首页|Insights about inductively coupled plasma optical emission spectroscopy interferences of major rare earth elements in complex e-waste feeds

Insights about inductively coupled plasma optical emission spectroscopy interferences of major rare earth elements in complex e-waste feeds

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  • NSTL
  • Elsevier
The advent of rare earth elements (REEs) with optoelectronic properties has shifted the technology paradigm from digital to a smart and hybrid world. Their substantial uses also resulted in a large piling up of e-waste. Therefore, e-waste is now a lucrative recycling target for the recovery of such critical raw materials. Their recycling from e-waste is often challenged by dilute metal concentration, complex composition, and difficult chemical characterisation. Generally, the characterisation of e-waste involves elemental determination techniques, such as inductively coupled plasma optical emission spectroscopy (ICP-OES) or inductively coupled plasma mass spectrometry (ICP-MS). ICP-OES is attractive for a recycling or research sector because it has a higher matrix tolerance and lower cost than ICP-MS. In this work, the intensity at 445 line positions measured by an ICP-OES instrument was compiled in a 2D diagram to map interferences by 27 prominent lines from 9 REEs. The second diagram shows the impact at 230 neighbouring line positions measured in each of, in total, 17 (i.e., 9 REEs and 8 non-REEs) single-standard solutions in terms of the concentration of the element type affected. The spectral interference correction algorithm proposed here had been developed by us for a recycling process to obtain pure Y, Eu, and Tb from fluorescent powder (FP) in spent lamps. The ICP-OES analysis and spectral interference correction approach presented here can be applied to any element and e-waste type. To underline this, the paper gives examples for elements in dissolved FP and surrogate NdFeB magnet samples.

Rare earthsE-wasteInductively coupled plasma optical emissionspectroscopySpectral interferencesMethod developmentMUTUAL SPECTRAL INTERFERENCESFLUORESCENT LAMP WASTEMASS-SPECTROMETRYSTATISTICAL EVALUATIONNDFEB MAGNETSRECOVERYLIQUIDDISSOLUTIONEXTRACTIONSEPARATION

Patil, Ajay B.、Tarik, Mohamed、Schuler, Albert J.、Torrent, Laura、Struis, Rudolf P. W. J.、Ludwig, Christian

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Paul Scherrer Inst

2022

10.1016/j.sab.2022.106399

Spectrochimica Acta

Spectrochimica Acta

ISSN：0584-8547
年,卷(期)：2022.191
  • 4
  • 41