Methodologies and Developments in the Analysis of REEs

Abstract

This is a repository copy of Methodologies and developments in the analysis of REEs.

Synthesis of Crystallographically Characterizable Bis(cyclopentadienyl) Sc(II) Complexes: (C5H2tBu3)2Sc and {[C5H3(SiMe3)2]2ScI}1–

“…Magnetic moments were determined by Evans’ method and corrected using the appropriate diamagnetic constants. − CHN analysis was performed at the UC Berkeley Microanalytical Facility. Scandium metal content was determined by complexometric titration of hydrolyzed samples with Na 2 EDTA solution using xylenol orange as an indicator. − Scandium iodide was prepared from scandium metal and ammonium iodide in a modification of the procedure described by Meyer et al KCp ttt was prepared according to the literature procedure . Cp* 2 ScI , and Cp ″ 2 ScI 42 were prepared from the reaction of KCp* or KCp ″ with ScI 3 in toluene analogously to 1 below and identified by their 1 H NMR spectra.…”

X-ray fluorescence spectrometry for environmental analysis: Basic principles, instrumentation, applications and recent trends

“…Finally, it is also important to mention the increasing interest in the determination of rare earth elements (REEs) in geological materials in view of the wide range of industrial applications of these elements including manufacturing of phones, computers and wind turbines. In this sense XRF has been proved to be a potential analytical technique for such purpose (Batchu and Regadío, 2019). However, the quality of the obtained results depends on the choice of the sample preparation method, the measurement conditions, the calibration strategy and also the proper selection of the analytical lines, in view of the sever overlapping issues of REEs characteristic X-ray lines with those from other major elements present in the geological materials (Schramm, 2016).…”