Phenylphosphonic acid

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 October 2017 to 26 October 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: isothermal thermogravimetry

Test material

Test material information

Constituent 1

Reference substance name:

Phenylphosphonic acid

EC Number:

216-388-1

EC Name:

Phenylphosphonic acid

Cas Number:

1571-33-1

Molecular formula:

C6H7O3P

IUPAC Name:

phenylphosphonic acid

Test material form:

solid: particulate/powder

Details on test material:

Lot number LKF6065

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Sponsor and LKF6065
- Expiration date of the lot/batch: 09 December 2017
- Purity test date: 21 October 2016

Results and discussion

Vapour pressure

Vapour pressure 1

Key result

Test no.:

#1

Temp.:

20 °C

Vapour pressure:

< 0 Pa

Vapour pressure 2

Key result

Test no.:

#2

Temp.:

20 °C

Vapour pressure:

< 0 mm Hg

Vapour pressure 3

Key result

Test no.:

#3

Temp.:

25 °C

Vapour pressure:

< 0 Pa

Vapour pressure 4

Key result

Test no.:

#4

Temp.:

25 °C

Vapour pressure:

< 0 mm Hg

Any other information on results incl. tables

In the temperature range of 170°C and 190°C a log p versus 1/T curve for the test item could not be determined since the coefficient of correlation (r) was

< 0.99 (data is archived in the raw data). The observed weight losses were non-linear indicating reaction and/or decomposition of the test substance at these temperatures.

Since no accurate vapour pressure could be calculated from the obtained results, the weight losses of the test item were compared with the results of Chrysene at the same temperatures. The weight loss curve of this reference substance is shown in Figure 5. Since the weight loss of the test item was lower than the weight loss of the reference compound, the vapour pressure of the test item is considered to be below the vapour pressure of Chrysene. According to this the vapour pressure of the test item is given in table below:

Vapour pressure of the Test Item

	20°C		25°C
	[Pa]	[mm Hg]	[Pa]	[mm Hg]
Test item	< 8.4E-7	< 6.3E-9	< 6.6E-7	< 4.9E-9

Applicant's summary and conclusion

Conclusions:

The isothermal TGA effusion method was applied for the determination of the vapour pressure of Phenyl Phosphonic Acid.
The vapour pressure of the test item at 20°C (293K) was <8.4E-7 Pa and < 6.3E-9 mmHg and at 25°C (298K) was < 6.6E-7 and < 4.9E-9 mmHg.