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Item                              Standard                        Result

1)Appearance  A soft, white or faintly yellowish-white, amorphous powder  confirm

 2)Assay % m/m                    99.0~100.5                        99.82

3)Identification                  Positive reaction                Positive reaction

4)Alkalinity    Add 0.1ml of phenolphthalein solution to the

              mixture solution,filtered,,add hydrochloric acid to          confirm

change the red colour to the indicator.                                                 

5)Carbonates and substances           <=0.006                         0.002

insoluble in acids %                 

6)PbO(tested in Pb) %                <=0.005                         0.002

7)Heavy metal(tested in Zn) %          None                           None

8)MnO(tested in Mn) %               <=0.0001                        0.0001

9)CuO(tested in Cu) %                <=0.0002                        0.0002

10)As %                            <=0.0005                        0.0004

11)Cd %                            <=0.001                         0.0006

12)Loss on ignition % m/m             <=0.2                           0.1

13）Water dissoluble%                <=0.1                           0.08

14)105℃ volatile substances            <=0.3                            0.2