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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:
10-Jun-2010 to 17-Aug-2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
no
Type of method:
gas saturation method
Temp.:
20 °C
Vapour pressure:
0.11 Pa
Temp.:
25 °C
Vapour pressure:
0.17 Pa
Remarks on result:
other: By interpolation
Temp.:
30 °C
Vapour pressure:
0.38 Pa
Temp.:
40 °C
Vapour pressure:
1.2 Pa
Transition / decomposition:
no

The experimental parameters for the performance of the vapor pressure determination are summarized in Table 1. The results and the amount of nitrogen used to calculate the vapor pressure of the individual experiments are summarized inTable 2. The tabulated values represent rounded results that were obtained by calculation using the exact raw data. To ensure saturation control, three different flow rates were used at each temperature. From Table 1 and Table 2 it can be clearly seen that higher flow rates did not lead to lower vapor pressures, which means that the nitrogen was saturated with test item under the conditions of the test.

 

Table 1       Experimental Parameters used for the Gas Saturation Method

Column

Temperature

Flow Rate

Collecting
Time

Volume

V1

No.

[°C]

[mLn/min]

[min]

[mLn]

1

21.40

40.80

5560.00

226848.00

2

50.80

282448.00

3

61.05

339438.00

1

31.25

39.95

1320.00

52734.00

2

50.75

66990.00

3

60.25

79530.00

1

41.00

41.25

821.00

33866.25

2

51.25

42076.25

3

60.65

49793.65

 

Table 2       Results of the Vapor Pressure Determination

Column No.

Temp.

Volume*
V2

Amount of test item in trap 1

Amount of test item in trap 2

Total amount of test item

Vapor pressure

Average vapor pressure

 

[°C]

[mL]

[µg]

[µg]

[µg]

[Pa]

[Pa]

1

21.40

244620

1184.224

5.289

1189.513

1.0 x 10-1

1.1 x 10-1

2

304576

1675.137

3.545

1678.682

1.1 x 10-1

3

366031

1812.603

4.890

1817.493

1.0 x 10-1

1

31.25

58767

1031.598

8.656

1040.255

3.8 x 10-1

3.8 x 10-1

2

74654

1474.273

8.438

1482.711

4.2 x 10-1

3

88629

1447.180

7.097

1454.277

3.5 x 10-1

1

41.00

38950

2193.008

4.979

2197.987

1.2 x 100

1.2 x 100

2

48392

2813.223

4.760

2817.982

1.3 x 100

3

57268

3135.433

4.889

3140.322

1.2 x 100

 

Conclusions:
Calculation of the vapor pressure of the substance at 25 °C by interpolation based upon the simplified Clausius-Clapeyron equation resulted in a vapor pressure of 1.7 x 10E-1 Pa at 25 °C.
Executive summary:

During this study, the vapor pressure of the test item CA3688A has been determined using the gas saturation method. The vapor pressure of the substance was measured at test temperatures of 20 °C, 30 °C and 40 °C and was determined to be 1.1 x 10-1Pa at 20 °C, 3.8 x 10-1Pa at 30 °C, 1.2 x 100Pa at 40 °C, and 1.7 x 10-1Pa at 25 °C (by interpolation).

Description of key information

0.17 Pa, 25°C, OECD 104, gas saturation, Weissenfeld 2010

Key value for chemical safety assessment

Vapour pressure:
0.17 Pa
at the temperature of:
25 °C

Additional information

A recent guideline study is available which is considered to be reliable and adequate for use in risk assessment, classification and labeling.