ITEM	STANDARD
Hazen(Hazen unit; Platinum-cobalt scale)	10	20	30
CH3COOH  %≥	99.8	99.5	99.0
Water      %≤	0.15	0.20	0.50
Formic acid   %≤	0.05	0.10	0.30
Alde Hyde   %≤	0.03	0.05	0.10
Evaporation residue %≤	0.01	0.02	0.03
Iron (Fe)  %≤	0.00004	0.0002	0.0004
Time of reduced potassium permanganate min≥	30	5	2