Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Vp = 0.031 Pa at 25°C
Key value for chemical safety assessment
- Vapour pressure:
- 0.031 Pa
- at the temperature of:
- 25 °C
Additional information
No data on the vapour pressure of the substance is available. The results from the structural analogue are used instead (for details see reporting Format as attached to section 13 in the IUCLID dossier).
The vapour pressure of the structural analogue Reaction mass of tetrasodium phosphonoethane-1,2-dicarboxylate and hexasodium-phosphonobutane-1,2,3,4-tetracarboxylate has been determined according the EU method A.4 of the Commission directive 84/449/EEC and the GLP.
The vapour pressure was determined using a vapour pressure balance based on a CI electronics micro-balance with a sensitivity of 0.1µg. The temperature of the sample was controlled electronically (+/- 1°C) over the range ambient to 60°C. The mass readings and temperature were recorded directly onto a 2 channel chart recorder. The vapour pressure of the sample was measured at several temperatures to yield vapour pressure curves for subsequent extrapolation to give 25°C values. Three runs from 24 to 61°C were performed.
The sample underwent degassing (presumably loss of water). Subsequent runs gave progressively lower vapour pressure values (i.e 10E-3 Pa and 5.3E-4 Pa at 25°C for runs 2 and 3) due to possible change in composition. Results from run 1 have been quoted but the results for runs 2 and 3 are probably more representative of the substance. Based on these observations, this study is considered as reliable with restrictions.
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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