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Toxicity to terrestrial plants

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Hydroxylammonium nitrate is manufactured and used in closed systems, and exposure of terrestrial plants to the substance is therefore very unlikely. In a moist soil environment, hydroxylammonium nitrate is expected to dissociate to [NH3OH]+ and [NO3]2-. The hydroxyl-ammonium ion is rapidly converted to hydroxylamine (free base). Hydroxylamine (free base) is stable in pure water in the absence of oxygen. However, the substance is a strong reduction agent and in the presence of oxygen, metals and other ions is rapidly transformed by abiotic processes (Hollemann-Wiberg, 1995). The ultimate transformation products are ammonium, nitrogen and N2O. The reaction is dependent on the pH. The more basic the environment, the more rapid the transformation. Reference Hollemann-Wiberg (1995): Lehrbuch der Anorganischen Chemie, de Gruyter, p. 702-704