metafosfaten

Metaphosphates are a class of chemical compounds that are salts or esters of metaphosphoric acid. Metaphosphoric acid itself has the empirical formula HPO3, but its structure is more complex, often existing as a cyclic trimer or tetramer, or as long polymer chains. Consequently, the term "metaphosphate" can refer to a variety of structures. Inorganic metaphosphates typically consist of a chain of phosphate tetrahedra linked by sharing oxygen atoms. Examples include sodium metaphosphate (NaPO3) and potassium metaphosphate (KPO3). These compounds often exhibit properties related to their ability to form glassy structures and their solubility in water. Organic metaphosphates are esters where the hydroxyl groups of metaphosphoric acid have been replaced by organic groups. These are less common than their inorganic counterparts. Metaphosphates have various industrial applications, including use as food additives (e.g., as sequestrants or emulsifiers), in detergents, and in water treatment. Their ability to bind metal ions is a key property for many of these uses.