phosphates: Salts based formallyon phosphorus(V) oxoacids and inparticular salts of phosphoric(V)acid, H3PO4. A large number of polymericphosphates also exist, containingP–O–P bridges. These are formedby heating the free acid and its saltsunder a variety of conditions; as wellas linear polyphosphates, cyclic polyphosphates and cross-linkedpolyphosphates or ultraphosphatesare known.
농업용
Salts based on phosphorus (V) oxyacids with alkali or
metal oxide, and in particular, salts of phosphoric or
orthophosphoric acid (H3PO4) are called phosphates.
There also exist many polymeric phosphates containing
P-O-P bridges formed by heating free acid and its salts
under a variety of conditions. The fused and noncrystalline
phosphate products are available for use in
fertilizers, as are linear polyphosphates, cyclic
polyphosphates and cross-linked polyphosphates or ultra
phosphates.
Phosphates are applied to the soil as phosphatic
fertilizers to supply phosphorus to crops. Certain
organic phosphates are used as insecticides.
Safety Profile
Alkali metal phosphates are strong caustics and therefore powerful irritants. Superphosphate is Ca(H2po4)2/CaS04. Triple superphosphate contains P2O5. Both are used as ferulizers. Organophosphates are often hlghly toxic pesticides. For an example of organic phosphates, see PARATHION. See also indvidual phosphates.
