[[(phosphonomethyl)imino]bis[hexamethylenenitrilobis(methylene)]]tetrakisphosphonic acid

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

(Q)SAR

Adequacy of study:

key study

Reliability:

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:

See attached QMRF and QPRF

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

Test no.:

#1

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 at 25°C was determined for the substance using a valid estimation method. The result is considered to be reliable.

Description of key information

Vapour pressure (BHMT-H): 2.7E-9 Pa at 25°C (QSAR)

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

25 °C

Additional information

A vapour pressure value of 2.7E-9 Pa at 25°C was obtained for BHMT-H using an 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 that of the acid form.

 

In another secondary source to which no reliability could be assigned, a limit vapour pressure of <17 hPa was reported.

HMDTMP-H is a named impurity in the registered substance. The vapour pressure of HMDTMP-H is also predicted to be 2.7E-9 Pa at 25°C.