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Chelation

Formation of soluble complexes with metal ions

From a chemical-physical point of view, Phosphonates differ from carboxylic complexing substances owing to the simultaneous presence of two negative charges on each functional unit.

This "bi-functionality" provides to each phosphonic group the capability of acting independently as sequestering agent.

From an applicational view point , this properly becomes highly important complexing agents are to be used in an oxidizing medium ( i.e.H2O2)

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