Determine FeO_4~(2-) by titration method of EDTA

Using decomposition reaction of FeO~(2-)_4 in acidic medium, a new titration method on determining FeO~(2-)_4 is established by means of sulfosalicylic acid as indicator. It is suitable for the analysis of FeO~(2-)_4 in its preparation and use process. The determination results are agreed with 1,10-phenanthroline method. It is a simple and practical method.