Registration Dossier

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:
2010
Report Date:
2010

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: vapour pressure balance

Test material

Reference
Name:
Unnamed
Type:
Constituent
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:
0.007 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.