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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 2017-11-21 to 2018-01-15
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 0
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7220 (Boiling Point / Boiling Range)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
method according to Siwoloboff
Test material information:
Composition 1
Specific details on test material used for the study:
Batch No.: VPS9016001
Purity: 97.3 %
Key result
Atm. press.:
101 325 Pa
Decomposition:
yes
Decomp. temp.:
250.5 °C

Reference test

Table 1. Checking of the apparatus

Atmospheric pressure, kPa

(at the measuring)

Boiling point, °C

(at standard atmospheric pressure)

99.81

100.1

99.80

100.0

99.80

100.1

Mean:

100.1

The boiling point of water was determined to be 100.1 °C (373.2 K). Measured values were determined to be in the required range (literature value ± 0.5 °C).

 

Preliminary test

At the end of the measurement bumping was recorded by the device.

Table 2. Preliminary test results

Start temperature, °C

Heating rate, °C/min

Atmospheric pressure, kPa

(at the measuring)

Boiling point, °C
(at standard atmospheric pressure)

38

5

99.75

257.4

 

Main test

Three tests were carried out. The boiling temperature was determined and the boiling point ofthe test itemwas determined to be 250.5 ± 4.85 °C (95 % confidence interval) i.e. 523.7 K. At the end of the measurementsbumping was observed. At the end of the measurements the color of the samples remained transparent and colorless.

Table 3. Determination of the boiling point

Atmospheric pressure, kPa

(at the measuring)

Boiling point, °C

(at standard atmospheric pressure)

99.72

248.6

99.71

250.4

99.72

252.5

Mean:

250.5

RSD (CV %):

2.0

Conf.int. (95 %)

4.85

 

Supplementary test

The endotherm and exotherm peaks in the thermogram do not imply phase transition from a liquid to vapour state. Using a linear heating rate boiling point was not observed from room temperature up to 500 °C.

In the temperature range of approx. 140 - 290 °C exothermic reactions could be observed, which were assumed to be the decomposition of the test item.

Conclusions:
The test item decomposes at 250.5 °C. No boiling point was determined up to 500 °C.
Executive summary:

A study was conducted according to OECD test guideline 103, Regulation (EC) No 440/2008 method A.2 and EPA OPPTS 830.8220 to determine the boiling point of the test item using the principle according to Siwoloboff. A small amount of the test item was filled in a capillary tube and was heated in the electronically temperature controlled sample block. In a preliminary test a boiling point of 257.4 °C was observed. This value was introduced as expected boiling temperature for the main test. The sample was heated from 242 °C at rate 0.5 °C/minute. The sample was observed visually for any possible changes in appearance, consistency and colour. The phase transition from liquid to vapour was deduced by the continuous formation of steam bubbles leaving the inserted boiling capillary. This determination was done in triplicate. The atmospheric pressure was recorded. The boiling temperature was determined and the boiling point of the test item was determined to be 250.5 ± 4.85 °C (95 % confidence interval) i.e. 523.7 K. At the end of the measurements bumping was observed and the color of the samples remained transparent and colorless. A supplementary test with DSC was performed. The endotherm and exotherm peaks in the thermogram do not imply phase transition from a liquid to vapour state. Using a linear heating rate boiling point was not observed from room temperature up to 500 °C. In the temperature range of approx. 140 - 290 °C exothermic reactions could be observed, which were assumed to be the decomposition of the test item. Based on this signal and the result of the supplementary test with differential scanning calorimetry (DSC) method, the 250.5 °C (523.7 K) is considered to be a decomposition temperature.

Description of key information

The test item decomposes at 250.5 °C.

Key value for chemical safety assessment

Additional information

A study was conducted according to OECD test guideline 103, Regulation (EC) No 440/2008 method A.2 and EPA OPPTS 830.8220 to determine the boiling point of the test item using the principle according to Siwoloboff. A small amount of the test item was filled in a capillary tube and was heated in the electronically temperature controlled sample block. In a preliminary test a boiling point of 257.4 °C was observed. This value was introduced as expected boiling temperature for the main test. The sample was heated from 242 °C at rate 0.5 °C/minute. The sample was observed visually for any possible changes in appearance, consistency and colour. The phase transition from liquid to vapour was deduced by the continuous formation of steam bubbles leaving the inserted boiling capillary. This determination was done in triplicate. The atmospheric pressure was recorded. The boiling temperature was determined and the boiling point of the test item was determined to be 250.5 ± 4.85 °C (95 % confidence interval) i.e. 523.7 K. At the end of the measurements bumping was observed and the color of the samples remained transparent and colorless. A supplementary test with DSC was performed. The endotherm and exotherm peaks in the thermogram do not imply phase transition from a liquid to vapour state. Using a linear heating rate boiling point was not observed from room temperature up to 500 °C. In the temperature range of approx. 140 - 290 °C exothermic reactions could be observed, which were assumed to be the decomposition of the test item. Based on this signal and the result of the supplementary test with differential scanning calorimetry (DSC) method, the 250.5 °C (523.7 K) is considered to be a decomposition temperature.