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EC number: 244-121-9 | CAS number: 20941-65-5
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 23 March 2006
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 24 August 2009
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: Knudsen cell
- Specific details on test material used for the study:
- SOURCE OF TEST MATERIAL
- Name of the test material (as cited in study report): Tellurium diethyldithiocarbamate
- Batch No.: 60700109
- Expiration date of the lot/batch: 10-07-2018
- Purity: 99.19% (HPLC)
- Appearance: Light orange to yellow powder
STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: stored in a tightly closed vessel at 16.6 – 20.4 °C under dry conditions in the dark.
- Solubility and stability of the test substance in the solvent/vehicle: H2O: <0.1g/L; EtOH: unknown; acetone: unknown CH3CN: unknown; DMSO: unknown - Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- not measured/tested
- Remarks:
- calculated from the regression equation
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- not measured/tested
- Remarks:
- calculated from the regression equation
- Temp.:
- 60 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: determined experimentally
- Temp.:
- 75 °C
- Vapour pressure:
- 0.002 Pa
- Remarks on result:
- other: determined experimentally
- Temp.:
- 90
- Vapour pressure:
- 0.018 Pa
- Remarks on result:
- other: determined experimentally
Reference
- At the first measurement of the experiment at 105 °C the test item melted to a red mass. During the two further measurements the test item became darker. This can be a sign of decomposition
and to avoid bias these measurements were not used for calculation.
- 3 out of 6 experiments showed relevant and reproducible weight loss. All evaluated experiments showed good reproducibility, giving relative standard deviations of less than 27 % and perfect correlation. Therefore, the result of the test can be considered valid.
- The vapour pressure was calculated using the following equation: p=(m/K*A*t)*sqrt(2*pi*R*T/M).
- Where:
p: vapour pressure in Pa
m: weight loss in kg
t: time in s
A: area of aperture in m^2
K: correction factor
R: universal gas constant in J/Mol*K
T: temperature in K
M: molecular weight in kg/Mol
Description of key information
The vapour pressure of the test substance is calculated to be 2.28E-7 Pa at 20 °C and 6.05E-7 at 25 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
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