Phosphoric acid, butyl 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:

2018-02-22 to 2018-03-20

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Boiling pt.:

>= 111 - <= 113 °C

Atm. press.:

>= 980 - <= 1 007 Pa

Decomposition:

yes

Decomp. temp.:

> 300 °C

Melting and Boiling Point (DSC and Capillary Method)

 

 

In the temperature ranges of -70 - 30 °C, 60 - 210 °C, 220 – 320 °C and 370 - 410 °C, four and five, respectively, 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
PN15006	16.74	-23.96 113.27 169.67 220.33 382.31	30 – 80 (endo) 110 – 180 (endo) 190 – 250 (endo) 300 – 350 (exo) 350 – >500 (exo)	11.13	1006.6
PN15108	10.92	-28.93 111.05 225.34 377.86	-70 – 30 (endo) 70 – 210 (endo) 220 – 320 (endo) 370 – 410 (endo)	7.23	979.8

During the cooling phase, no thermic effect could be observed in the DSC-measurements. During the subsequent heating phase four and five, respectively, broad endothermic effects were observed, which can’t be clearly assigned to a melting or boiling of the test item. Thus, the test item was additionally investigated in a test tube.

During the warming up, it could be observed that the test item melted at a temperature of 7.6 °C and boiled at 112.7 °C. At 121.3 °C the test item evaporated. The measurement was stopped at 143.2 °C.

The second endothermic signal in the temperature range of 60 to 210 °C can be assigned to the boiling of the test item. The visual observed boiling of the test item in the test tube was in good correlation with the onset temperatures of the DSC-measurements. As the onset temperatures in both tests deviate by more than 0.5 K from their mean value of 112.16 °C, the test item has a boiling range of 111 to 113 °C.

 

Conclusions:

The boiling point of the substance was determined to be in range of 111 - 113 °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 – 17 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. At ambient conditions, the test item is a paste. Therefore, the tests were started at ambient. The crucibles were cooled down to approx. -80 K at a constant cooling rate of 0.25 K/min. Subsequently, the temperature was increased up to 500 °C at a constant heating rate of 10 K/min under an inert atmosphere.During the cooling phase, no thermic effect could be observed in the DSC-measurements. During the subsequent heating phase four and five, respectively, broad endothermic effects were observed, which can’t be clearly assigned to a melting or boiling of the test item. Thus, the test item was additionally investigated in a test tube.During the warming up, it could be observed that the test item melted at a temperature of 7.6 °C and boiled at 112.7 °C. At 121.3 °C the test item evaporated. The measurement was stopped at 143.2 °C. The visual observed boiling of the test item in the test tube was in good correlation with the onset temperatures of the DSC-measurements. As the onset temperatures in both tests deviate by more than 0.5 K from their mean value of 112.16 °C, the test item has a boiling range of 111 to 113 °C. The boiling point of the substance was determined to be in range of 111 - 113 °C at 1013.25 hPa.

Description of key information

The boiling point of the substance was determined to be in range of 111 - 113 °C at 1013.25 hPa.

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 – 17 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. At ambient conditions, the test item is a paste. Therefore, the tests were started at ambient. The crucibles were cooled down to approx. -80 K at a constant cooling rate of 0.25 K/min. Subsequently, the temperature was increased up to 500 °C at a constant heating rate of 10 K/min under an inert atmosphere.During the cooling phase, no thermic effect could be observed in the DSC-measurements. During the subsequent heating phase four and five, respectively, broad endothermic effects were observed, which can’t be clearly assigned to a melting or boiling of the test item. Thus, the test item was additionally investigated in a test tube.During the warming up, it could be observed that the test item melted at a temperature of 7.6 °C and boiled at 112.7 °C. At 121.3 °C the test item evaporated. The measurement was stopped at 143.2 °C. The visual observed boiling of the test item in the test tube was in good correlation with the onset temperatures of the DSC-measurements. As the onset temperatures in both tests deviate by more than 0.5 K from their mean value of 112.16 °C, the test item has a boiling range of 111 to 113 °C. The boiling point of the substance was determined to be in range of 111 - 113 °C at 1013.25 hPa.