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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:
07 May 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point)
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7220 (Boiling Point / Boiling Range)
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Type of method:
method according to Siwoloboff
Key result
Boiling pt.:
260 °C
Atm. press.:
101.325 kPa

Accuracy checking


The accuracy of the instrument was checked by determining the melting point of a certified sample of benzoic acid (certified melting point: 122.4°C ± 0.3°C). The results were:


First determination: 122.6°C


Second determination: 122.5°C


 


Boiling point determination


First determination: observed boiling point: 258.7°C


Second determination: observed boiling point: 258.3°C


 


Correction to normalized pressure


The atmospheric pressure at the time of the experiment was 96.79 kPa (Meteo Suisse). A correction of the temperature to normalised pressure (101.325 kPa) was made. The determination of this correction factor was made using the Sidney Young equation, as recommended in OECD guideline 103.


Tn=T+(fT-Δp)


Where:


Δp = 101.325 kPa — p


p = pressure in kPa; the pressure was obtained from the Swiss meteorological service for the time of the experiment;


fT= rate of change of boiling temperature with pressure in K/kPa, here a value of 0.45 K/kPa, as published in the OECD guideline 103, was used.


T = temperature in K


Tn= normal boiling point


 


With this correction made, it can be concluded that the standard boiling point of test item is (values rounded off): 534K (260°C).

Executive summary:

The boiling point of test item was measured according to OECD Guideline No. 103, with the Siwoloboff capillary method, and under GLP.


After preliminary testing, two main determinations were performed, at a heating rate of 0.5°C/minute. Results were within precision. The atmospheric pressure at the time of the experiment was 96.79 kPa. A correction of the temperature to normalised pressure (101.325 kPa) was made with the Sidney-Young equation.


The normal boiling point of test item is 260°C (534K).

Description of key information

Experimental boiling point = 260 °C (corrected to normal atmP). (OECD 103, GLP)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
260 °C

Additional information

A fully reliable experimental study, conducted according to a recognized OECD method and under GLP, is available.
It is considered as a key study; the result is retained as key data for CSA.