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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:
02 September 2015 - 04 September 2015
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. 136 Pa
Remarks on result:
other: First trial
Test no.:
#1
Temp.:
298.15 K
Vapour pressure:
ca. 172 Pa
Remarks on result:
other: First trial
Test no.:
#2
Temp.:
293.15 K
Vapour pressure:
ca. 151 Pa
Remarks on result:
other: Second trial
Test no.:
#2
Temp.:
298.15 K
Vapour pressure:
ca. 178 Pa
Remarks on result:
other: Second trial
Key result
Temp.:
293.15 K
Vapour pressure:
ca. 144 Pa
Remarks on result:
other: Mean
Key result
Temp.:
298.15 K
Vapour pressure:
ca. 175 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)

158

11:00

23.5

296.65

3.371E-03

2.199

178

12:20

25.6

298.75

3.347E-03

2.250

197

13:30

27.8

300.95

3.323E-03

2.294

216

14:37

30.0

303.15

3.299E-03

2.334

235

16:05

32.3

305.45

3.273858E-03

2,371

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              -1765.2 

Intercept          8.1552 

R²                   0.9943

 

The results obtained indicate the following vapour pressure relationship: 

Log10(p (Pa)) = -1765.2 / T (K) + 8.1552

 

The above equation yields a vapour pressure of 136 Pa at 293.15 K and 172 Pa at 298.15 K.

Second trial:

Vapour Pressure (Pa)

Time (hh:mn)

Corresponding Temperature (°C)

Temperature (K)

1/T (K-1)

Log10(p)

170

10:45

23.3

296.45

3.373E-03

2.230

178

12:05

25.5

298.65

3.348E-03

2.250

194

13:30

27.8

300.95

3.323E-03

2.288

209

14:50

30.0

303.15

3.299E-03

2.320

223

16:10

32.3

305.45

3.274E-03

2.348

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              -1229.1

Intercept          6.3724 

R²                   0.9932

 

The results obtained indicate the following vapour pressure relationship:

Log10(p (Pa)) = -1229.1/ T (K) + 6.3724

 

The above equation yields a vapour pressure of 151 Pa at 293.15 K and 178 Pa at 298.15 K.

Conclusions:
The vapour pressure of REACTION MASS OF BETA-PHELLANDRENE AND D-LIMONENE AND L-LIMONENE is 144 Pa at 20°C and 175 Pa at 25°C.
Executive summary:

A study was performed to determine the vapour pressure of test item REACTION MASS OF BETA-PHELLANDRENE AND D-LIMONENE AND L-LIMONENE. The method followed was designed to be compliant with the OECD Guideline for Testing of Chemicals No. 104, "Vapour Pressure", adopted in March, 2006 and Regulation (EC) No 761/2009, EC A4, 23 July 2009.

In this analytical method, the vapour pressure of the test item at thermodynamic equilibrium was determined at various specified temperatures (from 24 to 32°C).

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 of 20°C and 25°C.

Two trials were conducted and five points were recorded for each trial.

Log10 (Vapour Pressure (Pa)) was plotted against reciprocal temperature and values of vapour pressure were calculated at 20°C and 25°C with the linear function parameters (slope and intercept).

These values respect validity criteria (less than 20% of difference) and the linear functions obtained own a correlation coefficient R² over 0.95.

Moreover the calculated values showed good correspondence with the experimentally determined ones.

In conclusion, the vapour pressure of REACTION MASS OF BETA-PHELLANDRENE AND D-LIMONENE AND L-LIMONENE is 144 Pa at 20°C and 175 Pa at 25°C.

Description of key information

The vapour pressure of Reaction mass of beta-phellandrene and d-limonene and l-limonene was calculated using the static method: 144 Pa at 20°C and 175 Pa at 25°C.

Key value for chemical safety assessment

Vapour pressure:
200 Pa
at the temperature of:
25 °C

Additional information

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

The key value used for chemical safety assessment is the vapour pressure of d-limonene, one of the main constituents of the registered substance.