Chromate(5-), bis[4-(hydroxy-κO)-7-[2-(2-hydroxy-1-naphthalenyl)diazenyl]-3-[2-[2-(hydroxy-κO)- 3-nitro-5-sulfophenyl]diazenyl]-2-naphthalenesulfonato(4-)]-, sodium (1:5)

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Type of information:

calculation (if not (Q)SAR)

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

accepted calculation method

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Version / remarks:

Estimation method

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Version / remarks:

Estimation method

GLP compliance:

no

Type of method:

other: calculation

Key result

Test no.:

#1

Temp.:

ca. 25 °C

Vapour pressure:

0 Pa

Remarks on result:

other: estimated value (considering the substance without Chromium, nitro and sulphonate fragments)

The vapour pressure of single structure without chromium was calculated to be 6.3 x 10^-16 Pa at 25°C, using 881 K for Tb and 1.19 for m (constant).

It can be assumed that the vapour pressure of test item is in the same range or even lower than this value, because the substance consists of two units resembling the structure of the substance without nitro and sulphonate fragments and connected to each other via a Cr-atom.

Conclusions:

The vapour pressure of test item was estimated to be 6.3 * 10^-16 Pa at 25 °C

Executive summary:

The purpose of the study was to evaluate the vapour pressure of the test substance at 25°C. As the vapour pressure of a test substance was expected to be below the measurement range of the gas saturation method, a calculation method was used to determine the vapour pressure: the Modified Watson Correlation, described by Lyman et al. (1981). Based on the results of calculation, it was assumed that the vapour pressure of test item was in the range or even lower than 6.3 * 10^-16Pa at 25 °C.

Reference 2

Endpoint:

vapour pressure

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the melting point is above 300°C

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

25 °C

Additional information

The substance decomposes before melting/boiling starting at 225 °C. Thus, the study does not need to be conducted (the melting point is above 300 °C). Nevertheless an estimation of the vapour pressure of the substance is available. The calculated vapour pressure was in the range or even lower than 6.3 * 10-16 Pa at 25 °C.