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No terrestrial toxicity studies have been performed on diammonium dihydrogenpyrophosphate for the following reasons:

Diammonium dihydrogenpyrophosphate will ultimately breakdown to give phosphate and ammonium ions (as detailed in section 5.1 and 5.2 of this dossier). Both phosphate and ammonium are ubiquitous in the environment and are found naturally in soil, water and sediment. Diammonium dihydrogenpyrophosphate will dissociate to the ionised ammonium ion (NH4 +) which is not considered to be toxic in the environment.

Ammonia is not expected to adsorb to soil particulate matter, suspended solids or sediment. Although ammonia is assimilated by aquatic plants for use as a nitrogen source, its bioaccumulation in biota is not important. It is therefore unlikely that diammonium dihydrogenpyrophosphate would have a detrimental effect on soil microorganisms and hence toxicity studies are scientifically unjustified.