DTPA is a chelate which protects nutrients against precipitation in a moderate pH-range (pH 4 - 7) similar to EDTA, but its stability is higher than EDTA's. Mainly used for nourishing plants in fertigation systems, and as an ingredient for NPKs.SpecificationProduct NameDTPA Fe ;DTPA IronMolecular FormulaC14H19N3O10FeNaMOL.W.T.468.2CAS No.12389-75-2AppearancePure primrose yellow powderFerric Content11.0%+/- 0.5%PH (1% sol)2.0-4.0Water - InsolubleNo more than 0.01%Chlorides(Cl)No more than 0.05%Sulphate (SO4)No more than 0.01%