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Physical & Chemical properties

Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2009-05-11
Reliability:
1 (reliable without restriction)
Qualifier:
according to guideline
Guideline:
other: NFT 20-048
GLP compliance:
no
Type of method:
static method
Temp.:
ca. 20 °C
Vapour pressure:
< 5 Pa
Temp.:
ca. 50 °C
Vapour pressure:
15 Pa
Executive summary:

 Measurement  1  2
 Temperature in °C  20.0  50.0
 Vapour Pressure in Pa  < 5  15
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Value obtained from a recognised source of physico-chemical data. This reference is considered as definitive for vapour pressure values.
Principles of method if other than guideline:
No details are available on the guideline used to determine this result.
GLP compliance:
not specified
Temp.:
25 °C
Vapour pressure:
0.011 hPa
Conclusions:
A vapour pressure value of 0.0113 hPa at 25ºC is reported in a collection of reliable data which has been subject to peer-review. The result is considered to be reliable.

Description of key information

The vapour pressure of a commercial decan-1-ol product is <5 Pa at 20°C, supported by literature data and QSAR. A consistent and reliable measurement of 1.13 Pa at 25°C using a highly pure sample is available (Daubert and Danner, 1989).

The quantified value at ambient temperature from Daubert and Danner is used in environmental modelling. This value is useful particularly in view that the key study result is a limit value.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of <5 Pa at 20°C was determined in a reliable study.

It is supported by a value of 0.433 Pa at 25°C for a pure product, taken from a reliable reference source (Boublik et al., 1984), and a consistent structure-based prediction made using the MPBPVP software from EPI Web 4.0 (2009). A value of ca. 15 Pa was measured at elevated temperature for another commercial product, of higher purity. A consistent and reliable measurement of 1.13 Pa at 25°C using a highly pure sample is available (Daubert and Danner, 1989).

The quantified value at ambient temperature from Daubert and Danner is used in environmental modelling.

Discussion of trends in the Category of C6-24 linear and essentially-linear aliphatic alcohols:

As chain length increases, vapour pressure decreases. This is because molecular weight is higher and intermolecular forces in the substance are all higher.