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Environmental fate & pathways

Endpoint summary

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According to Annex XI of regulation (EC) 1907/2006, testing for a specific endpoint may be omitted if testing does not appear to be scientifically necessary or if it is technically not possible to conduct the study as a consequence of the properties of the substance. Evaluation of adsorption/desorption behaviour of ions from ammoniummagnesium phosphate is considered as not relevant for the risk assessment of this substance. After distribution in the environment it would be impossible to make a distinction between ions from ammonium magnesium phosphate and ions from other natural occuring minerals comprising magnesium and phosphate. Each deposit would be covered by the huge amount of minerals, which build the sediment in the surface water or the earth´s crust. Magnesium is the eighth most abundant element, constitutes about 2% af the Earth's crust by weight and is an essential element in biological systems, present in every cell type and organism. The most common source of magnesium in groundwater is through the erosion of rocks, such as dolomite and minerals, such as magnesite. It is found naturally in many foods such as vegetables, nuts, grains, fish and dairy products. Phosphorus can be found in the environment most commonly as phosphates. Phosphate salts that are released from rocks through weathering usually dissolve in soil water and will be absorbed by plants. Phosphorus is an essential nutrient for living organism and is a part of the DNA and of fats of cell membranes. Ammonia is found throughout the environment in the air, soil, and water, and in plants and animals including humans. Ammonia occurs naturally and is produced by human activity. Most of the ammonia in the environment comes from the natural breakdown of manure and dead plants and animals. It is an important source of nitrogen which is needed by plants and animals. Ammonia is essential for mammals and is necessary for making DNA, RNA, and proteins. In summary it is concluded that performance of a adsorption/desorption study with ammonium magnesium phosphate would provide no additional knowledge about the ecotoxicological behaviour of the substance.