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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
calculation (if not (Q)SAR)
Remarks:
Estimated by calculation
Adequacy of study:
key study
Study period:
2010
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The data was obtained using an appropriate estimation method
Qualifier:
no guideline followed
Principles of method if other than guideline:
The vapour pressure of each constituent of the UVCB submission substance was calculated using MPBPWIN v 1.43 (ref). The vapour pressure of the whole substance was calculated by multiplying the mole fraction of each constituent by its vapour pressure and summing the result.
GLP compliance:
no
Remarks:
Estimated by calculation
Type of method:
other: Estimated by calculation
Key result
Temp.:
25 °C
Vapour pressure:
0.004 Pa
Conclusions:
A vapour pressure value of 0.0038 Pa was obtained for the substance using an appropriate estimated method. The result is considered reliable.

Description of key information

Vapour pressure: 0.00385 Pa obtained by estimation

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the whole substance was determined by calculation. The mole fraction of each constituents of Distilled Tall Oil was multiplied by its vapour pressure. The result obtained was summed together to obtained the predicted total vapour pressure of the substance.

DTO is a UVCB substance and predicted vapour pressure for the whole substance is preferred for human health assessment purpose while the vapour pressure of individual constituents is used for environmental risk characterisation. A calculated vapour pressure of 0.00385 Pa was obtained for the whole substance.

Individual samples could have higher vapour pressure if any unexpected impurities are present.

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