Determination of rare earth elements and yttrium in rocks by inductively coupled plasma atomic emission spectrometry after separation by organic solvent extraction

Abstract

Solvent extraction with trioctylphosphine oxide was used for the separation of rare earth elements (REE) and yttrium (Y) from geological samples decomposed by HF plus H2S04 followed by alkaline fusion of the dry residue. The REE and Y were then measured by inductively coupled plasma atomic emission spectrometry after back-extraction into dilute HCI. Scandium, which is not back-extracted, can be measured in the organic phase. The separation procedure is more expeditious than ion-exchange chromatography.

Zinc-Adeninate Metal–Organic Framework: A Versatile Photoluminescent Sensor for Rare Earth Elements in Aqueous Systems

“…25 As a proof-ofconcept to evaluate the performance of BioMOF-100 postextraction, several REEs in water were mixed with trioctylphosphonium oxide (TOPO) in hexanes to extract the REEs into an organic phase. 29 Figure S24 illustrates the signal obtained from extracted europium and neodymium in hexanes with BioMOF-100, highlighting the versatility of this technique for REE detection post-extraction into organic solvents.…”

“…Unlike many other REE sensitizers, such as organic molecules, BioMOF-100 is dispersible in both aqueous and organic solutions, rendering it useful as an REE sensitizer both pre- and post-extraction . As a proof-of-concept to evaluate the performance of BioMOF-100 post-extraction, several REEs in water were mixed with trioctylphosphonium oxide (TOPO) in hexanes to extract the REEs into an organic phase Figure S24 illustrates the signal obtained from extracted europium and neodymium in hexanes with BioMOF-100, highlighting the versatility of this technique for REE detection post-extraction into organic solvents.…”

Nanometer-sized titanium dioxide micro-column on-line preconcentration of La, Y, Yb, Eu, Dy and their determination by inductively coupled plasma atomic emission spectrometry

“…The most widely used techniques for the separation and preconcentration of trace REEs include coprecipitation, 7 liquid-liquid extraction, 8 solid-phase extraction, [9][10][11][12][13][14][15][16] ionexchange 17 and HPLC. 18,19 Recently, the solid-phase extraction (SPE) technique has become increasingly popular compared with the more traditional liquid-liquid extraction methods.…”

Determination of Trace Level Lanthanides and Thorium by Inductively Coupled Plasma Atomic Emission Spectrometry in Different Types of Geological, Red Mud, and Coal Fly Ash Samples After Separation as Oxalates Using Calcium as Carrier

“…The other separation procedures used for lanthanides are solvent extraction (22)(23)(24), fluoride precipitation (25), adsorption on activated carbon (26), and oxalate precipitation (8,9,25,27,28). Even though fluoride precipitation provides a quantitative separation of the lanthanides and Th from major matrix elements, it is not a preferred method because of its corrosive nature and the handling problems of the hydrofluoric acid solution.…”