Bis[2-[2-(1-methylethyl)-3-oxazolidinyl]ethyl] hexan-1,2-diylbiscarbamate

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2012-09-20 to 2013-02-16

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Version / remarks:

dated 30 May 2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Version / remarks:

adopted 23 Mar 2006

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7950 (Vapor Pressure)

Version / remarks:

dated August 1996

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: by loss of weight or by trapping vaporisate

Key result

Temp.:

20 °C

Vapour pressure:

0 Pa

Remarks on result:

other: The value was calculated from the regression equation.

Key result

Temp.:

25 °C

Vapour pressure:

0.001 Pa

Remarks on result:

other: The value was calculated from the regression equation.

Calculation of results

The vapour pressure was calculated using the following equation:

p=(m/KAt)*sqrt(2πRT/M)

with:

Parameter	Explanation	Source/Value
p	vapour pressure in Pa	to be calculated
m	weight loss in kg	value is divided by 1000
t	time in s	as given in tables
A	area of aperture in m^2	3.14 * 10^-6m^2
K	correction factor	0.952
R	universal gas constant in J/Mol*K	8.314472
T	temperature in K	as given in tables
M	molecular weight in kg/Mol	0.48664524

 

The correction factor is depending on the relation length/radius of the aperture of the Knudsen cell

Relation	0.1	0.2	0.4	0.5	0.6	0.8	1.0
K	0.952	0.909	0.834	0.801	0.771	0.718	0.672

With the chosen length of the aperture 0.1 mm and the chosen radius 1 mm, a relation of 0.1 was calculated, and a correction factor of 0.952 was chosen.

 

Calculation Results

 

Calculation Results Experiment 1

Experiment

1

Real Temperature in K

303.2

Real Temperature in °C

30.0

Date of Measurement

08.Feb.2013 09:05

09.Feb.2013 10:25

10.Feb.2013 13:35

Elapsed Time in s

74100

89100

96000

Parameter

Weight loss

to be used

Vapour pressure

Weight loss

to be used

Vapour pressure

Weight loss

to be used

Vapour pressure

Unit

g

yes/no

Pa

g

yes/no

Pa

g

yes/no

Pa

Knudsen-cell 1

0.00194

yes

1.58E-03

0.00190

yes

1.29E-03

0.00187

yes

1.18E-03

Knudsen-cell 2

0.00193

yes

1.57E-03

0.00190

yes

1.29E-03

0.00199

yes

1.25E-03

Knudsen-cell 3

0.00197

yes

1.60E-03

0.00193

yes

1.31E-03

0.00183

yes

1.15E-03

Knudsen-cell 4

0.00192

yes

1.56E-03

0.00196

yes

1.33E-03

0.00205

yes

1.29E-03

Mean

yes

1.58E-03

yes

1.30E-03

yes

1.22E-03

Standard deviation:

1.76E-05

1.94E-05

6.44E-05

Mean of measured values:

1.366E-03

Standard deviation:

1.900E-04

RSD:

13.9 %

 

Calculation Results Experiment 2

Experiment	2
Real Temperature in K	318.2
Real Temperature in °C	45.0
Date of Measurement	11.Feb.2013 10:25				12.Feb.2013 14:25			13.Feb.2013 10:55
Elapsed Time in s	72900				96900			71400
Parameter	Weight loss	to be used		Vapour pressure	Weight loss	to be used	Vapour pressure	Weight loss	to be used	Vapour pressure
Unit	g	yes/no		Pa	g	yes/no	Pa	g	yes/no	Pa
Knudsen-cell 1	0.00614	yes		5.20E-03	0.00680	yes	4.34E-03	0.00495	yes	4.28E-03
Knudsen-cell 2	0.00770	yes		6.53E-03	0.00845	yes	5.39E-03	0.00572	yes	4.95E-03
Knudsen-cell 3	0.00758	yes		6.43E-03	0.00842	yes	5.37E-03	0.00574	yes	4.97E-03
Knudsen-cell 4	0.00844	yes		7.15E-03	0.00905	yes	5.77E-03	0.00620	yes	5.37E-03
Mean		yes		6.33E-03		yes	5.22E-03		yes	4.89E-03
Standard deviation:				8.15E-04			6.15E-04			4.48E-04
Mean of measured values:				5.479E-03
Standard deviation:				7.530E-04	RSD:	13.7 %

 

Calculation Results Experiment 3

Experiment	3
Real Temperature in K	333.2
Real Temperature in °C	60.0
Date of Measurement	14.Feb.2013 12:40			15.Feb.2013 10:30			16.Feb.2013 08:52
Elapsed Time in s	90300			75900			78120
Parameter	Weight loss	to be used	Vapour pressure	Weight loss	to be used	Vapour pressure	Weight loss	to be used	Vapour pressure
Unit	g	yes/no	Pa	g	yes/no	Pa	g	yes/no	Pa
Knudsen-cell 1	0.02603	yes	1.82E-02	0.02434	yes	2.03E-02	0.02500	yes	2.02E-02
Knudsen-cell 2	0.02552	yes	1.79E-02	0.02491	yes	2.08E-02	0.02443	yes	1.98E-02
Knudsen-cell 3	0.02597	yes	1.82E-02	0.02411	yes	2.01E-02	0.02510	yes	2.03E-02
Knudsen-cell 4	0.02669	yes	1.87E-02	0.02317	yes	1.93E-02	0.02431	yes	1.97E-02
Mean		yes	1.82E-02		yes	2.01E-02		yes	2.00E-02
Standard deviation:			3.38E-04			6.04E-04			3.22E-04
Mean of measured values:			1.945E-02
Standard deviation:			1.046E-03	RSD:	5.4 %

 

The measured values for temperature and vapour pressure were evaluated as follows:

Evaluation of Calculated Values

Parameter	T	P	1/T	log P
Unit	K	Pa	1/K	log Pa
Values	303.2	1.37E-03	3.2982E-03	-2.8647
	318.2	5.48E-03	3.1427E-03	-2.2613
	333.2	1.95E-02	3.0012E-03	-1.7111

 

Parameters of Linear Regression

Parameter	Value
Slope	-3884.8
Intercept	9.9478
Correlation Coefficient r	-1.0000
Coefficient of Determination r^2	1.0000

 

The following vapour pressures were determined experimentally and considered as valid

 

Experimentally Determined Vapour Pressures

T	T	P	Stand. Dev. P	RSD P
°C	K	Pa	Pa	%
30.0	303.2	1.37E-03	1.90E-04	13.9%
45.0	318.2	5.48E-03	7.53E-04	13.7%
60.0	333.2	1.95E-02	1.05E-03	5.4%

 

Conclusions:

The vapour pressure of Incozol 4 was determined to be 0.000496 Pa at 20 °C and 0.000828 Pa at 25 °C, respectively.

Executive summary:

A study was conducted to determine the vapour pressure of Incozol 4 according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4. Using the effusion method (weight loss) the vapour pressure of the test item Incozol 4 was determined at three different temperatures (30, 45 and 60 °C). All temperatures were evaluated as they showed reproducible weight loss. Thus, the result of the test can be considered valid. For these temperatures, 1/T was plotted against log (P). The graph 1/T vs. log (P) showed a straight line with a correlation coefficient of – 1.0000. The vapour pressures at 20 °C and at 25 °C were calculated from the regression equation. The vapour pressure was calculated to be 0.000496 Pa at 20 °C and 0.000828 Pa at 25 °C, respectively.

Description of key information

The vapour pressure of Incozol 4 was determined to be 0.000496 Pa at 20 °C and 0.000828 Pa at 25 °C, respectively.

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

20 °C

Additional information

A study was conducted to determine the vapour pressure of Incozol 4 according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4. Using the effusion method (weight loss) the vapour pressure of the test item Incozol 4 was determined at three different temperatures (30, 45 and 60 °C). All temperatures were evaluated as they showed reproducible weight loss. Thus, the result of the test can be considered valid. For these temperatures, 1/T was plotted against log (P). The graph 1/T vs. log (P) showed a straight line with a correlation coefficient of – 1.0000. The vapour pressures at 20 °C and at 25 °C were calculated from the regression equation. The vapour pressure was calculated to be 0.000496 Pa at 20 °C and 0.000828 Pa at 25 °C, respectively. No observations were made which might cause doubts on the validity of the study outcome. Therefore, the result of the study is considered valid.