2-isopropyl-N-hydroxyethyl 1,3-oxazolidine;methyl carbonato-N-ethyl-2-isopropyl-1,3-oxazolidine;reaction mass of: carbonato-bis-N-ethyl-2-isopropyl-1,3-oxazolidine

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 2020-10-20 to 2020-11-20

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Version / remarks:

23.03.2006

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Version / remarks:

24.08.2009

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: Knudsen cell

Temp.:

20 °C

Vapour pressure:

0.002 Pa

Remarks on result:

other: Molecular weight 344.4 g/mol

Temp.:

25 °C

Vapour pressure:

0.004 Pa

Remarks on result:

other: Molecular weight 344.4 g/mol

Key result

Temp.:

20 °C

Vapour pressure:

0.003 Pa

Remarks on result:

other: Molecular weight 217.3 g/mol

Temp.:

25 °C

Vapour pressure:

0.004 Pa

Remarks on result:

other: Molecular weight 217.3 g/mol

The vapour pressure was calculated using the following equation:

p = m/(K A t) √([2 π R T] / M)

with

Parameter	Explanation	Source/Value
p	vapour pressure in Pa	to be calculated
m	weight loss in kg	experimental value
t	time in s	experimental value
A	area of aperture in m^2	17.85 * 10^-7m^2 (for d = 1mm)
K	correction factor	0.909
R	universal gas constant in J/mol*K	8.314472
T	temperature in K	experimental value
M	molecular weight in kg/mol	0.2173 – 0.3444

 

As the substance consists of two constituents with different molecular weights, the vapour pressure was calculated for both of them.

 

Calculation Results for the molecular mass of 217.3 g/mol

T	Mean p	1/T	log p
K	Pa	1/K	log Pa
333.2	9.50E-02	3.0012E-03	-1.0225
348.2	2.71E-01	2.8719E-03	-0.5676
363.2	8.09E-01	2.7533E-03	-0.0919

 

A graph with log p vs. 1/T was plotted. Since the values were correlated by a linear relation, the data could be fitted by linear regression. The parameter of the linear regression are given in the next table.

Parameter	Value
Slope	-3750.1
Intercept	10.2228
Correlation Coefficient r	-0.9993
Coefficient of Determination r^2	0.9986

 

Calculation Results for the molecular mass of 334.4 g/mol

T	Mean p	1/T	log p
K	Pa	1/K	log Pa
333.2	7.54E-02	3.0012E-03	-1.1225
348.2	2.15E-01	2.8719E-03	-0.6676
363.2	6.43E-01	2.7533E-03	-0.1919

A graph with log p vs. 1/T was plotted. Since the values were correlated by a linear relation, the data could be fitted by linear regression. The parameter of the linear regression are given in the next table.

Parameter	Value
Slope	-3750.1
Intercept	10.1228
Correlation Coefficient r	-0.9993
Coefficient of Determination r^2	0.9986

Conclusions:

The vapour pressure of the test item at 20 °C was determined to be 0.00269 Pa.

Executive summary:

An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC), Method A.4 and OECD 104 using the effusion method (weight loss). The vapour pressure was determined at three different temperatures (60, 75 and 90 °C). As the test item consists of two constituents with different molecular weights, the vapour pressure was calculated for both of them. The determined log p values were plotted against 1/T. The vapour pressure at 20 and 25 °C was extrapolated from the linear regression. For a molecular weight of 217.3 g/mol the vapour pressure of the test item at 20 and 25 °C was determined to be 0.00269 and 0.00441 Pa, respectively. For a molecular weight of 334.4 g/mol the vapour pressure of the test item at 20 and 25 °C was determined to be 0.00214 and 0.00351 Pa, respectively. As key value for the chemical safety assessment the higher value of the smaller molecule, 0.00269 Pa at 20 °C, is used as worst case approach.

Reference 2

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

disregarded due to major methodological deficiencies

Study period:

1998

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Version / remarks:

cited as: Directive 92/69/EEC, A4 dated 29 Dec 1992

Deviations:

no

GLP compliance:

yes

Type of method:

effusion method: vapour pressure balance

Key result

Temp.:

25 °C

Vapour pressure:

0.17 Pa

Remarks on result:

other: Estimated vapour pressure value.

The results are taken from extrapolation from the temperature range 18 °C - 34 °C.

Conclusions:

The vapour pressure was determined to be 0.17 Pa at 25 °C.

Executive summary:

A study was conducted according to Directive 92/69/EEC Method A.4 to determine the vapour pressure of the test item Incozol LV. The vapour pressure was determined to be 0.17 Pa at 25 °C.

Description of key information

The vapour pressure of the test item at 20 °C was determined to be 0.00269 Pa.

 

Key value for chemical safety assessment

Vapour pressure:

0.003 Pa

at the temperature of:

20 °C

Additional information

An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC), Method A.4 and OECD 104 using the effusion method (weight loss). The vapour pressure was determined at three different temperatures (60, 75 and 90 °C). As the test item consists of two constituents with different molecular weights, the vapour pressure was calculated for both of them. The determined log p values were plotted against 1/T. The vapour pressure at 20 and 25 °C was extrapolated from the linear regression. For a molecular weight of 217.3 g/mol the vapour pressure of the test item at 20 and 25 °C was determined to be 0.00269 and 0.00441 Pa, respectively. For a molecular weight of 334.4 g/mol the vapour pressure of the test item at 20 and 25 °C was determined to be 0.00214 and 0.00351 Pa, respectively. As key value for the chemical safety assessment the higher value of the smaller molecule, 0.00269 Pa at 20 °C, is used as worst case approach.