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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP compliant, guideline study, available as an unpublished report, reliable without restrictions
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to guideline
Guideline:
other: OECD 113 (1981) Screening test for thermal stability and stability in air
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Temp.:
35 °C
Vapour pressure:
0 hPa
Remarks on result:
other: Reported as 4.5 x10-6 hPa
Temp.:
40 °C
Vapour pressure:
0 hPa
Remarks on result:
other: Reported as 4.7 x10-6 hPa
Temp.:
45 °C
Vapour pressure:
0 hPa
Remarks on result:
other: Reported as 5.4 x10-6 hPa
Temp.:
50 °C
Vapour pressure:
0 hPa
Remarks on result:
other: Reported as 7.1 x10-6 hPa
Temp.:
55 °C
Vapour pressure:
0 hPa
Remarks on result:
other: Reported as 6.2 x10-6 hPa
Temp.:
60 °C
Vapour pressure:
0 hPa
Remarks on result:
other: Reported as 5.4 x10-6 hPa
Temp.:
65 °C
Vapour pressure:
0 hPa
Remarks on result:
other: Reported as 7.0 x10-6 hPa
Temp.:
20 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: Reported as <1.6 x10-6 Pa
Temp.:
25 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: Reported as <3.0 x10-6 Pa
Temp.:
50 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: Reported as <6.0 x10-5 Pa

The results at 20, 25 and 50 °C are conservative estimations.

Thermal stability:

 Ident-No.  
 Weight (mg)
 Final temperature (°C)    Type of effect Temperature Range (°C)  Enthalpy (J/g) Crucible 
 34841  8.61 300 exothermal 70 - 110 -25 Closed glass crucible
   34841  8.61  300  endothermal  200 - 235  n.r. Closed glass crucible
   34841  8.61  300  exothermal  245 - 280  -24 Closed glass crucible

n.r. = not relevent

Measured vapour pressures and corresponding temperatures (continued from results section):

 Temperature (°C) Vapour pressure (hPa) 
 70  7.8 x 10 -6
 75  1.1 x 10 -5
 80  1.2 x 10 -5
Conclusions:
Based on the measured vapour pressure at 80 °C, the following upper limit vapour pressure values were calculated: <1.6 x10-6 Pa at 20°C, <3.0 x10-6 Pa at 25°C and <6.0 x10-5 Pa at 50°C.
Executive summary:

The vapour pressure and thermal stability of tris(tripheylphosphine) rhodium (I) chloride was assessed by the effusion method standard vapour pressure balance test guidelines. The study is GLP compliant and follows a standard guideline study and is therefore reliable without restrictions.

Measured vapour pressure in the temperature range 35 - 70 °C were below the lower detection limit of the vapour pressure balance of 10-5 hPa. The measured vapour pressure at 75 °C and 80 °C were only slightly above the detection limit of the method.

Based on the measured vapour pressure at 80 °C, the following upper limit vapour pressure values were calculated: <1.6 x10-6 Pa at 20°C, <3.0 x10-6 Pa at 25°C and <6.0 x10-5 Pa at 50°C.

Description of key information

Based on the measured vapour pressure at 80°C, the following upper limit vapour pressure values were calculated: <1.6 x10-6 Pa at 20°C, <3.0 x10-6 Pa at 25°C and <6.0 x10-5 Pa at 50°C.

Key value for chemical safety assessment

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

Additional information

The vapour pressure and thermal stability of tris(tripheylphosphine) rhodium (I) chloride was assessed by the effusion method standard vapour pressure balance test guidelines (Nau 2015). The study is GLP compliant and follows a standard guideline and is therefore reliable without restrictions.

Measured vapour pressure in the temperature range 35 - 70 °C were below the lower detection limit of the vapour pressure balance of 10-5 hPa. The measured vapour pressure at 75 °C and 80 °C were only slightly above the detection limit of the method.

Based on the measured vapour pressure at 80 °C, the following upper limit vapour pressure values were calculated: <1.6 x10-6 Pa at 20°C, <3.0 x10-6 Pa at 25°C and <6.0 x10-5 Pa at 50°C.