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Diss Factsheets

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:
2010
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

Constituent 1
Chemical structure
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.

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.