产品描述
  Appearance	White crystalline powder
Purity	>= 99.0%
Melting point	125- 128
Residue on ignition	=< 0.1%
Acidity (mg/g)	4.0- 7.0
Related substances	=< 0.5%
Identification	Conform
Clarity of solution	Clear and transparent
Heavy metal (as Pb)	=< 10 ppm