磁化TEVA树脂的制备及其表征

磁助制样可有效降低X射线荧光光谱（XRF）方法的检出限，该制样方法的核心是制备磁性分离材料。本工作使用共沉淀磁化的方法制备磁化TEVA树脂作为磁性分离材料。该材料可用于磁助制样/XRF分析后处理样品中的微量锝。通过扫描电镜、X射线衍射（XRD）、红外等分析手段对磁化TEVA树脂进行表征，结果显示磁化树脂中铁氧化物以物理镶嵌的方式与TEVA树脂相结合，其主要成分为纳米四氧化三铁。制得的磁化TEVA树脂既保留了TEVA树脂在低酸下对TcO₄^-选择性吸附的性能，又具有顺磁性，可用于磁助制样/XRF分析方法。该制备方法重复性好，制得的磁化树脂性能稳定、良好，用于磁助制样时制样回收率大于99%，可有效降低方法的检出限。

Preparation and Characterization of Magnetic TEVA Resin

Magnetically assisted sample preparation(MASP) can effectively reduce the detection limit of the XRF. The core of MASP is magnetic carrier. In this work, the co-precipitation magnetization method had been used to prepare magnetic TEVA resin, which was used as the magnetic carrier for MASP/XRF analysis trace Tc in samples from reprocessing process. It was characterized by SEM, FTIR, XRD and other analytical methods. The results show that the iron oxide, which mainly composes of Fe₃O₄, is physically embedded with resin. The prepared magnetic TEVA resin retains the selective adsorption of TEVA resin to perrhenate under low acid and has paramagnetic properties, which can be used for MASP/XRF analysis. The preparation method has good repeatability. The obtained magnetic resin has stable and good performance. The sample recovery rate for MASP is more than 99%, which can effectively reduce the detection limit of the method.