The main usage:In food line, be used as saline taste agent, buffering agent,emulgent,stablizer,and beverage,syrup and milk products.In pharmaceutical industry line ,uses as intermadiate of reduce phlegom medicine ,and diuresis medicine etc. In scour industry line; it can instead of melamine sodium phosphate as a assistants of innocuous scour.As buffering agent ,also be used in cosmetic producing,chemical reagent and electroplate in noncyanogen industry .In photograph industry line using as developer.And also widely used in chemistry,metallurgy industry ,tail gas absorbing of sulfur dioxide ,the absorbance rate is 99%,then turning into liquid sulfur dioxide sodium citrate and cir cularly using.