Determination of iron in vanadium-aluminum alloy by phenanthroline spectrophotometry
SU Yang
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, China)
Abstract：There are some problems during the determination of iron in vanadium-aluminum alloy by phenanthroline spectrophtometry, for example, the sample is difficult to be dissolved, and the high-content vanadium can interfere with the determination of iron. The samples were dissolved using the mixture of nitric acid and hydrochloric acid. After sulfuric acid fuming to remove nitrogen oxides, hydroxylamine hydrochloride was added to reduce vanadium (V) to vanadium (IV). Under boiling water bath conditions, the acetic acid-ammonium acetate buffer solution was added to eliminate the interference of vanadium (IV). Thus the determination of iron in vanadium-aluminum alloy with high content of vanadium was realized. The results showed that the Lambert-Beer′s law was obeyed for iron in coloring solution within mass concentration in range of 0-1.2μg/mL. The linear correlation coefficient of calibration curve was R2=0.9998. The low limit of determination was 0.005%. The proposed method was applied for the determination of iron content in vanadium-aluminum alloy. The relative standard deviation (RSD, n=8) was less than 3%. The recoveries were between 98% and 103%. The content of iron in four vanadium-aluminum alloy samples was determined according to the experimental method and DB51/T 2038-2015 Vanadium-aluminum alloy-Determination of 15 impurity elements such as silicon and iron-Inductively coupled plasma atomic emission spectrometry. The determination results of two methods were consistent.
苏洋. 邻菲罗啉光度法测定钒铝合金中铁[J]. 冶金分析, 2019, 39(2): 77-80.
SU Yang. Determination of iron in vanadium-aluminum alloy by phenanthroline spectrophotometry. , 2019, 39(2): 77-80.
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