Polysodium 4-amino-5-hydroxy-3-[{8-hydroxypolysulfonato-7-[{sulfonato-4-[(sulfonatophenyl)diazenyl]phenyl}diazenyl]-2-naphthyl}diazenyl]-6-[(4-nitro-sulfonatophenyl)diazenyl]naphthalenepolysulfonate

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

11-18 February 2014

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Data have been generated according to current internationally recognised study guidelines and in accordance with GLP.

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

GLP compliance:

yes (incl. QA statement)

Type of method:

static method

Temp.:

20 °C

Vapour pressure:

2 Pa

During the first test run (Run 1), curving was seen in the plot. This could be either due to decomposition or the vapour pressure not being given enough time to reach equilibrium at each test temperature.

Subsequent test runs were carried out over a smaller range of temperatures with more time allowed between each measurement taken. In Run 2, the sample was degassed over a period of 10 hours. More measurements were taken within a smaller temperature range and additional time allowed between each measurement to ensure the vapour pressure had reached equilibrium at each test temperature. After the point taken at 39.6°C curving was seen in the plot (Log P vs 1/K), this was again suspected to be due to the vapour pressure not reaching equilibrium. The following measurements were taken [58.1°C, 4 mbar], [67.6°C, 8.7 mbar] and [76.9°C, 20 mbar].

In Run 3, the sample was degassed over a period of 10 hours. Test Run 3 was carried out exactly as Run 2, with the exception of the final measurement. The sample was allowed to equilibrate overnight to obtain the final point. Measurements taken in addition to this began to lower the r2 value to determine the vapour pressure by interpolation. Additional measurements: [48.5°C, 12.4 mbar] and [58.2°C, 15.1 mbar].

Conclusions:

The vapour pressure of the substance has been measred as 2Pa at 20 °C. The substance is not volatile.

Executive summary:

The test is conducted to determine the vapour pressure of a test substance by the Static method – using a U-tube manometer according to the EU A4 test method in accordance with GLP. The vapour pressure of the substance has been measred as 2Pa at 20 °C. The substance is not volatile.

Description of key information

The test is conducted to determine the vapour pressure of a test substance by the Static method – using a U-tube manometer according to the EU A4 test method in accordance with GLP. The vapour pressure of the substance has been measured as 2Pa at 20 °C. The substance is not volatile.

Key value for chemical safety assessment

Vapour pressure:

2 Pa

at the temperature of:

20 °C