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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
15 January 1996 to 8 May 1996
Reliability:
1 (reliable without restriction)
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes
Type of method:
static method
Specific details on test material used for the study:
- Purity: Molybdenum concentration of 10.2%
- Description: Brown, extremely viscous liquid
- Storage: At room temperature (approximately 20°C) in a dark ventilated cabinet
Key result
Test no.:
#1
Temp.:
18 °C
Vapour pressure:
< 10 Pa
Key result
Test no.:
#2
Temp.:
50 °C
Vapour pressure:
268 Pa
Remarks on result:
other: ± 37 Pa
Remarks:
mean of 3 runs at 50°C
Key result
Test no.:
#3
Temp.:
80 °C
Vapour pressure:
488 Pa
Remarks on result:
other: ± 73 Pa
Remarks:
mean of 11 measurements taken at 80°C
Key result
Vapour pressure:
268 Pa
Remarks on result:
other: ± 37 Pa

At room temperature, the test material was allowed to equilibrate in the water bath for 25 minutes. The test temperature was measured to be 18°C (290 K). Three sets of triplicate readings were obtained at 9 to 25 minute intervals over 45 minute periods. At 18°C, the nine vapour pressure readings were determined to be at the limit of detection of the test system, 0.07 torr (10 Pa). No vapour pressure was measured for the test material at room temperature (18°C).

 

At 50°C, three experiments were performed. The water in the water bath evaporated to dryness during the first 50°C experiment. The experiment was initiated a second time, equilibrating to test temperature for 20 minutes. The experiment was aborted due to the air not being evacuated prior to initiation of the vapour pressure readings. The air was then evacuated and the first reading taken after approximately 2.5 hours. Seven vapour pressure readings were then taken at 5 to 20 minute intervals within a final period of approximately 1 hour. Six temperature measurements of 50°C confirmed the test temperature was maintained. The mean measured vapour pressure (± standard deviation) of the test material at 50°C (320 K) was determined to be 2.0 (± 0.28) torr (n=9), equivalent to 268 ± 37 Pa.

 

The test system was then warmed to 80°C, and allowed to equilibrate to test temperature for 20 minutes. Eleven vapour pressure measurements were obtained at 8 to 13 minute intervals over a period of approximately 1.5 hours. The mean measured temperature (± standard deviation) was 79°C (± 0.74°C) (n=8). Vapour pressure measurements generally ranged from 2.9 to 4.4 torr (387 to 592 Pa). The mean measured vapour pressure (± standard deviation) of the test material at 79°C (350 K) was determined to be 3.7 torr (± 0.55 torr) (n=10), equivalent to 488 ± 73 Pa.

Conclusions:
The vapour pressure of the test material at 18°C (290 K) has been determined to be less than 0.07 torr (10 Pa), the lower limit for the static method used.
Executive summary:

The vapour pressure of the test material was conducted in a study performed to the standardized guideline OECD 104 under GLP conditions. The vapour pressure of the test material at 18°C (290 K) has been determined to be less than 0.07 torr (10 Pa), the lower limit for the static method used.

Description of key information

The vapour pressure of the test material was conducted in a study performed to the standardized guideline OECD 104 under GLP conditions. The vapour pressure of the test material at 18°C (290 K) has been determined to be less than 0.07 torr (10 Pa), the lower limit for the static method used.

Key value for chemical safety assessment

Vapour pressure:
10 Pa
at the temperature of:
18 °C

Additional information