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Environmental fate & pathways

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Urea phosphate will dissociate directly into phosphoric acid and urea in aqueous environment.

Urea is stable in aqueous solution. Hydrolysis is not seen and is not predicted based on a theoretical assessment of the structure of the molecule. Urea is considered to be readily biodegradable: the substance will be rapidly degraded by microorganisms present in the environment (as a nutrient and N-source) and subsequently incorporated into the nitrate cycle. Urea is additionally utilised as a N-source by terrestrial and aquatic plants. Urea has a low potential for adsorption to soil.

Due to its high solubility in water, phosphoric acid will be dissociated into its ions (H+and mainly H2PO4- and HPO42-) at pH 3, 7 and 10. In water the H+ions will form H3O+ions. The hydrolysis endpoint can thus be waived. Due to its inorganic nature, the adsorption/desorption screening test cannot be conducted, while QSARs are not applicable for these kind of substances. Also biodegradation tests are not applicable to inorganics.

Bioaccumulation is not relevant for the highly soluble substances urea and phosphoric acid.