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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
September 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study conducted according to OECD 104 and EU A.4 guidelines, under GLP without deviation and with certificate of analysis included.
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
2015-03-05
Type of method:
static method
Test no.:
#1
Temp.:
293.15 K
Vapour pressure:
ca. 567 Pa
Remarks on result:
other: First trial
Test no.:
#1
Temp.:
298.15 K
Vapour pressure:
ca. 679 Pa
Remarks on result:
other: First trial
Test no.:
#2
Temp.:
293.15 K
Vapour pressure:
ca. 558 Pa
Remarks on result:
other: Second trial
Test no.:
#2
Temp.:
298.15 K
Vapour pressure:
ca. 624 Pa
Remarks on result:
other: Second trial
Key result
Temp.:
293.15 K
Vapour pressure:
ca. 563 Pa
Remarks on result:
other: Mean
Key result
Temp.:
298.15 K
Vapour pressure:
ca. 652 Pa
Remarks on result:
other: Mean

First trial:

 

Vapour Pressure (Pa)

Time (hh:mn)

Corresponding Temperature (°C)

Temperature (K)

1/T (K-1)

Log10(p)

650

14:35 (21/09/16)

23.6

296,75

3,370E-03

2,813

705

10:30

25.9

299,05

3,344E-03

2,848

740

15:00

28.0

301,15

3,321E-03

2,869

810

16:40

30.3

303,45

3,295E-03

2,908

890

18:00

32,5

305,65

3,272E-03

2,949

 

A plot of Log10(p) versus temperature (1/T) (with p in Pa and T in K) gives the following statistical data using an unweighted least square treatment.

 

Slope              -1361.7

 

Intercept          7.3988

 

R²                   0.9894

 

The results obtained indicate the following vapour pressure relationship:

 

Log10(p (Pa)) = -1361.7 / T (K) + 7.3988

 

The above equation yields a vapour pressure of 567 Pa at 293.15 K and 679 Pa at 298.15 K.

Second trial:

 

Vapour Pressure (Pa)

Time (hh:mn)

Corresponding Temperature (°C)

Temperature (K)

1/T (K-1)

Log10(p)

610

10:40

23,6

296.75

3,370E-03

2,785

633

12:00

25,8

298.95

3,345E-03

2,801

662

14:00

28

301.15

3,321E-03

2,821

699

15:20

30.3

303.45

3,295E-03

2,844

742

16:40

32,6

305.75

3,271E-03

2,870

 

A plot of Log10(p ) versus reciprocal temperature (1/T) (with p in Pa and T in K) gives the following statistical data using an unweighted least square treatment.

 

Slope              -859.99

 

Intercept          5.6799

 

R²                   0.9916

 

The results obtained indicate the following vapour pressure relationship:

 

Log10(p (Pa)) = -859.99 / T(K) + 5.6799

 

The above equation yields a vapour pressure of 558 Pa at 293.15 K and 624 Pa at 298.15 K.

Conclusions:
Using the static method according to guideline OECD 104 and method EU A.4, vapour pressure of 563 Pa at 20°C and 652 Pa at 25°C were estimated for the test item.
Executive summary:

Vapour pressure of (-)-alpha-pinene was measured using the static method according to guideline OECD 104 and method EU A.4.

The Log10(Vapour Pressure (Pa)) was plotted against 1/T (K) and a linear function was obtained. With this equation, the vapour pressure has been calculated for temperatures at 20°C and 25°C.

The vapour pressure of the test item was calculated as 563 Pa at 20°C and 652 Pa at 25°C.

Based on the correlation coefficient R² over 0.95 and on the difference between the two determinations at each temperature (< 20%), the study is considered as valid.

Description of key information

Vapour pressure of (-)-alpha-pinene was calculated using the static method:  563 Pa at 20°C and 652 Pa at 25°C

Key value for chemical safety assessment

Vapour pressure:
563 Pa
at the temperature of:
20 °C

Additional information

A study was conducted according to Guideline OECD 104 and method EU A.4 to measure the vapour pressure of (-)-alpha-pinene. As the results were obtained under GLP without deviation, they were considered as valid and reliable without restriction and used as key value.

This result is supported by consistent experimental data obtained with alpha-pinene multiconstituent.