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EC number: 270-608-0 | CAS number: 68457-79-4
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 8 June 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: The study was performed according to guideline
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: vapour pressure balance
Test material
- Reference substance name:
- Phosphorodithioic acid, mixed O,O-bis(iso-Bu and pentyl) esters, zinc salts
- EC Number:
- 270-608-0
- EC Name:
- Phosphorodithioic acid, mixed O,O-bis(iso-Bu and pentyl) esters, zinc salts
- Cas Number:
- 68457-79-4
- Molecular formula:
- {[(iso-C4H9O)0.64(C5H11O)0.36]PS2}2Zn - neutral, {[(iso-C4H9O)0.64(C5H11O)0.36]PS2}6Zn4O - basic
- IUPAC Name:
- Phosphorodithioic acid, mixed O,O-bis(iso-Bu and pentyl) esters, zinc salts
- Details on test material:
- - Substance type: a mixture of coordination compounds in oil consisting of a zinc metal complex bonded to alkyldithiophosphate ligands.
Constituent 1
Results and discussion
Vapour pressureopen allclose all
- Temp.:
- 25 °C
- Vapour pressure:
- 0.003 Pa
- Remarks on result:
- other: extrapolated from plot of logPa vs. 1/K; quantity of vapour generated between 0 - 50 C was too low to measure
- Temp.:
- 50 °C
- Vapour pressure:
- 0.023 Pa
- Remarks on result:
- other: extrapolated from plot of logPa vs. 1/K; quantity of vapour generated between 0 - 50 C was too low to measure
- Temp.:
- 70 °C
- Vapour pressure:
- 0.107 Pa
- Remarks on result:
- other: 70 deg. C is the maxiumu use temperature of this substance
Any other information on results incl. tables
A total of 5 runs were recorded. A summary of the results is shown in table 1 below. Raw data including temperature, mass, and pressure measurements for each of the runs are shown in attached Figures 1 - 5.
Table 1. Summary of Vapour Pressure Measurements
Run # |
Vapour Pressure Values |
||
25 C |
50 C |
70 C |
|
1 |
-2.650 |
-1.642951 |
-0.942852 |
2 |
-2.607 |
-1.628880 |
-0.948951 |
3 |
-2.571 |
-1.620030 |
-0.959035 |
4 |
-2.619 |
-1.659670 |
-0.992692 |
5 |
-2.587 |
-1.651916 |
-1.001418 |
Mean logPa |
-2.6068 |
-1.640689 |
-0.968990 |
Mean Pa |
0.002473 |
0.022872 |
0.107401 |
Mean kPa |
2.4729E-06 |
2.2872E-05 |
1.0740E-04 |
Applicant's summary and conclusion
- Conclusions:
- The vapour pressure of the substance is 0.0025 at 25 degrees C.
- Executive summary:
The vapour pressure of the test substance was determined using the vapour pressure balance method following EU Method A.4 guidelines. Measurements were taken between temperatures of 75 - 85 degrees C. This range of temperatures was selected because the quantity of vapor generated was too low to measure in the range of 0 - 50 degrees C.
A plot of logPa vs. 1/K was generated from the experimental measurements from which the vapour pressure at 25 degrees C was extrapolated.The vapour pressure of the test substance (based on five replicate measurements) is:
0.0025 Pa at 25 deg. C
0.023 Pa at 50 deg. C
The substance did not show a change in appearance under the conditions used in the determination.
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