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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:
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

- 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