鎖状縮合リン酸塩の重合度測定の一つの試み

リン酸塩の工業分析法の検討(第1報)

抄録

Since condensed chain phosphoric acids have a titratable strong-acid hydrogen for each phosphorus atom and a titratable weak-acid hydrogen corresponding only to terminal phosphorus atoms, the average number of phosphorous atoms per chain (polymerization degree) can be calculated from titrant volume consumed for two inflexion points on pH titration curve.
In the determination of polymerization degree of chain polyphosphates, pH titration was carried out after phosphates had been changed to acid type by ion exchange resin. The values obtained by this method showed a good agreement with those calculated from chemical analysis of Na/P.
The method will be applicable to routine analysis for production control of chain polyphosphates.