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Environmental fate & pathways

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Diphosphoric acid, compound with 1,3,5-triamine (1:2) is not stable in the environment. The substance will dissociate in aqueous environments forming melamine and pyrophosphate ions, respectively. The pyrophosphate ions will ultimately be hydrolysed to orthophosphates. Orthophosphates and melamine ions are stable to hydrolysis since they do not contain any chemical groups subject to hydrolysis. Thus abiotic degradation is no relevant degradation pathway for both dissociation products. Biodegradation is only relevant for the organic component melamine. However, an available test on the ready biodegradability of melamine observed no biodegradation under test conditions but rapid degradation by adapted activated sludge was demonstrated for melamine.