Phosphoric acid, 2-ethylhexyl ester, sodium salt

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2018-02-27 to 2018-03-23

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

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

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7220 (Boiling Point / Boiling Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Boiling pt.:

173.8 °C

Atm. press.:

1 013.25 hPa

Decomposition:

yes

Decomp. temp.:

>= 229 °C

Melting and Boiling Point (DSC and Capillary Method)

In the temperature ranges of -50 - -0 °C, 40 - 160 °C, 170 – 220 °C and 220 - 300 °C, four endothermic effects were observed.

 

Results of the DSC-measurements

No.	Sample weight / mg	Onset of Effect / °C	Range of effect / °C	Weight loss / mg	Atmospheric pressure / hPa	Remark
PN15141	15.57	-13.97 96.52 173.27 287.99	-50 – 0 (endo) 40 – 160 (endo) 170 – 220 (endo) 230 – 300 (endo)	11.46	996.5
PN15197	11.27	-12.60 95.35 173.11 377.86	-40 – 0 (endo) 60 – 160 (endo) 170 – 220 (endo) 220 – 300 (endo)	8.50	997.8

 

During the cooling phase, no thermic effect could be observed in the DSC-measurements. During the subsequent heating phase a first endothermic effect was observed in the temperature range of -50 to 0 °C, which can be assigned to the softening of the test item. Three further endothermic effects were observed, which can’t be clearly assigned to a boiling of the test item. Thus, the test item was additionally investigated by means of the capillary method.

 

Therefore, three capillaries were filled with the test item up to a height of 5 mm. The capillaries were heated up from 25 °C to 300 °C with a constant heating rate of 10 K/min in the Stuart melting point apparatus. The test item was visually inspected while increasing the temperature.

 

At a temperature of 164.2 °C the test item started to boil. At 173.3 °C the appearance of the test item changed to cloudy and greyish. At 229.0 °C the colour of the test item changed to white.

Combining the results of the measurements, the third endothermic effect in the DSC can be assigned to the boiling of the test item.

 

For the correction of the boiling temperature to normal pressure the test item was assigned to chemical group 2 (e.g. hydrocarbons). According to appendix 8.2 a correction value φ = 4.9 was used for a temperature of 170 °C.

 

The lowest measured onset temperature is corrected to the normal pressure to be 173.72 °C and the highest onset temperature to be 173.93 °C. The corrected temperatures of the boiling point differ by less than 0.5 K from their mean value of 173.83°C. Thus, the test item has a boiling point under atmospheric pressure (1013 hPa) of 173.8 °C. The last endothermic effect in the DSC may be caused by the evaporation of the test item.

 

Conclusions:

The boiling point of the test item was determined to be 173.8 °C at 1013.25 hPa.

Executive summary:

A study was conducted according to OECD test guideline 103, Regulation (EC) No 440/2008 method A.2 and EPA OCSPP test guideline 830.7220 to determine the boiling point of the test item using differential scanning calorimetry. The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen).Two tests with about 11 – 16 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. Three endothermic effects were observed, which can’t be clearly assigned to a boiling of the test item. Thus, the test item was additionally investigated by means of the capillary method. At a temperature of 164.2 °C the test item started to boil. At 173.3 °C the appearance of the test item changed to cloudy and greyish. At 229.0 °C the colour of the test item changed to white. Combining the results of the measurements, the third endothermic effect in the DSC can be assigned to the boiling of the test item. The lowest measured onset temperature is corrected to the normal pressure to be 173.72 °C and the highest onset temperature to be 173.93 °C. The corrected temperatures of the boiling point differ by less than 0.5 K from their mean value of 173.83°C. Thus, the boiling point under atmospheric pressure (1013 hPa) was determined to be 173.8 °C.

 

Description of key information

The boiling point of the substance under atmospheric pressure (1013 hPa) was determined to be 173.8 °C.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

173.8 °C

Additional information

A study was conducted according to OECD test guideline 103, Regulation (EC) No 440/2008 method A.2 and EPA OCSPP test guideline 830.7220 to determine the boiling point of the test item using differential scanning calorimetry. The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen).Two tests with about 11 – 16 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. Three endothermic effects were observed, which can’t be clearly assigned to a boiling of the test item. Thus, the test item was additionally investigated by means of the capillary method. At a temperature of 164.2 °C the test item started to boil. At 173.3 °C the appearance of the test item changed to cloudy and greyish. At 229.0 °C the colour of the test item changed to white. Combining the results of the measurements, the third endothermic effect in the DSC can be assigned to the boiling of the test item. The lowest measured onset temperature is corrected to the normal pressure to be 173.72 °C and the highest onset temperature to be 173.93 °C. The corrected temperatures of the boiling point differ by less than 0.5 K from their mean value of 173.83°C. Thus, the boiling point under atmospheric pressure (1013 hPa) was determined to be 173.8 °C.