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Trimagnesium bis(orthophosphate) (CAS 7757-87-1) is an inorganic substance that does not undergo biodegradation. In release to water trimagnesium bis(orthophosphate) dissociates to magnesium ions and phosphate species. The magnesium cation and the phosphate anion have no potential mechanism for further hydrolysis. Photodegradation is not relevant for the substance.