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Vapour pressure

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vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Composition 0
Principles of method if other than guideline:
Principle of test:
Allyl Isothiocyanate vapour pressure was measured using the transpiration method.

Short description of test conditions:
Ca. 3 ml of Allyl Isothiocyanate was dispensed into the receptacle of the transpiration measurement device. Dry nitrogen gas or nitrogen gas of 80% relative humidity was introduced into the receptacle at a constant flow rate and Allyl Isothiocyanate vapor was guided into a trap cooled with liquid nitrogen.
The trap was removed after a fixed period of time and the liquefied Allyl Isothiocyanate was diluted homogeneously with 2 ml di acetone. This test solution was analysed by Gas Chromatography and the volume of Allyl Isothiocyanate trapped was determined using a calibration curve prepared beforehand. Measurement was performed three times at 0% relative humidity and twice at 80%.

Parameters analysed / observed:
Vapour pressure of Allyl Isothiocyanate at relative humidities of 0% and 80%.
GLP compliance:
not specified
Type of method:
other: transpiration method
Test material information:
Composition 1
Specific details on test material used for the study:
Test item purity 99.9%
Test no.:
23 °C
Vapour pressure:
3.4 mm Hg
Vapor pressure of Allyl Isothiocyanate is 3.4 mmHg at 23°C.

Description of key information

Key value for chemical safety assessment

Vapour pressure:
0.453 kPa
at the temperature of:
23 °C

Additional information