項目

要求

色澤

白色

組織狀態(tài)

粉末或晶體 

項目

指標(biāo)

     十水合焦磷酸鈉(Na4P2O7•10H2O),w/%                                      ≥

98.0

     無水焦磷酸鈉(Na4P2O7),w/%

96.5~100.5

     正磷酸鹽

通過試驗

     pH(10g/L容液)

9.9~10.7

     砷(As)/(mg/kg)                                                                                ≤

3

     氟化物(以F計)/(mg/kg)                                                                  ≤

50

     重金屬(以Pb計)/(mg/kg)                                                               ≤

10

     鉛(Pb)/(mg/kg)                                                                               ≤

4

     水不溶物,w/%                                                                                 ≤

0.2

     灼燒量(Na4P2O7•10H2O),w/%  

38.0-42.0

     灼燒量(Na4P2O7),w/%                                                                ≤

0.5

     a:灼燒減量(Na4P2O7)指標(biāo)為出廠時檢驗指標(biāo)。