EDTA Tetrasodium (EDTA-4Na)

Ethylenediaminetetraacetic acid tetrasodium salt tetrahydrate (EDTA-4Na), identified by CAS number 13235-36-4, is a highly versatile and efficient sequestering agent used extensively in the global chemical industry. As a hexadentate chelating agent, EDTA-4Na possesses the unique ability to form stable, stoichiometric, and water-soluble complexes with polyvalent metal cations, such as calcium ($Ca^{2+}$), magnesium ($Mg^{2+}$), iron ($Fe^{3+}$), and copper ($Cu^{2+}$). By effectively “trapping” these metal ions, it prevents them from participating in unwanted chemical reactions, such as the formation of insoluble scales, catalytic oxidation, or the precipitation of surfactants.

The tetrasodium form is particularly valued for its high solubility in aqueous solutions and its alkaline pH profile, which enhances its performance in cleaning and detergent formulations. It remains chemically stable across a broad temperature range and maintains high sequestration capacity even in concentrated systems. This makes it an indispensable additive for maintaining product clarity, shelf-life stability, and process efficiency in environments where water hardness or trace metal contamination is a concern.