Registration Dossier
Registration Dossier
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EC number: 215-100-1 | CAS number: 1302-42-7
Endpoint summary
Administrative data
Description of key information
Additional information
The emission of sodium aluminate mainly applies to (waste)water. If released into the environment, sodium aluminate will hydrolyse to aluminium hydroxide and precipitates in aquatic system or deposits as aluminium oxide in sediment or soil. Sodium will be found dissociated as sodium ion predominantly in water.
The air compartment is considered not relevant for sodium aluminate. If emitted to air as an aerosol in water, sodium aluminate will be rapidly neutralised as a result of its reaction with CO2(or other acids), as follows:
NaAlO2 + 2H2O + CO2 → Al(OH)3↓ + HCO3 - + Na+
Subsequently, will be washed out from the air. Thus, atmospheric emissions of neutralised sodium aluminate will largely end up in soil and water.
A direct emission of sodium aluminate to surface water may increase the pH, depending on the buffer capacity of the water, whereas through the dilution, sodium aluminate will be hydrolysed and precipitation of aluminium hydroxide will occur. In acidic aquatic systems, aluminium exists in natural waters as a number of species, including dissolved and particulate forms. This again depends on many factors, especially pH, alkalinity, temperature, dissolved organic carbon, dissolved inorganic carbon and anion concentration. Furthermore, hydrolysis of aluminium ions has two possible “directions” towards a neutral pH, i.e. base hydrolysis and acid hydrolysis. Both acid and base hydrolysis of aluminium rapidly results in precipitation of aluminium hydroxide, which can become adsorbed on suspended particles or immobilised in sediment.
As mentioned above, a direct release of sodium aluminate to terrestrial environment is negligible. If emitted to soil, depending on the buffer capacity of the soil, sodium aluminate will be neutralised and decomposes to aluminium hydroxide or oxide (gibbsite), which are stable and can become immobilised in soil. Nevertheless, the fate of aluminium in the terrestrial environment will also depend on local conditions.
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