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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:
key study
Study period:
2012-10-15 to 2013-01-09
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report date:
2013

Materials and methods

Test guidelineopen allclose all
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:
effusion method: vapour pressure balance

Test material

Constituent 1
Chemical structure
Reference substance name:
2-[[(4-methoxyphenyl)methylhydrazono]methyl]-1,3,3-trimethyl-3H-indolium methyl sulphate
EC Number:
258-946-7
EC Name:
2-[[(4-methoxyphenyl)methylhydrazono]methyl]-1,3,3-trimethyl-3H-indolium methyl sulphate
Cas Number:
54060-92-3
Molecular formula:
C20H24N3O.CH3O4S C21H27N3O5S
IUPAC Name:
2-{[2-(4-methoxyphenyl)-2-methylhydrazin-1-ylidene]methyl}-1,3,3-trimethyl-3H-indol-1-ium methyl sulfate
Test material form:
solid

Results and discussion

Vapour pressureopen allclose all
Temp.:
20 °C
Vapour pressure:
0 hPa
Remarks on result:
other: The vapour pressure value for the test item was extrapolated from the experimental data
Temp.:
25 °C
Vapour pressure:
0 hPa
Remarks on result:
other: The vapour pressure value for the test item was extrapolated from the experimental data
Temp.:
50 °C
Vapour pressure:
0 hPa
Remarks on result:
other: The vapour pressure value for the test item was extrapolated from the experimental data

Any other information on results incl. tables

The vapour pressure was measured in the temperature range of 25 °C to 99 °C. Above 58 °C a vapour pressure could be measured. The measured vapour pressures at the corresponding temperatures are listed in Table 1.

Table l: measured vapour pressures and corresponding temperatures

Temperature / °C                                          Vapour pressure / hPa

57.5                                                               1.76 x 10 -05

63.4                                                               3.19 x 10-05

72.0                                                               1.01 x 10-04

76.1                                                               1.59 x 10-04

81.1                                                               2.67 x 10-04

86.0                                                               3.91 x 10-04

90.1                                                               5.40 x 10-04

95.8                                                               8.42 x 10-04

98.8                                                               1.04 x 10-03

The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C

A= 11.45989

B= -5349.40

C= 273.15

Table 2: The extrapolated vapour pressure values of the test item:

 T (°C)
 p (hPa) p (Pa) 
 20 1.63 x 10-07  1.63 x 10-05
 25  3.30 x 10-07 3.30 x 10-05 
 50  8.05 x 10-06 8.05 x 10-04

Applicant's summary and conclusion

Conclusions:
In conclusion, at 20 °C the vapour pressure is 1.63 x 10-7, at 25 °C it is 3.3 x 10-7 and at 50 °C it is 8.05 x 10-6 hPa.
Executive summary:
A study was performed according to EU method A.4 (OECD guideline 104) to measure the vapour pressure of the test item. The vapour pressure was measured in the temperature range of 25 °C to 99 °C. Above 58 °C a vapour pressure could be measured. The final results were presented as extrapolated vapour pressure values at three different temperatures. At 20 °C the vapour pressure is 1.63 x 10-7, at 25 °C it is 3.3 x 10-7 and at 50 °C it is 8.05 x 10-6 hPa.