White crystals or crystalline powder

    
        
            
            
Item 
            
            
            
Standard 
            
        
        
            
            
Appearance
            
            
            
White crystals or crystalline powder
            
        
        
            
            
State of solution
            
(Transmittance)
            
            
            
Clear and colourless
            
Not less than 98.0%
            
        
        
            
            
Chloride (Cl)
            
            
            
19.11%to19.5%
            
        
        
            
            
Ammonium(NH 4 +)
            
            
            
Not more than 0.02 ﹪
            
        
        
            
            
Sulfate(SO 4 )
            
            
            
Not more than 0.02%
            
        
        
            
            
Iron(Fe)
            
            
            
Not more than 10ppm
            
        
        
            
            
Heavy metal(Pb)
            
            
            
Not more than 10ppm
            
        
        
            
            
Arsenic(As 2 O 3 )
            
            
            
Not more than 1ppm
            
        
        
            
            
Other amino acids
            
            
            
Chromatographically
            
Not detectable
            
        
        
            
            
Loss on drying
            
            
            
Not more than 0.50%
            
        
        
            
            
Residue on ignition (sulfated)
            
            
            
Not more than 0.10%
            
        
        
            
            
Assay
            
            
            
99.0 to101.0%
            
        
        
            
            
pH
            
            
            
1.0to2.0