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Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

25 November 2012 to 8 March 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Version / remarks:

2006

GLP compliance:

no

Other quality assurance:

ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)

Type of method:

dynamic method

Key result

Temp.:

20 °C

Vapour pressure:

4.69 Pa

Temp.:

25 °C

Vapour pressure:

7.06 Pa

Temp.:

50 °C

Vapour pressure:

250.36 Pa

Transition / decomposition:

no

Remarks:

Reaction and/or decomposition of the test material was not observed during the test.

The vapour pressure was measured in the temperature range of 77 °C to 148 °C. As a check, some points were repeated at decreasing pressures. The measured values together with the measured temperatures are listed in the following table.

 

Measurement results of vapour pressure at various temperature.

Sample name	Temperature		Vapour pressure		Condition
	°C	K	Pa	mmHg
Test substance	77	350	267	2	measured up
	102	375	933	7	measured up
	113	386	1733	13	measured up
	120	393	2333	18	measured up
	132	405	4000	30	measured up
	136	409	5333	40	measured up
	148	421	7133	54	measured up
	143	416	6533	49	measured down
	135	408	4666	35	measured down
	128	401	3466	26	measured down
	118	391	2066	16	measured down
	108	381	1333	10	measured down
	92	365	533	4	measured down

 

From the measured data points of the vapour pressure curve, the constants A and B of the Antoine equation were calculated.

 

Antoine equation: Log P= A+ B*1/(T)

P : Vapour pressure in Pa

T : Temperature in K

A= 11.28

B= -3108.5

 

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 °C, 25 °C and 50 °C as shown in the following table.

 

Sample name	Temperature		Vapour pressure
	°C	K	Pa	mmHg
Test substance	20	293	4.69	3.5E-2
	25	298	7.06	5.3E-2
	50	323	250.36	3.4E-1

 

Conclusion

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 °C (293 K), 25 °C (298 K) and 50 °C (323 K). The resulting vapour pressures are 4.69 Pa, 7.06 Pa and 250.36 Pa, respectively. Reaction and/or decomposition of the test material was not observed during the test.

Conclusions:

Vapour pressure values of 4.69 Pa (at 20 °C), 7.06 Pa (at 25 °C) and 250.36 Pa (at 50 °C) were determined for the test substance according to OECD guideline 104.

Description of key information

Vapour pressure: 4.69 Pa at 20 °C, 7.06 Pa at 25 °C, 250.36 Pa at 50 °C (OECD guideline 104, dynamic method)

Key value for chemical safety assessment

Vapour pressure:

4.69 Pa

at the temperature of:

20 °C

Additional information

According to Regulation EC No. 440/2008 Method A.4, the vapour pressure values of the test item for the temperatures 20, 25 and 50 °C were calculated by extrapolation of the measured vapour pressure curve.