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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-03-24
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: estimation only valid for organic substances
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Regulation 440/2008/EC; Part A
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
1995
Deviations:
no
Principles of method if other than guideline:
The vapour pressure of dipotassium persulfate was calculated by EPI Suite (v4.0). The preferred vapour pressure method for solids is the Modified Grain method (Lyman 1985).
GLP compliance:
not specified
Type of method:
other: calculation
Temp.:
25 °C
Vapour pressure:
< 0 mm Hg
Remarks on result:
other: estimation: 6.07E-30 mm Hg => 8.09E-28 Pa
Transition / decomposition:
yes
Transition temp.:
ca. 100 °C

no remarks

Conclusions:
The vapour pressure of dipotassium persulfate at 25 °C was estimated to be 6.07E-30 mm Hg corresponding to 8.09E-28 Pa using the Modified Grain Method.
Executive summary:

As the available experimental methods allow a determination of vapour pressure down to 1E-5 Pa only, no meaningful experimental determination of the vapour pressure for dipotassium persulfate was possible. Therefore, in accordance with the respective EC method A.4 (440/2008/EC) no experimental determination of the vapour pressure was carried out.

Description of key information

The vapour pressure of dipotassium persulfate at 25 °C was estimated at 6.07E-30 mm Hg corresponding to 8.09E-28 Pa using the Modified Grain Method of US EPA v4.0. A default value of 1E-6 Pa was used for further risk assessment.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

As the available experimental methods allow a determination of vapour pressure down to 1E-5 Pa only, no meaningful experimental determination of the vapour pressure for dipotassium persulfate was possible.

Therefore, in accordance with the respective EC method A.4 (440/2008/EC) no experimental determination of the vapour pressure was carried out. Notably, inorganic chemicals are outside of the EPIWIN (v4.0) domain. Nevertheless, the vapour pressure of dipotassium persulfate is very low.