磷酸

Specifications: MAIN CONTENT, AS H3PO3 MIN 98.5% P2O5 MIN 80% IRON, AS Fe MAX 0.005% CHLORIDE, AS Cl MAX 0.02% SULPHATE, AS SO4 MAX 0.01% PHOSPHATE, AS PO4 MAX 0.6% As MAX 2mg/kg Cd MAX 4mg/kg Pb MAX 20mg/kg Cr MAX 40mg/kg Hg MAX 0.05mg/kg APPEARANCE PURE WHITHE CRYSTAL WITHOUT ODOR. Application: In industry and agricultureThe most important use of phosphorous acid is the production of phosphonates which are used in water treatment. Phosphorous acid is also used for preparing phosphite salts, such aspotassium phosphite. These salts, as well as aqueous solutions of pure phosphorous acid, have shown effectiveness in controlling a variety of microbial plant diseases, in particular, treatment using either trunk injection or foliar containing phosphorous acid salts is indicated in response to infections byphytophthoraandpythium-type plant pathogens (both within classoomycetes, known aswater molds), such asdieback/root rotanddowny mildew.Anti-microbial products containing salts of phosphorous acid are marketed in Australia as 'Yates Anti-Rot'; and in theUnited States of America, for example, aluminum salts of the diethyl ester of phosphorous acid (known generically as 'Fosetyl-Al') are sold under the trade name 'Aliette'. Phosphorous acid and its salts, unlike phosphoric acid, are somewhat toxic and should be handled carefully.As a chemical reagentPhosphorous acid is used in chemical reactions as areducing agentthat is somewhat less vigorous than the relatedhypophosphorous acid.