Phosphonic acid, magnesium salt (2:1)

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22/06/2017 - 23/06/2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

GLP compliance:

no

Type of method:

effusion method: vapour pressure balance

Temp.:

20 °C

Vapour pressure:

< 0 hPa

Temp.:

25 °C

Vapour pressure:

< 0 hPa

Temp.:

50 °C

Vapour pressure:

< 0 hPa

The vapour pressure was measured in the temperature range of 70 °C to 120 °C.

Since the mesured vapour pressures showed an unusual behaviour, the values for 20, 25 and 50 °C

were estimated using the Antoine equation. This leads to a conservative estimation of the vapour pressure of the test item for the listed temperatures. In order to further ensure a conservative approach the vapour pressures were rounded up to the next order of magnitude in order to obtain final upper limit values for the vapour pressure.

Conclusions:

Based on the measured vapour pressure at 80 °C (vapour pressure balance), the following upperlimit vapour pressure values for the test item were calculated:T / °C p / hPa p20 < 1 × 10-6 25 < 1 × 10-5 50 < 1 × 10-4

Key value for chemical safety assessment

Vapour pressure:

0 hPa

at the temperature of:

20 °C