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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2017-06-13 to 2017-06-28
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
method according to Siwoloboff
Key result
Boiling pt.:
140.3 °C
Atm. press.:
1 013.25 hPa
Decomposition:
no

Pre-Test

Formation of the bubble was observed at 128 °C. At 148 °C the bubble chain was visible and the burner was turned off. The chain broke at 139.9 °C. After cooling down no visual changes were observed.

Method following Siwoloboff (Main Test)

The measured values and all observations are presented in the following table.

Table 1: Measured values

Determination Boiling Point Atmospheric
Pressure
First determination 139.1 °C (412.3 K) 98844 Pa
Second determination 139.6 °C (412.8 K) 98252 Pa

Table 2: Observations

Observations

First

determination

Second determination
Individual bubble visible 133 °C 135 °C
Bubble chain; turned off heating plate 144.6 °C 144.5 °C
After cooling down

No visual

changes were observed

No visual changes
were observed

Evaluation

The boiling temperature at standard pressure can be calculated following the equation of Sidney-Young (only for small pressure deviations):

Tn= T+(fT*Δp)

with

Tn =boiling point at 101.325 kPa in K

T = measured boiling point in K

fT= rate of change of boiling temperature with pressure in K/kPa (temperature-related correction factor)

Δp = (101.325 - p) in kPa

p = measured atmospheric pressure in kPa

The temperature-related correction factor (fT) was calculated as 0.34 K/kPa for all boiling point values (412.3 K and 412.8 K) using the following equation:

fT= 0.000843636*T (in K) - 0.008984727

The result is calculated as mean of the two values of the duplicate determination.

Table 3: Corrected values following Sidney-Young

  Boiling point Pressure in Pa Corrected
boiling point
First determination 139.1 °C
(412.3 K)
98844 Pa 139.94 °C
(413.09 K)
Second determination 139.6 °C
(412.8 K)
98252 Pa 140.64 °C
(413.79 K)
Mean    

140.3 °C
(413.4 K)

Mean ± standard deviation (after correction following Sydney-Young) = 140.3 ± 0.5 °C (413.4 ± 0.5 K) at standard pressure (101.325 kPa).

Conclusions:
The boiling point of the test item was determined to be 140.3 ± 0.5 °C (413.4 ± 0.5 K) at 1013.25 hPa.
Executive summary:

The study was performed according to OECD test guideline 103 and Regulation (EC) No. 440/2008 method A.2 in order to determine the boiling point of the test item by using the Siwoloboff method. During the determination no visual changes of the test item were observed. The mean boiling point of the test item was determined to be 140.3 ± 0.5 °C (corresponding to 413.4 ± 0.5 K). The value was calculated from two independent determinations, corrected to the standard pressure of 1013.25 hPa by using the Sidney-Young equation.

Description of key information

The boiling point of the test item was determined to be 140.3 ± 0.5 °C (413.4 ± 0.5 K) at 1013.25 hPa.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
140.3 °C

Additional information

The study was performed according toOECD test guideline 103 and Regulation (EC) No. 440/2008 method A.2 in order to determine the boiling point of the test item by using the Siwoloboff method. During the determination no visual changes of the test item were observed. The mean boiling point of the test item was determined to be 140.3 ± 0.5 °C (corresponding to 413.4 ± 0.5 K). The value was calculatedfrom two independent determinations, corrected to the standard pressure of 1013.25 hPa by using the Sidney-Young equation (reference 4.3-1).