Triethyl phosphonoacetate

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 16 December 2011 to 3 September 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Study conducted in compliance with international and OECD standard guidelines under GLP conditions. The study report was well documented with all mandatory information included.

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling point/boiling range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

GLP compliance:

yes

Remarks:

2011-08-31

Type of method:

differential scanning calorimetry

Boiling pt.:

269 °C

Atm. press.:

99.7 kPa

Decomposition:

yes

Remarks on result:

other: The test item underwent partial boiling, with decomposition at this temperature

Preliminary screening test:

Thermal Event	Interpretation	Temperature
		°C	K
Endotherm onset temperature	Onset of partial boiling with decomposition	269.08	542

Atmospheric pressure: 99.7kPa

Definitive test: determination 1

Thermal Event	Interpretation	Temperature
		°C	K
Endotherm onset temperature	Onset of partial boiling with decomposition	270.90	544

Atmospheric pressure: 99.7kPa

Definitive test: determination 2

Thermal Event	Interpretation	Temperature
		°C	K
Endotherm onset temperature	Onset of partial boiling with decomposition	269.77	543

Atmospheric pressure: 99.7kPa

The thermograms for preliminary screening test, determination 1 and determination 2 are shown in the attached illustration.

Discussion:

The final residue on completion of each determination indicated decomposition of the test item and as such, boiling was incomplete. Due to decomposition, the definitive test determinations were performed with a higher program start temperature, to minimize the time the test item was exposed to an elevated temperature. However an approximately equal onset temperature was obtained with respect to the preliminary test and therefore the overall result has been taken as the lowest observed onset temperature obtained from all three determinations performed.

Conclusions:

The test item underwent partial boiling, with decomposition from approximately 269°C (542 K) at 99.7kPa.

Executive summary:

The determination was carried out by differential scanning calorimetry (DSC), according to the Method A2 Boiling Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008, Method 103 of the OECD Guidelines for Testing of Chemicals, 27 July 1995 and according to GLP. No deviation from the guideline was observed during the test.

A phase transformation (e.g. evaporation) or a reaction (e.g. decomposition) is associated with a heat effect. In a calorimeter, two identical crucibles, one containing the test item and the other empty (used as a reference), are heated at a constant rate. During the experiment, the heat effect, i.e. the difference in heat flow between the sample crucible and the reference crucible, is recorded.

The temperature accuracy of the DSC was assessed using a reference standard. According to results obtained with the reference standard, the DSC was considered acceptable for use.

The test item underwent partial boiling, with decomposition from approximately 269°C (542 K) at 99.7kPa.

Description of key information

Experimental determination of boiling temperature of the test item: partial boiling with decomposition at approximately 269°C (542 K) at 99.7 kPa

.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

269 °C

Additional information

The determination was carried out by differential scanning calorimetry (DSC), according to the Method A2 Boiling Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008, Method 103 of the OECD Guidelines for Testing of Chemicals, 27 July 1995 and according to GLP. No deviation from the guideline was observed during the test.

The temperature accuracy of the DSC was assessed using a reference standard. According to results obtained with the reference standard, the DSC was considered acceptable for use.