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Environmental fate & pathways

Endpoint summary

Administrative data

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Additional information

The substance has been tested according OECD 301B with a concentration of the test item exceeding the solubility limit by the factor 16. Practically no indication of biodegradation was observed.

For the component 108 -78 -1(melamine):

Test results of a MITI test for ready biodegradability, 3 Zahn-Wellens assays for inherent biodegradability and 2 studies on Biochemical Oxygen Demand are reported. The individual results of the studies are consistent: Melamine is not readily biodegradable and also not inherently biodegradable.

With activated sludge taken from an industrial waste water treatment plant as the inoculum, a degradation of DOC of up to 16 % was observed within 20 d (Pagga 1991). A rapid and complete primary degradation of the molecule within 8 h was detected with an activated sludge taken from an industrial waste water treatment plant from a producer of melamine (Fimberger 1997). Addition of glucose, in the absence of NH4+, enables the microorganisms to use melamine as the only nitrogen source (Fimberger 1997). Degradation occurs by hydrolytic deamination to ammeline, ammelide and cyanuric acid, and lastly to CO2 and NH4+ (Fimberger 1997).

For the component 108 -80 -5 (cyanuric acid):

The component is neither readily nor inherently biodegradable.