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Vapour pressure

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Endpoint:
vapour pressure
Type of information:
(Q)SAR
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The result was obtained by an appropriate predictive method.
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 (see attached QMRF and QPRF)
GLP compliance:
no
Type of method:
other: QSAR
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa

A predicted vapour pressure value of 2.7E-09 Pa was determined for the substance. This is an accepted calculation method supported by a limited amount of additional validation.

Conclusions:
A predicted vapour pressure value of 2.7E-09 Pa was determined for the substance using a valid estimation method. The result is considered to be reliable.
Endpoint:
vapour pressure
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
The salts are produced from the parent acid; [Hexane-1,6-diylbis[nitrilo(methylene)]]tetrakisphos-phonic acid. The read-across is therefore based on the presence of common functional groups in both the acid and the salt . The impurity profile of the salt is expected to be similar to that of the parent acid since the salt is prepared from the acid.
Reason / purpose:
read-across source
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa

Description of key information

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

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 HMDTMP has been read-across from the parent acid. A limit vapour pressure value of <2.7E-09 Pa was obtained at 25°C using accepted calculation method (MPBPVP program, USEPA/Syracuse Research, v1.43). The result (Fisk 2010) is considered to be reliable as a key study. This value represents the major constituent only and demonstrates that it is involatile. The vapour pressure of the salt would be expected to be lower than for the acid form.