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Vapour pressure

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Description of key information

The test substance is an aqueous solution in 40 % acetic acid. Basic Yellow 28 Acetate is only stable in presence of significant concentrations of free acetic acid; it can not be isolated as such. 
The acetic acid solution has the more relevant vapour pressure with 20.79 hPa at 25 ˚C than Basic Yellow 28 acetate. The vapour pressure of Basic Yellow 28 methyl sulfate is 3.3E-7 hPa at 25 °C; hence only the acetic acid is inhalable as its vapour pressure is 20.79 hPa at 25 ˚C.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the methyl sulfate salt of Basic Yellow 28 is

 T (°C)
 p (hPa) p (Pa) 
 20 1.63 x 10-07  1.63 x 10-05
 25  3.30 x 10-07 3.30 x 10-05 
 30  8.05 x 10-06 8.05 x 10-04

The vapour pressure of Basic Yellow 28 methyl sulfate is 3.3E-7 hPa at 25 °C; hence only the acetic acid is inhalable as its vapour pressure is 20.79 hPa at 25 °C.