Benzyldimethylamine

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2013

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

Restrictions are considered as effusion/Knudsen cell method should preferably not be used above 1 Pa. The study is still considered as reliable because the actual measuring range (5-14 Pa) is not much above, and extrapolation from experimental temperatures (-20 to -10°C) to ambient is not much distant, but accuracy is expected to be lower than it would be in recommended test conditions.

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

GLP compliance:

no

Type of method:

effusion method: Knudsen cell

Temp.:

-19.77 °C

Vapour pressure:

>= 5.148 - <= 5.264 Pa

Temp.:

-14.75 °C

Vapour pressure:

>= 9.267 - <= 9.454 Pa

Temp.:

-9.82 °C

Vapour pressure:

>= 14.425 - <= 14.704 Pa

Key result

Temp.:

20 °C

Vapour pressure:

214 Pa

Remarks on result:

other: calculated from experimental values

Temp.:

25 °C

Vapour pressure:

317 Pa

Remarks on result:

other: calculated from experimental values

Temp.:

50 °C

Vapour pressure:

1 901 Pa

Remarks on result:

other: calculated from experimental values

Temp.:

55 °C

Vapour pressure:

2 632 Pa

Based on the experimental results, the vapour pressure ot the compound can be calculated for additional temperatures, between approx. -75°C and 45°C, through the following equation:

p/Pa= exp(-6903.1 /T/K + 28.912).

It is calculated as being equal to 214 Pa (2.14 mbar) at 20°C, and 317 Pa (3.17 mbar) at 25°C.

Executive summary:

The vapor pressure of the test item was measured using the Knudsen effusion method (mass-loss technique), according to the guidelines OECD 104 / EU A.4, non-GLP.

The quality of the apparatus was previously verified with the measurement of well-known reference compounds.

For the test item, experiments were performed at three temperatures between -19.77°C and -9.82°C. Measured vapour pressures, ranging between 5 and 14 Pa, were correlated to temperature.

From this equation, the vapor pressure of the compound is extrapolated to 214 Pa at 20°C, and 317 Pa at 25°C.

Description of key information

Benzyldimethylamine has an experimentally measured, extrapolated vapour pressure of 214 Pa at 20°C (OECD104, effusion with Knudsen cell method; Fonseca, 2013).

Low volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA: 0.01 - 500 Pa).

Key value for chemical safety assessment

Vapour pressure:

214 Pa

at the temperature of:

20 °C

Additional information

Three data sources were identified, but only (Fonseca, 2013) was considered as reliable. (Keldenich, 2010) was discarded as the equipment was considered not suitable. No sufficient details were available for (Neely, 1985).