作废
BS 4427-15-1982 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.第15部分:工业(包括食品)用缩聚磷酸盐.氧化物中氮含量的测定,3,4-二甲苯酚分光光度法Methods of test for sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use - Condensed phosphates for industrial use (including foodstuffs) - determination of oxides of nitrogen content