Tuesday, March 13, 2012


A metaphosphate is a salt or an ester of metaphosphoric acid, HPO3. Metaphosphates are condensation products of orthophosphoric acid (see phosphoric acid description) (H3PO4) with the sum formula (M'PO3) n. (M': univalent cation). In contrast to polyphosphates, metaphosphates store themselves to ring molecules together. As example the 6-Ring of the trimetaphosphate is represented.

Tetrametaphosphates form a similar 8-Ring.

Trimetaphosphates were used in former times in detergents; today due to the fertilization effect of the phosphates zeolites (stand silicates, as e.g. zeolite A) are used.


Zeolite: Any one of a family of hydrous aluminum silicate minerals, whose molecules enclose cations of sodium, potassium, calcium, strontium, or barium, or a corresponding synthetic compound, used chiefly as molecular filters and ion-exchange agents.



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