Department of Analytical Chemistry, Faculty of Chemistry, University of Sofia, 1, J. Bouchier Boulevard, 1126 Sofia, Bulgaria.
Talanta. 2002 Jul 3;57(5):821-9. doi: 10.1016/s0039-9140(02)00126-1.
The influence of matrix elements such as Ba, Ca, Fe, K, Na and Ti, on the inductively coupled plasma atomic emission spectrometry determination of the rare earth elements in soils and sediments is investigated and analytical lines with minimal interferences are chosen. The analysis of certified reference materials by two calibration methods (pure rare earth solutions and IAEA-Soil 5) and after cation-exchange proved that calibrations with IAEA-Soil 5 increase the number of accurately determined rare earth elements (REE), permitting the instrumental determination of Ce, Eu, La, Nd, Tb, Yb and Y in soils and some sediments. The cation-exchange procedure permits the determination of 12 REE with very good accuracy (below 10%) and detection limits varying between 0.05 (Eu, Tb, Yb) and 0.5 (Er) mg kg(-1).
研究了基质元素（如 Ba、Ca、Fe、K、Na 和 Ti）对土壤和沉积物中稀土元素电感耦合等离子体原子发射光谱测定的影响，并选择了干扰最小的分析线。通过两种校准方法（纯稀土溶液和国际原子能机构-土壤 5）以及阳离子交换后的分析，证明使用 IAEA-土壤 5 进行校准可以增加准确测定的稀土元素数量（REE），从而可以在仪器上测定土壤和一些沉积物中的 Ce、Eu、La、Nd、Tb、Yb 和 Y。阳离子交换程序允许以非常高的精度（低于 10%）测定 12 个 REE，检测限在 0.05（Eu、Tb、Yb）和 0.5（Er）mg kg(-1) 之间变化。
