Reaction mass of carbon tetrachloride and chloroform and 1,2-dichloroethane

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Type of information:

not specified

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Remarks:

The CRC handbook is a peer-reviewed source, therefore considered reliable. Restrictions applies as no details are available.

Principles of method if other than guideline:

No data.

Temp.:

-79.4 °C

Vapour pressure:

1 Pa

Remarks on result:

other:

Remarks:

solid

Temp.:

-70.8 °C

Vapour pressure:

10 Pa

Remarks on result:

other:

Remarks:

solid

Temp.:

-53.5 °C

Vapour pressure:

100 Pa

Remarks on result:

other:

Remarks:

solid

Temp.:

-24.4 °C

Vapour pressure:

1 kPa

Remarks on result:

other:

Remarks:

solid

Temp.:

15.8 °C

Vapour pressure:

10 kPa

Temp.:

76.2 °C

Vapour pressure:

100 kPa

Key result

Temp.:

20 °C

Vapour pressure:

11.8 kPa

Remarks on result:

other: interpolated

Temp.:

40 °C

Vapour pressure:

33.4 kPa

Remarks on result:

other: interpolated

Temp.:

70 °C

Vapour pressure:

127 kPa

Remarks on result:

other: interpolated

Temp.:

110 °C

Vapour pressure:

546 kPa

Remarks on result:

other: extrapolated

A linear regression was derived from the six values available in the handbook:

log VP (in Pa) = -2079.6 / T (in K) + 11.165

coef determination (R2) = 0.9786

The vapour pressure at 20, 40, 70 and 110°C were calculated from this equation, for purpose of risk assessment (process temperatures).

It should be noted that, up to 110°C, the relationship between VP and (1/)T may not be linear anymore. The extrapolated value was nevertheless calculated from the linear regression, as a worst-case for risk assessment purpose, compared to the non-linear Antoine equation (for information, 170 kPa at 110°C).

Conclusions:

The constituent has HIGH volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA), > 10 kPa).

Executive summary:

The CRC handbook provides various physico-chemical parameters.

For the substance Tetrachloromethane, a series of 6 vapour pressure/temperature values are available, between 1 Pa and 100 kPa.

Vapour pressures of 11.8, 33,4 and 127 kPa were interpolated from the derived linear regression, for 20, 40 and 70°C respectively, and an extrapolated value of 546 kPa was calculated for 110°C.

Reference 2

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Remarks:

OECD SIAP is a peer-reviewed source, therefore considered reliable. Restrictions applies as no details are available.

Principles of method if other than guideline:

Measured vapour pressure. No other data.

Key result

Temp.:

20 °C

Vapour pressure:

12 kPa

Conclusions:

The constituent has HIGH volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA), > 10 kPa).

Executive summary:

The OECD SIAP provides some physico-chemical parameters within the framework of the human health and environmental assessment.

For vapour pressure, a measured value of 12 kPa at 20°C is cited.

Description of key information

11.8 kPa at 20°C (interpolated)

33.4 kPa at 40°C (interpolated)

127 kPa at 70°C (interpolated)

546 kPa at 110°C (extrapolated)

Key value for chemical safety assessment

Vapour pressure:

11.8 kPa

at the temperature of:

20 °C

Additional information

Numerous published data were available for the constituent. Two sources were selected, considered as reliable, and providing a consensus value:

- the CRC handbook gives a series of VP/T data, that allowed to derive a linear regression, and use it to calculate the estimated VP at the various process temperatures, for risk assessment purpose;

- the OECD SIAP is said to be a measured data, and the given value of 12 kPa at 20°C is very consistent with the value calculated from the above regression.

For consistency purpose, all key values retained come from the CRC data regression.