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在原子吸收光谱法中,以空气、乙炔火焰测定稀土化合物中的钙、镁、锶是一个很方便的方法,因而详细讨论稀土元素对这儿种碱土金属的干扰是十分必要的。报道过空气、丙烷火焰中镧、钇、钕、铕对镁的干扰,刘文华等讨论了利用空气、乙炔火焰在四种酸介质中15种稀土元素对钙、镁等八种常见元素的影响。本文主要研究了镧、钇、铕对锶的影响。结果表明:(1) 镧、钇、铕都使锶的吸光度有不同程度的明显增加;(2)同一浓度的镧、钇或铕对不同含量锶的影响是一致的;(3)选择适当的测量高度可减小甚至完全消除稀土对锶的影响。
In atomic absorption spectrometry, the determination of calcium, magnesium and strontium in rare earth compounds by air and acetylene flame is a very convenient method. Therefore, it is necessary to discuss in detail the interference of rare earth elements to the alkaline earth metals here. The effects of lanthanum, yttrium, neodymium and europium on magnesium in propane flames were reported. Liu et al. Discussed the effects of 15 kinds of rare earth elements on the common elements such as calcium and magnesium in air and acetylene flames in four kinds of acid media. This article mainly studies the influence of lanthanum, yttrium and europium on strontium. The results show that: (1) Lanthanum, yttrium and europium make the absorbance of strontium increase obviously; (2) The influence of the same concentration of lanthanum, yttrium or europium on strontium is consistent; (3) Measuring height can reduce or even completely eliminate the effect of rare earth on strontium.