Naphthalenesulfonic acid, di-C9-rich C8-10-branched alkyl derivs., calcium salts

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) is a close structural analog and the data are acceptable as read-across.

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

Principles of method if other than guideline:

Experiments were performed to determine the vapour pressure (PT) of the test substance by the isothermal thermogravimetric effusion method (results are archived in the raw data). The weight loss curves of the test substance during the isothermal intervals were not lineair. This was due to reaction and/or decomposition of the test substance. Therefore, the vapour pressure could not be determined by the isothermal thermogravimetric effusion method.

GLP compliance:

yes (incl. QA statement)

Type of method:

other: Modified Watson Correlation method

Temp.:

20 °C

Vapour pressure:

ca. 0 Pa

Conclusions:

The Modified Watson Correlation Calculation method was applied for the determination of the vapour pressure of Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate).
The vapour pressure of the test substance at 20°C (293K) and 25°C (298K) was:
20°C : < 6.4 × 10e-12 [Pa] (0.0000000000064)
25°C : < 2.3 × 10e-11 [Pa] (0.000000000023)

Executive summary:

The vapour pressure of Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) at 25°C (PT, 25) was determined using Modified Watson Correlation method described by Lyman¹. The boiling point of the test substance, which is required for the determination of the vapour pressure of the test substance, was calculated using Meissner's method as described by Lyman. This calculation is based on the relation of the normal boiling points with chemical type. Molar refraction (Rd), and parachor (Pa) are used as variables in the correlation. Using Meissner’s method, the boiling point (Tb) of the test substance was calculated to be 781 K.

The vapour pressure of the test substance at 20°C (293K) and 25°C (298K) was determined to be:

20°C : < 6.4 x 10^-12

25°C : < 2.3 x 10 ^-11

¹Lyman, Reehl, Rosenblatt (eds.), "Handbook of chemical property estimation methods", McGraw-Hill Book Company, 1990.

Description of key information

The vapour pressure of Calcium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) was determined by read-across fromthe close analog Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate). The Modified Watson Correlation Calculation method was applied for the determination of the vapour pressure of Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate).
The vapour pressure of the test substance at 20°C (293K) and 25°C (298K) was:
20°C : < 6.4 × 10e-12 [Pa] (0.0000000000064 Pa, reported as <0.000000001 as the field only manages 9 decimals)
25°C : < 2.3 × 10e-11 [Pa]

Key value for chemical safety assessment

Vapour pressure:

0 kPa

at the temperature of:

20 °C

Additional information

Calcium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) has a low vapour pressure and is not expected to volatilize. The selected value is the cut-off value in EUSES.