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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2012-04-16 to 2012-04-17
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline 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
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
Qualifier:
equivalent or similar to guideline
Guideline:
other: Etzweiler F, Senn E, Neuner-Jehle, Bunsen-Ges B, Phys Chem. 1984 88:578-583
Qualifier:
equivalent or similar to guideline
Guideline:
other: Neuner-Jahle N, Etzweiler F. Perfumes: Art, Science and Technology; in Muller P, Lamparsky (eds) Elsevier Applied Science Publishers, London, 1991 153-212.
GLP compliance:
yes (incl. QA statement)
Type of method:
gas saturation method
Specific details on test material used for the study:
- Names of test material (as cited in study report): Aldehyde C10 decyclic food grade
- Substance type: Colourless liquid
- Physical state: Liquid
- Impurities (identity and concentrations): No data
- Composition of test material, percentage of components:
- Isomers composition: No data
- Purity test date: No data
- Lot No: VE00152125
- Expiration date of the lot/batch: 2012-04-19
- Stability under test conditions: No data
- Storage condition of test material: No data
Temp.:
20 °C
Vapour pressure:
8.2 Pa
Transition / decomposition:
no

Headspace vapour concentrations of the test material as found after different equilibration times are exposed below:

Equilibration times (h) Headspace concentration (g.m-3)
3 0.582
5 0.446
7 0.541
Average 0.523

The results were in agremeent within the estimated repeatability of the method as stated in the OECD 104 guideline for the method.

An additional peak was observed on the chromatograms of the test samples at a retention time of 11.557 mins, likely due to the oxidation of the test material under test conditions. Since the test material was present in a large excess on the bottom of the headspace vessel, this small loss due to oxidation was not regarded as critical. The validity of the study was not adversely affected.

Calculation of vapour pressure

The vapour pressure is calculated using the following equation:

p = W ×R × T ÷ ( V × M)

Where:

p = Vapour pressure in Pascal (Pa)
W = Mass of the test substance in the aspirated volume (g)
V = Aspirated volume (i.e. volume of the burette) (m3)
R = Universal gas constant (8.314 J.mol-1.K-1)
T = Test temperature (K)
M = Molecular mass of the test substance (g.mol-1)

Using this calculation gave the result of 8.2 Pa at 20 °C.

Conclusions:
The vapour pressure of the test material was determined to be 8.2 Pa at 20 °C.

Description of key information

Vapour pressure 8.2 Pa at 20 °C (OECD 104)

Key value for chemical safety assessment

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

Additional information