GB1608-97	China pharmacopoeia 1990 edition	Britain pharmacopoeia BP2000
Potassium permanganate % >	99.30	99.30	99.30
Chloride and Chlorate   % <	0.01	0.06	0.02
sulfate % <	0.05	0.04	0.05
Matter undissolved in water% <	0.20		1