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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
01 Mar - 28 May 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Qualifier:
according to guideline
Guideline:
other: OECD Test Guideline No. 113
Version / remarks:
1981
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
yes (incl. QA statement)
Remarks:
Hess. Ministerium für Umwelt, Klimaschutz, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
Storage conditions: room temperature
Temp.:
20 °C
Vapour pressure:
< 0.007 Pa

Results
Thermal stability
In the temperature range of 220 – 250 °C an endothermic effect can be observed. No further effects could be observed up to 300 °C.

Table 2 – DSC measurement results

Sample weight [mg]

Start [°C]

Energy [J/g]

11.92

220 (endo)

-120

 

Effusion method: Knudsen cell
In the second test series, the vapour pressure was measured in the temperature range of 126 to 151 °C.
Table 3 – Effusion method results

No.

Temperature [°C]

Vapour pressure [Pa]

1

126.0

7.36E-03

2

131.0

1.45E-03

3

135.9

1.31E-03

4

140.9

1.49E-03

5

145.9

1.37E-03

6

150.9

2.89E-03

 

Due to the fact that the dried solid test item showed no proper linear correlation of the vapour pressure and the inverse temperature 1/T, the Antoine constants cannot be evaluated in the measured temperature range. Due to this result, the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the maximum measured vapourpressure of
7.36 × 10-3 Pa at a temperature of 126.0 °C to be < 0.007 Pa.

 

Conclusion
The dried solid test item
ETA Lösung 181 / TRISODIUM EDTA SOLUTION 20%showed no evaluable vapour pressure curve in the temperature range of 126.0 to 150.9 °C. Due to this result, the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the maximum vapour pressures measured of the second measurement, according to Regulation EC No. 440/2008 Method A.4.Vapour Pressureand OECD Test Guideline 104 (2006)as shown inTable4:

Table 4

Temperature [°C]

Vapour pressure [Pa]

20

< 0.007

25

< 0.007

50

< 0.007

 

Description of key information

<0.007 Pa at 20, 25, 50 °C (OECD 104)

Key value for chemical safety assessment

Vapour pressure:
0.007 Pa
at the temperature of:
50 °C

Additional information

The test item showed no evaluable vapour pressure curve in the temperature range of 126.0 to 150.9 °C. Due to this result, the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the maximum vapour pressures measured of the second measurement, according to Regulation EC No. 440/2008 Method A.4.Vapour Pressure and OECD Test Guideline 104 (2006)