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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-01-25 - 2018-03-02
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
march 23, 2006
Deviations:
yes
Remarks:
see 'Principles of method if other than guideline'
Principles of method if other than guideline:
The modification being that a direct reading MKS Baritron Capacitance Manometer Model 628C was substituted for the mercury manometer in the method. Water bath temperature was measured using a NIST traceable digital thermometer readable to 0.1° (Certificate # A247308, retest date 11-21-2018).
GLP compliance:
no
Type of method:
static method
Remarks:
see 'Principles of method if other than guideline'
Temp.:
10 °C
Vapour pressure:
586.5 Pa
Key result
Temp.:
21.1 °C
Vapour pressure:
959.8 Pa
Temp.:
50 °C
Vapour pressure:
1 493 Pa
Temp.:
80 °C
Vapour pressure:
2 066.2 Pa

The vapour pressure results are summarized in Table 1 below. See Figure 1 for the vapour pressure plot of phosphorodithioic acid, mixed O,O-bis(isobutyl and isopropyl and pentyl) esters, zinc salts. The test results at 283.2°K (10°C) were unstable and the highest value is reported. The measurements at the other three temperatures were stable.

Table 1. Summary of Vapour Pressure Results for Phosphorodithioic acid, mixed O,O-bis(isobutyl and isopropyl and pentyl) esters, zinc salts

Vapour pressure at

 283.15 K

10 °C

 29425 K

21.1 °C

 323.15 K

50 °C

353.15 K

80 °C

 586.5 Pa  959.8 Pa  1493.0 Pa  2066.2 Pa
Conclusions:
Vapour pressure of the test substance was determined at 4 temperatures:
10 °C: 586.5 Pa
21.1°C: 959.8 Pa
50 °C: 1493.0 Pa
80 °C: 2066.2 Pa
Executive summary:

In accordance with EU A4 Regulation (EC) No 440/2008, Annex, Official Journal of the European Union L142/1, vapour pressure is measured using a modified static method (OECD Guidelines for The Testing of Chemicals, 104, March 23, 2006). The modification being that a direct reading MKS Baritron Capacitance Manometer Model 628C was substituted for the mercury manometer in the method. Water bath temperature was measured using a NIST traceable digital thermometer readable to 0.1° (Certificate # A247308, retest date 11-21-2018).

Vapour pressure of the test substance was determined at 4 temperatures:

10 °C:       586.5 Pa

21.1°C:     959.8 Pa

50 °C:       1493.0 Pa

80 °C:       2066.2 Pa

Description of key information

In accordance with EU A4 Regulation (EC) No 440/2008, Annex, Official Journal of the European Union L142/1, vapour pressure is measured using a modified static method (OECD Guidelines for The Testing of Chemicals, 104, March 23, 2006). The modification being that a direct reading MKS Baritron Capacitance Manometer Model 628C was substituted for the mercury manometer in the method. Water bath temperature was measured using a NIST traceable digital thermometer readable to 0.1° (Certificate # A247308, retest date 11-21-2018).

Vapour pressure of the test substance was determined at 4 temperatures:

10 °C:       586.5 Pa

21.1°C:     959.8 Pa

50 °C:       1493.0 Pa

80 °C:       2066.2 Pa

Key value for chemical safety assessment

Vapour pressure:
959.8 Pa
at the temperature of:
21.1 °C

Additional information