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5% by mass for unintentional addition. However, an official method is not available for phosphonates determination in fertilizers and approval by the European Committee for Standardization (CEN) is necessary in a short time. This review presents an overview about the chemical, biological, analytical and legislative aspects of phosphonates and aims at providing clarity on the correct nomenclature to avoid misunderstandings; the evaluation of phosphonates properties with the absence of a nutritional role, ju