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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:
28 September 2010 to 20 January 2011
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Remarks:
The study was conducted according to an internationally recognised method, and under GLP. No deviation affected the quality of the study. The substance is adequately identified, but details on composition are missing. Therefore validation applies with restrictions.
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
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Remarks:
11 April 2011
Type of method:
static method
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
68 Pa
Key result
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
85 Pa

Table 4.6/1: Calculated values for 1/T and log P

 

n

T (°C)

P (mbar = hPa)

T (K)

1/T

1/K

log P

log Pa

1

18.0

0.6

291.15

0.00343466

1.7782

2

20.0

0.7

293.15

0.00341122

1.8451

3

25.0

0.8

298.15

0.00335402

1.9031

4

32.6

1.1

305.75

0.00327065

2.0414

5

40.0

1.4

313.15

0.00319336

2.1461

6

47.1

1.9

320.25

0.00312256

2.2788

7

55.8

2.5

328.95

0.00303998

2.3979

8

64.0

3.5

337.15

0.00296604

2.5441

9

73.9

5.0

347.05

0.00288143

2.6990

10

79.0

6.2

352.15

0.00283970

2.7924

11

71.0

4.8

344.15

0.00290571

2.6812

12

65.0

3.9

338.15

0.00295727

2.5911

13

56.0

2.8

329.15

0.00303813

2.4472

14

46.0

2.1

319.15

0.00313332

2.3222

15

37.0

1.4

310.15

0.00322425

2.1461

16

27.5

1.0

300.65

0.00332613

2.0000

17

18.1

0.7

291.25

0.00343348

1.8451

 

 

A graph with log VP vs. 1/T was plotted. Since the values were correlated by a linear relation, the data could be fitted by linear regression:

Slope = -1635.340619

Intercept = 7.411867677

Correlation Coefficient r = -0.996623393

The vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:

Vapour pressure at 20 °C = 68 Pa

Vapour pressure at 25 °C = 85 Pa

Conclusions:
Low volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA), < 500 Pa).
Executive summary:

The vapour pressure of the test substance was measured under GLP according to OECD 104 / EU A4 guideline, static method.

 

A total of 17 measurements were recorded between 18 and 79°C, with both increasing and decreasing temperature.

 

The vapour pressure of the test item was interpolated from the regression, as 68 Pa at 20 °C and 85 Pa at 25 °C.

Description of key information

Low volatility.

Key value for chemical safety assessment

Vapour pressure:
68 Pa
at the temperature of:
20 °C

Additional information

A reliable experimental study, conducted according to a recognized EC method and under GLP, is available.

Despite minor restrictions due to incomplete test item identification, it is considered as a key study, and the result is retained as key data.