一、前言在工业品三聚磷酸钠中。一般均含有正、焦、偏等磷酸盐。因此,在测定时,就必须用较复杂的手续逐一地把它们分离出来。有关三聚磷酸钠的定量分析方法,据文献介绍有:L.T.Jones法,锌盐法,水解法、钴盐法、红外光珊衍射法和同位素稀释法等。我们曾对L.T.Jones法,锌盐法以及水解法进行过试验。认为:后两法不易掌握,而L.T.Jones法经过改进以后,比较适用。如用钼酸铵容量法测定磷酸根步骤中,我们改用柠檬酸-钼 First, the preface In the industrial sodium tripolyphosphate. Generally contain positive, coke, partial phosphate and other. Therefore, in the measurement, it must be more complex procedures to separate them one by one. About the method of quantitative analysis of sodium tripolyphosphate, according to the literature are introduced: L.T. Jones method, zinc salt method, hydrolysis, cobalt salt method, infrared light Shan diffraction and isotope dilution method. We have tested the L.T. Jones method, the zinc salt method, and the hydrolysis method. That the latter two methods is not easy to grasp, and L.T.Jones method after the improvement, more applicable. As with the ammonium molybdate volume determination of phosphate step, we use citric acid - molybdenum