项      目

指   标

焦磷酸二氢二钠 (以 Na2H2P2O7计)含量            %                   ≥          

95.0

水不溶物含量                                                          %                  ≤

1.0

砷(As)含量                                                               %                   ≤

0.0003

重金属含量(以Pb计)                                               %                   ≤

0.0015

氟(F)含量                                                                 %                   ≤

0.005

PH值(10g/L溶液)

4.0±0.5

外观

白色粉末