Aluminium ammonium bis(sulphate)

Water solubility

Description of key information

Solubility values from litterature (expressed as aluminium ammonium (bis)sulfate hydrated):
at 20°C = 112 g/L (mean of 5 data; SD = 12 g/L)
at 25°C = 120 g/L (mean of 2 data)

Key value for chemical safety assessment

Water solubility:

107 g/L

at the temperature of:

20 °C

Additional information

Eight litterature references were found, none of which being sufficient enough to be assigned as a key study, but providing consistent results. As original values are expressed in different units, they will be converted below in g/L expressed as hydrated ammonium aluminium sulfate, to allow comparison:

Hostomska 2006: 11.5 %m/m at 25°C eq. to 121 g/L

Nyvlt 2001: 11.19 mass% at 25°C eq. to 118 g/L

Zuziova 1995: 5.2 mass% at 20°C eq. to 104 g/L

Mullin 1982: at 20°C 104.6 g/L

(Baikowski) internal CofA 2009: 110 g/1L at 20°C eq. to 103 g/L

Ullmann 1985: at 20°C 117 g/L

Drugs handbook 2002: 14.3g/100mL at 20°C eq. to 132 g/L

HSDB 2005: (T not specified) 130 g/L

(conversion were made assuming MW of 237.1, 453.3 and 906.6 g/mol for the ammonium aluminium sulfate, expressed as anhydrous, 12 H₂O and 24 H₂O (double salt) respectively; density of the saturated solution was taken from Mullin 1982, i.e. 1.0464 g/cm³ at 20°C; the value of 1.054 g/cm³ at 25°C was interpolated as the mean of density at 20°C and at 30°C (1.0613 g/cm³); density of the solid is the key value retained under point 4.4 unless a value is provided in the same source than solubility).

The arithmetic mean of the five results at 20°C will be retained as the key value. The mean at 25°C is provided for information. The HSDB value will not be considered as temperature is not specified, but the magnitude of order is consistent with the previous data.