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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
04 August 2016 to 04 August 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source: Provided by sponsor
- Lot/batch No.of test material: 150701
- Expiration date of the lot/batch: July 14, 2017

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: At 20 °C ± 5 °C, in the dark
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.046 Pa

The evaluation of the vapour pressure was done applying temperatures between 80 °C and 120 °C, below the melting point.

 

The coefficient of correlation (R2) was 0.9799.

 

The regression line of log PTas a function of log VTused for calibration was given. The coefficient of correlation (R2) was 0.9977. The resulting equation was:

 

log pT= log vT− (−4.1448)/0.8511

 

Inserting the equation for log vTabove, the following equation for the temperature dependence of the vapour pressure of the test item is obtained:

 

log pT= ((a1000 / T + b) − D)/C

 

With this equation, a vapour pressure of the test material was calculated to be 4.60 × 10 -2 Pa at 20 °C.

Table 1. Weight loss of the test item in the temperature range of 90 °C to 120 °C

Temperature[°C]

1000/T

weight loss[μg/min]

Vt[g/cm2h]

log vT

90

2.75482

2.1190

0.000254

-3. 594688

90

2.75482

2.1070

0.000253

-3. 597154

90

2.75482

2.3710

0.000285

-3. 545887

 

100

2.68097

3.1810

0.000382

-3. 418255

100

2.68097

3.1990

0.000384

-3. 415805

100

2.68097

3.5870

0.000430

-3. 366087

 

110

2.61097

4.4860

0.000538

-3. 268959

110

2.61097

4.8740

0.000585

-3. 232933

110

2.61097

4.5890

0.000671

-3. 173485

 

120

2.54453

7.2050

0.000865

-3. 063185

120

2.54453

7.9170

0.000950

-3. 022258

120

2.54453

7.9850

0.000958

-3.018544

Estimation of vT and pT:      logvT/at 20 °C -5.2825587

logpT/at 20 °C -1.3368097

pT/at 20 °C 0.04604583

pT [Pa]/at 20 °C 4.60E-02

Values of log vT and log pT of the reference items

Reference items

Log pT 20 °C

literature/Pa

Log vT 20 °C

extrapolation

Water for analysis

3.3692159

-1.4505983

Naphthalene

0.8129134

-3.2516235

Hexachlorobenzene

-2.8326827

-6.4787177

Chrysene oekanal

-6.0757207

-9.4205195

 

Conclusions:
Under the conditions of the study, the vapour pressure of the test material was determined to be 4.60 × 10^-2 Pa at 20 °C.
Executive summary:

The vapour pressure of the test material has been investigated in a study which was performed under GLP conditions and in accordance with the standardised guidelines OECD 104 and EU Method A.4.

The isothermal thermogravimetric effusion method was applied for the determination of the vapour pressure of the test material. A value of the vapor pressure of the test material was determined using the data obtained between 90 °C and 120 °C. The vapour pressure of the test material was calculated (mean of three determinations). Under the conditions of the study, the vapour pressure of the test material was determined to be 4.60 × 10^-2 Pa at 20 °C.

Description of key information

The vapour pressure of the test material was determined to be 4.60 × 10^-2 Pa at 20 °C when assessed according to OECD 104 and EU Method A.4

Key value for chemical safety assessment

Vapour pressure:
0.046 hPa
at the temperature of:
20 °C

Additional information

The vapour pressure of the test material has been investigated in a study which was performed under GLP conditions and in accordance with the standardised guidelines OECD 104 and EU Method A.4. The study was assigned a reliability score of 1 in accordance with the criteria for assessing data quality set forth by Klimisch et al. (1997).

The isothermal thermogravimetric effusion method was applied for the determination of the vapour pressure of the test material. A value of the vapour pressure of the test material was determined using the data obtained between 90 °C and 120 °C. The vapour pressure of the test material was calculated (mean of three determinations). Under the conditions of the study, the vapour pressure of the test material was determined to be 4.60 × 10^-2 Pa at 20 °C.