6.其他的化学分析法 1)只有正、焦磷酸盐共存的混合物,可用此色法测定正、焦磷酸盐。其方法是在热的钼酸盐的酸性溶液中,将焦磷酸盐水解成正磷酸盐,随即加入抗坏血酸至形成磷钼杂多兰而比色测定磷。取另一份试液不用水解而直接测定正磷酸盐。两者之差即为焦磷酸盐之量。 6. Other chemical analysis 1) Only positive, pyrophosphate coexistence of the mixture, this method can be used to determine the color, pyrophosphate. The method is to hydrolyze the pyrophosphates into orthophosphates in an acidic solution of hot molybdate, then add ascorbic acid to form phosphomolybdate and determine the colorimetric phosphorus. Take another test solution without direct hydrolysis of orthophosphate. The difference between the two is the amount of pyrophosphate.