项目

指标

二水磷酸二氢钠

无水磷酸二氢钠

磷酸二氢钠(NaH2PO4·2H2O),w/%                                          ≥

98.0

   (NaH2PO4)(干基计),w/%                                                          ≥

98.0

水不溶物,w/%                                                                           ≤

0.10

0.20

铁(Fe),w/%                                                                               ≤

0.05

0.05

砷(As),w/%                                                                               ≤

0.01

0.01

硫酸盐(以SO4计),w/%                                                             ≤

0.5

0.5

氯化物 (以Cl计),w/%                                                              ≤

0.40

0.40

pH(10g/L溶液)                                                                          

4.2~4.6

4.2~4.6

氟(F),w/%                                                                                 ≤

0.05

0.05

干燥减量(NaH2PO4),w/%                                                       ≤

—

2.0