magnesiumEDTA

Magnesium EDTA refers to a coordination complex in which a magnesium ion (Mg2+) is chelated by the ligand EDTA (ethylenediaminetetraacetic acid). In solution, the complex is typically represented as [Mg-EDTA]2− with various counterions depending on the salt form. The EDTA ligand binds Mg2+ through its two amine nitrogens and four carboxylate oxygens, forming a stable, octahedral coordination around the metal ion.

The complex is highly water-soluble and its formation is favored at neutral to basic pH, where EDTA is largely deprotonated and able to coordinate Mg2+. The stability of the Mg-EDTA complex depends on pH and ionic strength, but it is generally considered a relatively strong chelate for Mg2+ in aqueous solution.

Preparation typically involves combining a magnesium salt (such as magnesium chloride or magnesium sulfate) with disodium EDTA under alkaline conditions to deprotonate EDTA and promote complex formation. Depending on the intended use, the product may be isolated as a solid magnesium-EDTA salt or used in solution as the Mg-EDTA complex.

Applications of magnesium EDTA include analytical chemistry and sample preparation, where it acts as a chelating agent to sequester Mg2+ and prevent interference from metal ions. It is also used in formulations to stabilize metal ion concentrations, in study of magnesium-binding interactions in biochemistry, and in some laboratory titrations that determine magnesium content by complexometric methods.

Safety considerations follow standard precautions for EDTA salts; they can bind essential metals, so handling should follow chemical hygiene practices and exposure should be minimized.