White powder with lumps

    
        
            
            
Item
            
            
            
Standard
            
        
        
            
            
Appearance
            
            
            
White powder with lumps
            
        
        
            
            
State of solution
            
(Transmittance)
            
            
            
Not less than 95.0%
            
        
        
            
            
Chloride (Cl)
            
            
            
Not more than0.1%
            
        
        
            
            
Heavy metal(Pb)
            
            
            
Not more than 10ppm
            
        
        
            
            
Arsenic(As2O3)
            
            
            
Not more than 2ppm
            
        
        
            
            
Loss on drying
            
            
            
Not more than 0.50%
            
        
        
            
            
Residue on ignition (sulfated)
            
            
            
Not more than 0.20%
            
        
        
            
            
Assay
            
            
            
98.0 to101.0%