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Physical & Chemical properties

Vapour pressure

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Description of key information

Predicted vapour pressure for 4-anilinobenzenediazonium hydrogen sulphate : 7.32 x 10^-15 Pa T = 25 °C.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

Based on the OECD TG 104, the calculated values of the vapour pressure can be used:

- for deciding which of the experimental methods is appropriate,

- for providing an estimate or limit value in cases where the experimental method cannot be applied due to technical reasons.

The estimation method proposed by the OECD TG 104 is the modified Watson correlation, for which the only experimental data required is the normal boiling point. In the DSC analysis of 4-anilinobenzenediazonium hydrogen sulphate no endothermic peak corresponding to melting and boiling points was recorded in the tested temperature range from 25 °C to 600 °C. The thermal decomposition of the test substance started at the temperature 130 °C. The boiling temperature of the test substance could not be determined because of its thermal decomposition . Therefore, the modified Watson correlation cannot be used. A prediction made by EPI Suite v. 4.11 of the US EPA by a Modified Grain method was conducted and the result of vapour pressure was 7.32 × 10^-15 Pa, at 25 °C.

The SMILES notation used for the estimation was: O=S(=O)(O)ON(#N)c2ccc(Nc1ccccc1)cc2 (unionised structure of 4-anilinobenzene-diazonium hydrogen sulphate).

The predicted value of vapour pressure is out of the recommended range of the pressures of the methods reported in the OECD TG 104 (lower than 10^-10 Pa), therefore the calculated value has been reported as key value for the assessment of ecotoxicological and toxicological properties of the substance.