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EC number: 283-392-8 | CAS number: 84605-29-8
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 3 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(1,3-dimethylbutyl and iso-Pr) esters, zinc salts
- EC Number:
- 283-392-8
- EC Name:
- Phosphorodithioic acid, mixed O,O-bis(1,3-dimethylbutyl and iso-Pr) esters, zinc salts
- Cas Number:
- 84605-29-8
- Molecular formula:
- Not applicable
- IUPAC Name:
- Phosphorodithioic acid, mixed O,O-bis(1,3-dimethylbutyl and iso-Pr) 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:
- 0.007 Pa
- Remarks on result:
- other: extrapolated from plot of logPa vs. 1/K; quantity of vapour generated between 0 - 50 deg. C was too low to measure
- Temp.:
- 50 °C
- Vapour pressure:
- 0.04 Pa
- Remarks on result:
- other: extrapolated from plot of logPa vs. 1/K; quantity of vapour generated between 0 - 50 deg. C was too low to measure
- Temp.:
- 70 °C
- Vapour pressure:
- 0.138 Pa
- Remarks on result:
- other: 70 deg. C is the temperature of maximum use of this substance
Any other information on results incl. tables
A total of 10 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 - 10.
Table 1. Summary of Vapour Pressure Measurements
Run # |
Vapour Pressure Values |
||
25 C |
50 C |
70 C |
|
1 |
-2.366000 |
-1.4999208 |
-0.898206 |
2 |
-2.183000 |
-1.3829335 |
-0.826329 |
3 |
-1.974000 |
-1.2659353 |
-0.773676 |
4 |
-2.072000 |
-1.3352145 |
-0.823589 |
5 |
-2.278000 |
-1.4629926 |
-0.896710 |
6 |
-2.124000 |
-1.3856885 |
-0.872170 |
7 |
-2.111000 |
-1.3782069 |
-0.868738 |
8 |
-1.908000 |
-1.2728016 |
-0.831374 |
9 |
-2.258000 |
-1.4821821 |
-0.943573 |
10 |
-2.317000 |
-1.5296698 |
-0.981940 |
Mean logPa |
-2.159100 |
-1.399555 |
-0.859374 |
Mean Pa |
0.006933 |
0.039852 |
0.138238 |
Mean kPa |
6.9327E-06 |
3.9852E-05 |
1.3824E-04 |
Applicant's summary and conclusion
- Conclusions:
- The vapour pressure of the substance is 0.0069 Pa 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 90 - 100 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 10 replicate measurements) is:
0.0069 Pa at 25 deg. C
The substance did not show a change in appearance under the conditions used in the determination.
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