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Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
3 (not reliable)
Rationale for reliability incl. deficiencies:
other: Publication meets basic scientific principles, due to limited documentation not acceptable for assessment
Reference:
Composition 1
Qualifier:
no guideline followed
Principles of method if other than guideline:
Test substance was chromatographed on a GLC system and elution was compared with a standard.
GLP compliance:
no
Type of method:
other: gas-liquid chromatography
Test material information:
Composition 1
Temp.:
25 °C
Vapour pressure:
0.001 mm Hg
Remarks on result:
other: corresponding to 0.067 Pa
Conclusions:
The vapour pressure of isopropylbiphenyl (mixture of isomers) was determined to be 0.0005 mmHg (0.067 Pa) using gas liquid chromatography with the standard di-n-butyl phthalate.
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Method similar to OECD 104; limited reporting
Reference:
Composition 1
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
yes
Remarks:
; limited reporting
GLP compliance:
no
Type of method:
dynamic method
Test material information:
Composition 1
Temp.:
25 °C
Vapour pressure:
0.762 Pa

Vapour pressure of (1-methylethyl)-1,1'-biphenyl (monoisopropylbiphenyl, MIPB - mixture of isomers)

 

Temperature[°C]

96

134

148

163

174

188

208

Vapour pressure[hPa]

1

5

10

20

30

50

100

 

Linear regression equation:       log p = -3,211.296 (1/T) + 10.653

 

Vapour pressure of (1-Methylethyl)-1,1'-biphenyl:

 

Temperature [°C]

20

25

30

Vapour pressure [Pa]

0.4993

0.7623

1.1475

 

Conclusions:
The vapour pressure of (1-methylethyl)-1,1'-biphenyl (monoisopropylbiphenyl - MIPB) was determined using a method similar to OECD TG 104. From the regression line of log p vs 1/T, the vapour pressure at 20 and 25°C was calculated to be 0.50 and 0.76 Pa, respectively.

Description of key information

The vapour pressure of (1-methylethyl)-1,1'-biphenyl was determined based on OECD TG 104 (dynamic method). The regression equation of the plot log p versus 1/T was used to calculate the vapour pressure at ambient temperatures.

Key value for chemical safety assessment

Vapour pressure:
0.762 Pa
at the temperature of:
25 °C

Additional information

Vapour pressure of (1-methylethyl)-1,1'-biphenyl was determined using two different methods (RÜTGERS 2010: similar to OECD TG 104, and Addison 1983: non guideline GLC method). Results are close together (both below 1 Pa, 0.762 and 0.067 Pa, respectively). Key study is RÜTGERS as the method used follows OECD TG 104, and reliability is higher than the method applied in the Addison study (RL3, WoE).