Registration Dossier
Registration Dossier
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EC number: 200-023-8 | CAS number: 50-28-2
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- no
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- not applicable
- GLP compliance:
- yes
- Type of method:
- effusion method: vapour pressure balance
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: Confidence limit: 3.7x 10E-9 - 3.6x10E-8 Pa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: Confidence limit: 1.0x 10E-8 - 8.7x10E-8 Pa
- Temp.:
- 30 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: Confidence limit: 2.6x 10E-8 - 1.9x10E-7 Pa
- Conclusions:
- The vapour pressure was determined at 25 °C to be 3x10E-08Pa (confidence limit: 1.0x10E-08and 8.7x10E-08Pa).
- Executive summary:
According to the OECD Testing Guideline No.104 the temperature dependence of the vapour pressure was determined with the Knudsen effusion method using a vapour pressure balance in the temperature range 100 to 135 °C. For measurement, the vapour jet of the test substance leaving a heatable Knudsen cell through an aperture of known size under high vacuum conditions is condensed on the cooled scale pan of a precision "Cahn"-microbalance. The evaporation rate is determined from the increase in weight per unit time from which the vapour pressure is calculated with the Hertz Knudsen Langmuir equation. The vapour pressure was determined at 25 °C to be 3x10-08Pa (confidence limit: 1.0x10-08and 8.7x10-08Pa). The Henry constant was calculated to be 1.1x10-9at 25 °C. Thus the substance is to be considered non-volatile in aqueous solution.
Reference
The vapour pressures were calculated for 20, 25 and 30 °C using a semilogarithmic linear regression based on the Antoin equation.
Description of key information
The vapour pressure was determined at 25 °C to be 0.00000003Pa (95%confidence interval: 0.00000001 - 0.000000087 Pa).
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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