BS 4427-6-1974
工业用三磷酸钠(三磷酸五钠)和焦磷酸钠(焦磷酸四钠)的试验方法.焦磷酸钠中焦磷酸盐含量评估
Methods of test for sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use - Estimation of pyrophosphate content of sodium pyrophosphate