(1-methylethyl)-1,1'-biphenyl

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

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

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

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.

Reference 2

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

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

yes

Remarks:

; limited reporting

GLP compliance:

no

Type of method:

dynamic method

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).