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Long-term toxicity to fish

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According to Column 2 waiving criteria, long term toxicity testing shall only be proposed if the CSA indicates the need to investigate further the potential effects on aquatic organisms. Hydroxylammonium nitrate is manufactured and used in closed systems and longer term exposure of aquatic organisms is therefore very unlikely.

Further more in the aquatic 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