College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, 430023, People's Republic of China.
College of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, 430023, People's Republic of China.
Mikrochim Acta. 2019 Mar 8;186(4):228. doi: 10.1007/s00604-019-3342-8.
Magnetic ZnFeO nanotubes (ZFONTs) with numerous pores on their walls were synthesized and characterized. They are shown to be a viable sorbent for dispersive micro-solid phase extraction of the trivalent ions of rare earth elements (REEs), specifically of lanthanum, praseodymium, europium, gadolinium, holmium and ytterbium. The specific surface area of ZFONTs is large (57 m⋅g) and much bigger than that of ZnFeO nanoparticles (16 m⋅g). It is shown that REEs are quantitatively retained on ZFONTs in the pH range of 7.0-9.0. The separation of the sorbent from the aqueous phase was achieved by an external magnetic field. Following elution with 0.5 mol⋅L HNO, REEs were quantified by inductively coupled plasma mass spectrometry. The main parameters influencing preconcentration and determination of the REEs were studied. Under optimum conditions, detection limits for REEs range from 0.01 (Ho) to 0.75 (La) pg⋅mL. Relative standard deviations are less than 6.5% (for n = 9; at 1.0 ng⋅mL). The method was applied to the determination of trace REEs in spiked biological and environmental samples and gave satisfactory results. Graphical abstract Schematic presentation of a new adsorbent for dispersive micro-solid phase extraction (DMSPE) combined with ICP-MS. Magnetic ZnFeO nanotubes with many pores on their walls were used for preconcentration and determination of rare earth elements (REEs) in environmental and biological samples.
具有多孔壁的磁性 ZnFeO 纳米管（ZFONTs）已被合成和表征。它们被证明是一种可行的分散固相微萃取（DMSPE）吸附剂，可用于萃取三价稀土元素（REEs），特别是镧、镨、铕、钆、钬和镱。ZFONTs 的比表面积大（57 m⋅g），远大于 ZnFeO 纳米颗粒（16 m⋅g）。研究表明，在 pH 值为 7.0-9.0 的范围内，REEs 可定量保留在 ZFONTs 上。通过外加磁场实现吸附剂与水相的分离。用 0.5 mol⋅L HNO3 洗脱后，采用电感耦合等离子体质谱法（ICP-MS）定量测定 REEs。研究了影响 REEs 预浓缩和测定的主要参数。在最佳条件下，REEs 的检测限范围为 0.01（Ho）至 0.75（La）pg⋅mL。相对标准偏差小于 6.5%（n=9；1.0 ng⋅mL）。该方法已应用于加标生物和环境样品中痕量 REEs 的测定，结果令人满意。
