Determination of ferric iron and ferrous iron in blast furnace slag by EDTA complexometric titration
WANG Yong,ZHANG Yuan-qin,DAN Juan,SHI Zong-you
Product Quality Supervision and Testing Institute of Panzhihua,National Quality Supervision and Testing Center of Vanadium and Titanium Products,Panzhihua 617000,China
Abstract：With sample dissolved in hydrochloric acid, the ferric iron was titrated by EDTA with sulfosalicylic acid as indicator under the protection of shielding gas carbon dioxide and at the controlled temperature of (75±2) ℃ and pH of 1.5-2.0; then, ammonium persulfate was added to oxide the ferrous iron into ferric iron and the generated ferric iron was determined by EDTA so that the content of ferrous was obtained by subtracting MFe. The influence of experimental conditions such as system temperature, pH value and the selection of environmental protection on the determination were discussed. The proposed method was applied to the determination of ferric iron and ferrous iron in a blast furnace slag sample. The relative standard deviations (RSD,n=5) of the results were 0.76%-2.3%. Using the proposed method to detect three blast furnace slag samples, the results were in agreement with those of orthophenanthroline spectrophotometry.
王勇, 张远琴, 但娟, 施宗友. EDTA络合滴定法测量高炉渣中铁(Ⅲ)和铁(Ⅱ)[J]. 冶金分析, 2017, 37(8): 49-53.
WANG Yong,ZHANG Yuan-qin,DAN Juan,SHI Zong-you. Determination of ferric iron and ferrous iron in blast furnace slag by EDTA complexometric titration. , 2017, 37(8): 49-53.
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