无铰纲和牙形刺这类生物成因的磷灰石,由于高度富集稀土元素,且携带有其沉积时原始海水环境的元素地球化学特征,因此,有可能用作为研究古代沉积环境的指示性物质。然而,由于这种化石样品量较少,每颗化石样品约重几微克到十几微克,因此为了测定其中的稀土元素丰度,必须使用高灵敏的分析测试方法。最近,Chen等人报道了用等离子体发射光谱法测定无铰纲化石样品中的稀土元素丰度,但这种方法所需样品量多。此外,分析前复杂的化学分离操作不仅有可能引入试剂空白,而且还必须检查化学回收是否定量。为此,我们 Apatite and conodont are the biogenetic apatites that may be used as an indicator for the study of ancient sedimentary environments due to their highly elemental geochemical characteristics that are highly enriched in rare earth elements and carry the original seawater environment upon their deposition Sexual material. However, due to the small sample size of this fossil, each fossil sample weighs a few micrograms to a few dozen micrograms, so in order to determine its abundance of rare earth elements, highly sensitive analytical tests must be used. Recently, Chen et al. Reported the determination of rare earth element abundances in the reef-free fossil samples by plasma emission spectroscopy, but this method requires more samples. In addition, complex chemical separations prior to analysis not only make it possible to introduce blank reagents, but it is also necessary to check if the chemical recovery is quantitative. For this, we