Abstract：The determination method of total iron in iron ore using ascorbic acid as reducing titrant was development. The end point of titration was determined by full-automatic potential titrimeter. The titration acid medium and acidity, temperature, and potential titrimeter parameters were optimized. The influence of interference elements was tested. The results showed that titration of total iron could be carred out in the medium and acidity of dissolving iron ore samples without pH adjustment. The titration temperature range was 50 -80 ℃. The hydrogen peroxide or ammonium persulfate was used as pre-oxidant. Since the excessive pre-oxidant could be removed by boiling for a few minutes, the operation was easy. The majority elements in iron ores did not interfere in the determination, especially the tolerant amount of copper, molybdenum and vanadium could be up to 5 % (mass fraction). The relative standard deviation (RSD) of determination results was less than 0.2 %, and the recoveries for two samples were 99.6% and 100.4 %，respectively.
戚淑芳*，张杰，王莹，宁松. 以抗坏血酸作还原滴定剂电位滴定法测定铁矿石中全铁[J]. 冶金分析, 2011, 31(5): 63-66.
QI Shu-fang*，ZHANG Jie，WANG Ying，NING Song. Determination of total iron in iron ore by potentiometric titration with ascorbic acid as reducing titrant. , 2011, 31(5): 63-66.
