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As mentioned in the hydrolysis summary, polyphosphoric acid is hydrolysed to orthophosphate in environmental conditions. Phosphoric acid does not have a high potential for adsorption to soil. It is highly water soluble and will dissociate into hydronium cations and its conjugated base anions. Therefore direct and indirect exposure of the soil compartment is deemed irrelevant. Phosphoric acid will infiltrate and migrate downward due to its high water solubility. In the process it can dissolve some soil materials and be partially neutralized in the process. On reaching the ground table phosphoric acid will be dispersed and diluted. Furthermore inorganic phosphate fertilizers (containing Na+, K+ and PO4-ions) are often added to soils to improve soil quality. Given the extensive use of inorganic phosphates as soil fertilizers and the natural occurrence of the ions in the environment it is unlikely that inorganic phosphates of this nature would have a detrimental effect on soil invertebrates. Therefore toxicity studies on soil macroorganisms, terrestrial arthropods, terrestrial plants and soil microorganisms are scientifically unjustified.