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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:
September 2010
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:
reference to same study
Reason / purpose:
reference to other study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
static method
Temp.:
20 °C
Vapour pressure:
300 Pa
Key result
Temp.:
25 °C
Vapour pressure:
381 Pa

The vapour pressure of the test item TERPINEOL MULTICONSTITUENT was calculated as 300 Pa at 20.0°C and 381 Pa at 25.0°C. These values were calculated from the linear regression parameters of 17 individual measurements. The calculation results are presented in the following table:

Calculated values for 1/T and log P

The parameters for the linear regression of the above graph are presented in the following table:

Linear Regression Parameters

Parameter

Value

Slope B

-1811.84

Intercept A

8.658

Correlation coefficient r

-0.9992

Using the equation log P = B*1/T + A, values of vapour pressure at 20 and 25 °C were calculated.

Conclusions:
Using the static method according to OECD 104 guideline and EU method A.4, vapour pressures of 300 Pa at 20°C and 381 Pa at 25°C were estimated for the test item.
Executive summary:

The vapour pressure of terpineol multiconstituent was measured using the static method according to OECD Guideline 104 and EU method A.4. Thanks to equation log P = B*1/T + A and the linear regression parameters of 17 individual measurements between 21.3 and 58.5 °C, the vapour pressure of the test item was calculated as 300 Pa at 20 °C and as 381 Pa at 25.0 °C.

The correlation coefficient r being -0.9992, the linear regression is good and the results are considered as valid. No observations were made which might cause doubts concerning the validity of the study outcome.

Description of key information

The vapour pressure of terpineol multiconstituent using the static method (calculated from the regression of 17 individual measurements) was estimated at:

- 300 Pa at 20°C
- 381 Pa at 25°C

Key value for chemical safety assessment

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

Additional information

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