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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:
weight of evidence
Study period:
1991-03-26 - 1991-03-27
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study with acceptable restriction

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1991
Report date:
1991

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
yes
Remarks:
: extrapolated over a wide temperature range
GLP compliance:
yes
Type of method:
dynamic method

Test material

Constituent 1
Chemical structure
Reference substance name:
Benzothiazole
EC Number:
202-396-2
EC Name:
Benzothiazole
Cas Number:
95-16-9
Molecular formula:
C7H5NS
IUPAC Name:
1,3-benzothiazole
Details on test material:
- Name of test material (as cited in study report): Benzothiazol
- Analytical purity: no data

Results and discussion

Vapour pressureopen allclose all
Temp.:
20 °C
Vapour pressure:
0.13 hPa
Remarks on result:
other: calculated by using the parameters of the regression equation
Temp.:
25 °C
Vapour pressure:
0.18 hPa
Remarks on result:
other: calculated by using the parameters of the regression equation
Temp.:
50 °C
Vapour pressure:
0.95 hPa
Remarks on result:
other: calculated by using the parameters of the regression equation
Temp.:
91.1 °C
Vapour pressure:
9 hPa
Remarks on result:
other: measured

Any other information on results incl. tables

1. test

regression equation:

ln(p) = -0.64503 * (1/T) * 10000 + 19.92830

correlation coefficient: 0.99900

2. test

regression equation:

ln(p) = -0.64114 * (1/T) * 10000 + 19.80942

correlation coefficient: 0.99986

Table 1: measured values

1. test

2. test

temperature t
[°C]

vapour pressure p
[mbar]

temperature t
[°C]

vapour pressure p
[mbar]

94.6

10.5

91.1

9.0

108.1

19.5

128.5

48.3

131.9

62.4

150.9

109.0

150.0

108.7

173.7

237.0

168.4

204.7

192.5

413.0

192.7

435.0

210.3

703.0

206.8

652.0

223.8

1017.0

222.8

1016.0

213.4

764.0

154.7

127.0

195.7

455.0

171.4

221.0

177.7

260.0

196.5

482.0

161.0

155.0

 

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 0.13 hPa at 20 °C. (Weber, Bayer 1991)