Determination of bismuth in iron ore by alkali fusion hydride generation-atomic fluorescence spectrometry
LU Yan-rong1, YIN Ming-lan2, YANG Long-lian3
1.Technology Center of Baotou Steel Group Company,Baotou 014010,China; 2.Steel Making Plant of Baotou Steel Group Company,Baotou 014010,China; 3.Materials Supply Company of Baotou Steel Group Company,Baotou 014010,China
Abstract：The sample was fused with sodium hydroxide and sodium peroxide. After leached with hot water, the solution was acidified. Thus, a determination method of bismuth in iron ore was established by hydride generation-atomic fluorescence spectrometry. The results showed that 0.1-0.2 g of sample could be completely decomposed by heating in muffle furnace at 700 ℃ for 10 min with 2 g of sodium hydroxide and 1 g of sodium peroxide as flux. When the reduction time was 20 min and the acidity of testing solution was 0.6-1.5 mol/L, the fluorescence intensity stayed stable. The interference of Te (IV) and Ni2+ could be eliminated by adding 0.5 mL of 50 g/L sodium sulfide and 2 mL of 50 g/L citric acid into testing solution, respectively. The proposed method was applied to the determination of actual iron ore sample. The results were consistent with those obtained by alkali fusion-inductively coupled plasma mass spectrometry. The precision and recovery test of the method was conducted. The relative standard deviation (RSD,n=11) was 0.78%-1.3%, and the recoveries were between 96% and 105%.
卢艳蓉,尹明兰,杨龙莲. 碱熔融氢化物发生-原子荧光光谱法测定铁矿石中铋[J]. 冶金分析, 2014, 34(12): 57-61.
LU Yan-rong, YIN Ming-lan, YANG Long-lian. Determination of bismuth in iron ore by alkali fusion hydride generation-atomic fluorescence spectrometry. , 2014, 34(12): 57-61.
