Propylphosphonic acid

Boiling point

Administrative data

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Guideline and GLP-Study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling point/boiling range)

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Test material

Test material information

Constituent 1

Reference substance name:

Propylphosphonic acid

EC Number:

225-121-8

EC Name:

Propylphosphonic acid

Cas Number:

4672-38-2

Molecular formula:

C3H9O3P

IUPAC Name:

propylphosphonic acid

Results and discussion

Boiling point

Boiling pt.:

>= 421 - <= 423 °C

Atm. press.:

1 023 hPa

Decomposition:

no

Any other information on results incl. tables

In the table below all observed data of endothermic events are summarized. In none of the DSC tests exothermic events were detected. All data are reported with one decimals.

 

1^stEndothermic peak	Test 1	Test 2	Test 3
Onset [°C]	50.4	49.5	51.8
Peak Maximum [°C]	62.7	63.2	64.3
Endset [°C]	68.5	69.7	70.4
Int. norm. [J/g] (*)	38.7	40.5	33.3
2^ndEndothermic peak	Test 1	Test 2	Test 3
Onset [°C]	422.9	422.1	422.9
Pressure [kPa]	101.7	102.6	101.8

                  (*) = Normalized integral of peak area

 

The first endothermic peak in all tests are the melting of the test item. At approximately 422°C the second endothermic event is the boiling of the substance. During the three tests the atmospheric pressure was close (∆p < 1.5 kPa) to the standard pressure of 101.325 kPa, therefore no correction to normal pressure was necessary.

 

In test 2 a spike at approximately 200°C is visible. This effect was probably caused by a mechanical knock or abrupt vibration, but had no influence on the detection of the second endothermic peak. Therefore, this test was also used for the calculation of the average onset boiling temperature. In the table below the onset data and statistical calculations of the three determinations are summarized.

 

Boiling temperature	Test 1	Test 2	Test 3
Onset [°C]	422.9	422.1	422.9
Onset [K]	696.1	695.3	696.1
Average [°C]	422.6
Average [K]	695.8
Standard Deviation	0.46
Confidence Interval CI (P=95%, n=3)	1.14

 

Due to the high temperature area and the shape of the endothermic peak the temperature data were rounded to one decimal place and the confidence interval as well as the standard deviation were rounded to two decimals.

 

Boiling temperature (onset) of

1-Propanephosphonic acid:

 

422.6 ± 1.14°C

(695.8 ± 1.14 K)