Fe3EDTA

Fe3EDTA, formally known as tris(ethylenediamine‑succinic acid) iron(III) complex, is a stable iron(III) chelate formed by coordination of the iron ion with the hexadentate ligand ethylenediaminetetraacetic acid (EDTA). In its most common representation the iron center is surrounded by six donor atoms (four carboxyl oxygens and two amine nitrogens) from a single EDTA ligand, yielding a neutral complex with the formula FeEDTA and typically a 3‑stoichiometric ratio in solution. The complex is soluble in aqueous media and exhibits a pale yellow to light brown coloration, characteristic of iron(III) complexes.

The principal application of Fe3EDTA is as a micronutrient in plant nutrition and aquaculture. By chelating iron, the compound prevents the precipitation of iron hydroxides that normally limits bioavailability of Fe³⁺ in soils and water. Fertilizers containing Fe3EDTA improve growth of iron‑deficient crops, while aquaculture feedstocks use it to enhance iron supply for larval development and metabolic processes. It is also employed as a catalyst precursor in certain synthetic organic reactions and can serve as a component in metal extraction processes from ores.

Safety considerations for Fe3EDTA reveal its relatively low acute toxicity; however, ingestion of large quantities may lead to gastrointestinal irritation. The compound is generally stable under normal storage conditions but can degrade under prolonged exposure to light and heat, releasing free iron ions. Regulatory agencies classify the substance as a mild irritant, and proper handling protocols recommend the use of gloves and eye protection during manipulation.