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Physical & Chemical properties

Vapour pressure

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Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP - Guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2001
Report Date:
2001

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Cited as Directive 92/69/EEC, A.4
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
dynamic method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Dimethylphosphit
- Analytical purity: 99.8%

Results and discussion

Vapour pressureopen allclose all
Temp.:
20 °C
Vapour pressure:
1.35 hPa
Remarks on result:
other: calculated by using the regressed parameters of the Antoine-Equation
Temp.:
25 °C
Vapour pressure:
1.9 hPa
Remarks on result:
other: calculated by using the regressed parameters of the Antoine-Equation
Temp.:
50 °C
Vapour pressure:
8.99 hPa
Remarks on result:
other: calculated by using the regressed parameters of the Antoine-Equation
Temp.:
24.88 °C
Vapour pressure:
1.89 hPa
Remarks on result:
other: calculated by using the regressed parameters of the Antoine-Equation
Temp.:
170.51 °C
Vapour pressure:
1 050.81 hPa
Remarks on result:
other: calculated by using the regressed parameters of the Antoine-Equation

Any other information on results incl. tables

Parameters of Antoine-Equation:

A = 7.8264

B = 1924.4

C = 230 (fixed)

Interpolation range: Tm < T < 170.5 °C (Tm = Melting Point [°C])

Mean Deviation = 4.89%

Table 1. Data

temperature [V]

temperature [°C]

temperature [1/K*10000]

p
 [hPa]

regression [hPa]

deviation [¿p/p*100%]

0.25285

24.88

33.6

1.8

1.9

4.7

0.46258

45.86

31.3

7.9

7.1

-11.5

0.83437

82.96

28.1

50.8

47.6

-6.8

1.116145

111.02

26.0

158.3

152.5

-3.8

1.3135

130.66

24.8

312.8

309.5

-1.1

1.53463

152.65

23.5

624.1

627.1

0.5

1.71416

170.51

22.5

1005.2

1050.9

4.3

0.272065

26.81

33.3

1.9

2.2

11.7

0.31951

31.55

32.8

3.0

2.9

-1.9

0.384505

38.06

32.1

4.8

4.4

-8.1

0.73954

73.51

28.8

31.6

30.6

-3.2

1.20794

120.16

25.4

210.3

214.1

1.8

1.413195

140.58

24.2

412.1

429.9

4.1

Applicant's summary and conclusion

Executive summary:

Vapour pressure of dimethyl phosphonate was determined according to EU Method A.4 (dynamic methond). The vapour pressure is 1.35 hPa at 20 °C. (Olf, Bayer AG, 2001)