Usable in metallurgy industry as precipitating and separating function for rare-earth metal. in pharmaceutical industry in Tetracycline, Oxytetracycline, Phenobarbital, and Borneol, etc.. in light industry as polishing for marble, rust-remover, bleaching, dirt-remover, leather-processing, wood, and aluminium products etc.. in dyeing and printing industry as reducing agent for dyeing and printing industry, as bleaching agent for textile, substitute for Acetic acid, as coloring mordant for fast pigment dyestuff. in organic synthetic. in electron industry for preparation of chemicals raw material for porcelain capacitor, preparation of electron equipment detergent. in other aspects as analysis reagent, raw material of chemicals.