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Environmental fate & pathways

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No data are available. As the substance is a water soluble salt of phosphate, effects can be read-across from the cation, which is likely to have the more important effects.Inbiological systems, phosphate is an abundant in cells and body fluids.In ecological terms, because of its important role in biological systems, phosphate is a highly sought-after resource. Thus, read-across from component CAS Reg.-No. 108-78-1, melamine, is justified.

Melamine is a stable molecule.

Melamine is hydrolyzed only by mineral acid or inorganic alkali. Hydrolysis proceeds stepwise, with loss of one, two, or all three amino groups, i.e. producing ammeline, ammelide and cyanuric acid.

Melamine is not readily or inherently biodegradable. Biodegradation, also stepwise, to cyanuric acid and lastly to CO2 and NH4+ can occur in waste water treatment plants with adapted microorganisms.

No bioaccumulation is expected, as the determined bioconcentration factors in fish are <1 (only at 0.2 ppm the BCF = 3.8).

Based on the low n-octanol/water partition coefficient also the adsorption to soil or sediment is expected to be low, i.e. in the range of 1.1 to 1.5.

Some monitored data in the environment and wildlife are available from surveys in Japan, performed in earlier years.