Registration Dossier
Registration Dossier
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EC number: 237-415-3 | CAS number: 13776-88-0
Endpoint summary
Administrative data
Description of key information
Additional information
Aluminium metaphosphate (CAS 13776-88-0) is an inorganic phosphate substance. Biotic degradation is therefore not relevant for the substance. Furthermore abiotic degradation processes like photolysis in air, water and soil are not likely. In water, soil and biological systems, dissolved aluminium metaphosphate dissociates to phosphate and aluminium ions. In all environmental compartments aluminium and phosphorus are present in the most stable oxidation states (as Al+3 and P+5). Both ions do not undergo oxidation-reduction transformation under normal environmental conditions. Removal of aluminium and phosphorous from environment compartments is a function of abiotic transformation and chemical cycling, e.g. hydrolysis, precipitation, suspension, leaching, up taking and releasing of animals and plants, etc.
As elements aluminium and phosphorus are persistent in environment. Aluminium can participate in hydrolysis reactions, thereby forming a number of monomeric and polymeric Al-hydroxyl species and this process is highly dependent on pH. At the neutral pH in the range of 5 and 8 aluminium forms dominantly insoluble aluminium hydroxides that precipitate out of solution. Triphosphates hydrolyses into smaller phosphates in aqueous solutions and finally into orthophosphate. This process is usually quite slow and could accelerate under acidic condition. Orthophosphate is available for biological metabolism without further breakdown. Besides of chemical precipitation phosphate can be biologically removed from waste water. Biological phosphate removal process is relies upon microorganisms to uptake phosphate into their cells either via anaerobic or anaerobic pathways, which is subsequently removed from the STP process as a result of sludge wasting.
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