Investigation of the separation of scandium and rare earth elements from red mud by use of reversed-phase HPLC

Analytical and Bioanalytical Chemistry
Lambrini V TsakanikaLeonidas N Mendrinos

Abstract

A chromatographic method has been developed for separation and determination of scandium (Sc) and rare earth elements (REEs) in samples from a red mud (RM)-utilization process. Reversed-phase high-performance liquid chromatography (RP-HPLC) with post-column derivatization using 4-(2-pyridylazo)-resorcinol (PAR) and UV-visible detection at 520 nm was tested using different gradient elution profiles and pH values to optimize separation and recovery, primarily for Sc but also for yttrium and the individual lanthanides, from iron present in the samples. The separation was performed in less than 20 min by use of a mobile phase gradient. The concentration of alpha-hydroxyisobutyric acid ( alpha-HIBA), as eluent, was altered from 0.06 to 0.4 mol L(-1) (pH 3.7) and 0.01 mol L(-1) sodium salt n-octane sulfonic acid (OS) was used as modifier. Very low detection limits in the nanogram range and a good resolution for Sc and REEs except for Y/Dy were achieved. Before application of the method to the red mud samples and to the corresponding bauxites, Sc and REEs were leached from red mud with 0.6 mol L(-1) HNO(3) and mostly separated, as a group, from the main elements by ion exchange/selective elution (6 mol L(-1) HNO(3)) in accordance with...Continue Reading

Citations

Aug 27, 2011·Journal of Hazardous Materials·P E TsakiridisS Agatzini-Leonardou
Nov 3, 2010·Journal of Hazardous Materials·Indrani GhoshA V Ramesh Kumar
Feb 26, 2008·Journal of Hazardous Materials·S Agatzini-LeonardouCh Markopoulos
Feb 14, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Nobuhiro IshidaTsunenori Kameda
Apr 12, 2016·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Magdi E KhalifaMohamed M Elnagar
Dec 12, 2017·The Science of the Total Environment·Ralph M BolanzRalph Steininger
Mar 31, 2009·Analytica Chimica Acta·Surendra P VermaRodolfo Rodríguez-Ríos

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