Determination of Phosphoric Acid Content in Polyphosphoric Acid below 115％by Automatic Potentiometric Titration
In this method,the polyphosphate less than 115％is heated and hydrolyzed into positive phosphoric acid,the standard titration solu-tion of sodium hydroxide with known concentration is titrated on the automatic potentiometric titrator,and the titration curve is recorded by the automatic potentiometric titrator and the phosphoric acid content is calculated according to the volume of sodium hydroxide consumed at the two inflection points on the curve.Compared with gravimetric method,this method has the advantages of simple analysis process,rapid analysis,high accuracy and low cost.
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