. After the experiment, a white molten residue remained in the sample container (original colour: off white). It demonstrated that melting was the reason for the endothermic effect.

In order to investigate the nature of the broad endothermic peak, a lower heating rate of 5°C/minute was applied in the Experiment 3. Figure 4shows the DSC curve obtained. The temperature range of the broad endothermic effect was similar to what was found in Experiment 1. This demonstrated that boiling of the test item was the reason for the endothermic effect. After the experiment, no test item was observed in the sample container. Since a lower heating rate was applied, the extrapolated onset temperature of the melting peak was not used for calculation of the melting temperature. 

In order to determine the extrapolated onset temperature of the boiling peak more test item was used inExperiment 4.The DSC curve obtained is shown inFigure 5. The extrapolated onset of the melting peak was 124.914°C. From 300°C an endothermic peak with anextrapolated onset temperature of 390.646°Cwas observed. After the experiment, no test item was observed in the sample container.

Experiment 5 was performed as a duplicate of Experiment 4. Figure 6shows the DSC curve obtained. Similar results as in Experiment 4 were obtained. The extrapolated onset of the melting peak was 125.119°C and the extrapolated onset of the boiling peak was 390.651°C.   After the experiment, no test item was observed in the sample container.

The melting temperature was determined as the mean melting temperature of Experiment 1 (124.844°C), Experiment 2 (125.120°C), Experiment 4 (124.914°C) and Experiment 5 (125.119°C).

The boiling temperature was determined as the mean boiling temperature of Experiment 4 (390.646°C) and Experiment 5 (390.651°C).

The boiling temperature was determined as the average melting temperature obtained from the Experiment 4 and Expermient 5.

Conclusions:
The boiling temperature of Tri-o-tolylphosphine were determined by DSC.
The boiling temperature of the test item was 390.6°C (663.8K).
The atmospheric pressure was 1006 ± 4 hPa.

Description of key information

The boiling temperature of Tri-o-tolylphosphine were determined by DSC.

The boiling temperature of the test item was 390.6°C (663.8K).

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
390.6 °C

Additional information