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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:
4/22/2000
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Remarks:
non-GLP
Reference:
Composition 0
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
no
Type of method:
dynamic method
Test material information:
Composition 1
Key result
Temp.:
24 °C
Vapour pressure:
22.6 Pa
Transition / decomposition:
no

The transpiration method is used to determine the VP for materials having 10-3Pa to 103Pa. The substance has a VP of 22.6 Pa and is within the domain of the model.

This method is highly accurate with a relative standard deviation of < 5%, based on triplicate measurements. The use of flow controlling sampling techniques allows for accurate measurements over many orders of magnitude of VP values under a variety of conditions.

Conclusions:
The vapour pressure of Herbacet # 1 was investigated using the Transpiration method equivalent to OECD TG 104, gas saturation method, in a reliable non-GLP study. This is a dynamic method and has recently been updated for use of low volatile substances. A precisely known volume of air is sampled through a trap containing the sorbent Tenax TA. The adsorbed compound is desorbed and eluted onto a GC column where it is identified and quantified using a calibration curve. The mass of analyte per unit volume collected is used to calculate the vapour pressure. The vapour pressure of the Herbacet # 1 was found to be 22.6Pa at 24°C.
Executive summary:

The vapour pressure of Herbacet # 1 was investigated using the Transpiration method equivalent to OECD TG 104, gas saturation method. The vapour pressure of the substance was found to be 22.6Pa at 24°C.

Description of key information

The vapour pressure of Herbacet # 1 was investigated using the Transpiration method equivalent to OECD TG 104, gas saturation method. The vapour pressure of the substance was found to be 22.6 Pa at 24°C.

Key value for chemical safety assessment

Vapour pressure:
22.6 Pa
at the temperature of:
24 °C

Additional information