锑对稀土元素基体效应的研究 摘要 通过ICP-AES研究样品中锑对稀土元素的影响,测定了不同浓度(0-1000ppm)下锑对试液密度、粘度的影响,研究了锑对等离子体激发温度、Ha线半宽度及对MgⅡ/MgⅠ强度比的影响。结果表明,在0-1000ppm浓度的Sb基体下,同一观测位置的激发温度差别不大。稀土元素谱线强度的测定显示,Sb对稀土元素(La、Y、)无显著的抑制作用,对稀土元素(Eu、Nd、Yb)有一定的抑制作用,随着基体浓度的增加,元素(La、Y、)的发射强度并无明显的变化,元素(Eu、Nd、Yb)的发射强度有一定的衰减。由此推断Sb不同于另外一种两性元素AL,会与稀土元素在高温条件下形成难熔和难挥发的稀土酸盐类化合物,从而对稀土的测定产生明显的基体效应。 关键词 基体效应,锑,稀土,电感耦合等离子体光谱分析 Abstract: The effect of Antimony, namely solution density and viscosity in different Antimony concentration, plasma excitation temperature, half peak width of Ha and the intensity ratio of MgⅡ/MgⅠ, was discussed with the utility of ICP-AES. The work presented shows that at the variety of Antimony concentration, the excitation temperature in the same location is of little difference, and the intensity of some rare earth elements(REEs),namely La and Y, is not significantly suppressed, while some REEs(Eu, Nd and Yb,etc) do attenuate, which deduces that the chemical properties of Antimony is quite different from that of Stibium, with significant matrix effect on the determination of REEs by forming refractory and non-volatile rare earth aluminate. Keywords: matrix effect, Antimony, rare earth elements, ICP-AES
表1 不同浓度锑基体对样品物理性质的影响 Table 1. Physical properties of sample solution in different Antimony concentration Sb
(mg/L) 粘度 V iscosity (10-3Pa.s) 密度 D en sity (g/mL) 提升量 U p take ra er (mL/min) 50 0.92231 1.0117 1.50 100 0.92895 1.0138 1.49 250 0.94566 1.0181 1.49 500 0.95761 1.0255 1.51 1000 0.97533 1.0373 1.50
参考文献 1 Xin Rengxuan(辛仁轩),Wang Jianchen(王建晨).Chinese Jou mal of Analytical Chem istry(分析化学),2005, 33(2): 251~253 2 Oza D H,Greene R L,Kelleher D H. Physical Review A,1988,37(2):531~536 3 Xin Rengxuan(辛仁轩),Tang Yaping(唐亚平). Chinese Jou mal of Analysis Laboratory(分析试验室),2002, 21(6)73~76 4 Su Qiang(苏锵). Rare Earths Chem isty(稀土化学). Zhengzhou(郑州):Henan Science and Technology Press(河南科技出版社),1993: 160