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EC number: 201-186-8 | CAS number: 79-21-0
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Peer reviewed data
- Qualifier:
- no guideline available
- Principles of method if other than guideline:
- Method described in the publication by Swern (1970)
- GLP compliance:
- no
- Type of method:
- other: not reported
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 14.1 hPa
- Remarks on result:
- other: The vapour pressure was calculated from p(20 °C)=10^(8.911-2311/293) = 10.6 mmHg = 14.1 hPa
- Conclusions:
- The reported data result in a vapour pressure for 20 °C of 14.1 hPa is in line with other results.
- Executive summary:
The calculated vapour pressure at 20 °C is 14.1 hPa.
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- 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:
- yes
- Type of method:
- dynamic method
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 17 hPa
- Conclusions:
- There were no derivations from the guideline. The result of the study shows a vapour pressure at 20 °C of 17 hPa.
- Executive summary:
The vapour pressure of the test item was determined according to OECD guideline no. 104 and EU test method A.4 with the dynamic method.
Vapour pressure (at 20°C): 17 hPa
- Endpoint:
- vapour pressure
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Special simulation program to determine physical-chemical properties of instable substances.
- GLP compliance:
- no
- Type of method:
- other: ASPEN PLUS TM simulation program
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 26 mBar
- Remarks on result:
- other: PAA conc. 38%
- Temp.:
- 20 °C
- Vapour pressure:
- 18 mBar
- Remarks on result:
- other: PAA conc. 20%
- Conclusions:
- The vapour pressure of 38% PAA at 20 °C is 26 mbar and that of 20% PAA is 18.0 mbar.
- Executive summary:
The vapour pressure of 38% PAA at 20 °C is 26 mbar and that of 20% PAA is 18.0 mbar.
Referenceopen allclose all
The relation between the vapour pressure (p) of PAA and absolute temperature (T) from 273 to 383 K (0 to 110 °C) was determined to be: log p [mm] = 8.911 - 2311 / T
The pressure was increased in steps until the atmospheric pressure was reached (1012.0 hPa /104.4 °C). After reducing the pressure to 245.5 hPa consistent results to the extrapolation curve were observed. However, repeated increase of pressure and temperature resulted in deviations from the extrapolation curve due to thermal decomposition. Therefore these two data points were neglected.
Thermal decomposition played not as an important role as in the static method. In the dynamic method volatile (non condensable) decomposition products like oxygen were removed through the cooler. Thus the result was not influenced by such components.
The vapour pressure of the test item at 20 °C was calculated by mathematical extrapolation using the
Antoine equation. It was calculated to 17 hPa (at 20 °C).
log P =A - B / (T + C) with p in hPa; T in °C and A = 8.532676; B = 1932.1226; C = 242.92983
Description of key information
Vapour pressure:
100%: 14.1 hPa
15% : 17 hPa
20% : 18 hPa
38% : 26 hPa
Key value for chemical safety assessment
- Vapour pressure:
- 26 hPa
- at the temperature of:
- 293 K
Additional information
The partial vapour pressure of peracetic acid for 20 °C as reported in the literature is 14.1 hPa (Swern, 1970). The overall vapour pressure of the representative product “Peracetic acid 15%” is 17 hPa when determined according to according to OECD guideline 104 (Mekelburger, 2007). The vapour pressure of peracetic acid at a concentration of 20% and 38% at 20 °C was found to be 18 hPa and 26 hPa, respectively (Turunen, 1996).
Based on a weight of evidence approach and due to the fact that the vapour pressure cannot be determined directly, the worst case vapour pressure of 26 hPa is used as key value and for risk assessment.
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