项      目

指   标

焦磷酸钠 (以 Na4P2O7计)含量                   %                  ≥          

96.5~100.5

水不溶物含量                                                %                 ≤

0.20

砷(As)含量                                                     %                 ≤

0.0003

重金属含量(以Pb计)                                     %                 ≤

0.0010

氟(F)含量                                                       %                 ≤

0.005

PH值(10g/L溶液)

9.9~10.7

正磷酸盐

通过实验

灼烧减量                                                        %                ≤

0.50

外观

白色粉末