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Vapour pressure

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vapour pressure
Type of information:
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
Please refer to attached justification documents
Principles of method if other than guideline:
Estimation by MPBPVP program, USEPA/Syracuse Research, v1.40
Key result
Test no.:
25 °C
Vapour pressure:
0 Pa
A vapour pressure value of 2.7E-09 Pa at 25°C was obtained for DTPMP-H using a relevant estimation method. The result is considered to be reliable.

Description of key information

Vapour pressure [DTPMP-xNH4]: < 2.7E-09 Pa at 25°C (QSAR)

Vapour pressure [ammonia]: 861100 Pa at 20°C

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the sodium salt of DTPMP has been read-across from the parent acid (DTPMP-H). A predicted vapour pressure of 2.7E-9 Pa at 25°C was obtained for DTPMP-H using an accepted calculation method (MPBPVP program, USEPA/Syracuse Research, v1.43). This predicted value is read-across to the salt, DTPMP-xNH4 as <2.7E-9 at 25°C since the vapour pressure of the salt is expected to be lower than that of the parent acid. The result (Fisk 2010) is considered to be reliable and is selected as a key study.


The minor constituents are phosphonate salts that are structurally similar to the main constituent or inorganic salts; all will have negligible vapour pressure. Any excess ammonia present in the ammonium salt may be volatile.

Ammonia has a reported vapour pressure of 861100 Pa at 20°C [OECD SIDS (2007).


OECD SIDS (2007). SIDS Initial Assessment Report for SIAM 24, Paris, France, 17-20 April 2007, Ammonia Category