Simultaneous determination of trace rare-earth elements in simulated water samples using ICP-OES with TODGA extraction/back-extraction

Abstract

The determination of trace rare-earth elements (REEs) can be used for the assessment of environmental pollution, and is of great significance to the study of toxicity and toxicology in animals and plants. N, N, N′, N′-tetraoctyl diglycolamide (TODGA) is an environmental friendly extractant that is highly selective to REEs. In this study, an analytical method was developed for the simultaneous determination of 16 trace REEs in simulated water samples by inductively coupled plasma optical emission spectroscopy (ICP-OES). With this method, TODGA was used as the extractant to perform the liquid-liquid extraction (LLE) sample pretreatment procedure. All 16 REEs were extracted from a 3 M nitric acid medium into an organic phase by a 0.025 M TODGA petroleum ether solution. A 0.03 M ethylenediaminetetraacetic acid disodium salt (EDTA) solution was used for back-extraction to strip the REEs from the organic phase into the aqueous phase. The aqueous phase was concentrated using a vacuum rotary evaporator and the concentration of the 16 REEs was detected by ICP-OES. Under the optimum experimental conditions, the limits of detection (3σ, n = 7) for the REEs ranged from 0.0405 ng mL-1 (Nd) to 0.5038 ng mL-1 (Ho). The relative standard deviations (c = 100 ng mL-1, n = 7) were from 0.5% (Eu) to 4.0% (Tm) with a linear range of 4–1000 ng mL-1 (R2 > 0.999). The recoveries of 16 REEs ranged from 95% to 106%. The LLE-ICP-OES method established in this study has the advantages of simple operation, low detection limits, fast analysis speed and the ability to simultaneously determine 16 REEs, thereby acting as a viable alternative for the simultaneous detection of trace amounts of REEs in water samples.

Synthesis and characterization of magnetic mesoporous Fe3O4@mSiO2–DODGA nanoparticles for adsorption of 16 rare earth elements

“…Some derivatives based on the DGA chemical structure have been synthesized and used industrially for adsorbing REEs and exhibited excellent enrichment and selectivity. 26,27 Unfortunately, no previous work has been published in which magnetic nanoparticles modified with a diglycolamide ligand were used for the adsorption of REEs. There have been reports on the synthesis of magnetic nanomaterials modified with diglycolamide ligands, including diglycolamic acid-functionalized chitosan-coated Fe 3 O 4 (Fe@CS-DGA), 28 TODGA-coated magnetite nanoparticles (Fe 3 O 4 @TODGA), 29 and DGA-methacrylate-coated Fe 3 O 4 particles (Fe 3 O 4 @MC-DGA).…”

Effect of Diglycolamide Ligands Structure on Extraction Performance of Heavy Rare Earth Ions

“…Jinhong Yang et al studied the extraction of Sm and Nd in the hydrochloric acid system with TBDGA (N,N,N',N'-tetraoctyldiglycolamide) [9]. Fukai Li et al [10] used TODGA as an extractant to provide a feasible method for simultaneous determination of trace rare earth elements in water samples. Marino Gergoric et al [11] studied the selectivity of rare earth in its leaching solution by using nitric acid to dissolve NdFeB magnetic waste.…”

Determination of Rare Earth Elements by ICP-MS in some Geological Samples in (Sulaimani) Kurdistan Region of Iraq.

“…Only quite abundant deposits can be called reserve of rare earth, but that amount cannot be reliable practically and economically. Generally ICP-MS technique is the best for determination of trace contents of REEs in the rock sample due to its good sensitivity and selectivity (Li et al, 2017, Longerich et al, 1990. As shown from results the D.L for most REEs by this technique is between (0.01-0.3ppm), the correlation coefficient R-squire ZANCO Journal of Pure and Applied Sciences 2020 (0.999-0.9999) after calibrations, aqueous quality control solutions are analysed at regular intervals throughout the run to achieve best sensitivity for results.…”

“…For determination of REEs in real samples, several analytical methodologies have been applied such as; (INAA) Instrumental Neutron Activation Analysis (Aliyu et al, 2018), (XRF) X-Ray Fluorescence spectrometry (Schramm, 2016, Silva et al, 2020, (ICP-AES) Inductively Coupled Plasma Atomic Emission Spectrometry (Zybinsky et al, 2019), (ICP-OES) Inductively Coupled Plasma Optical Emission Spectrometry (Li et al, 2019), and (ICP-MS) Inductively Coupled Plasma Mass Spectrometry (Druzian et al, 2016, Gorbatenko and Revina, 2015, Zawisza et al, 2011. The most commonly used technique to analyse trace elements in geological samples is an(ICP-MS) a technique that incorporate multielement capability, speed and high sensitivity (Li et al, 2017, Longerich et al, 1990. Even modern analytical technique as (ICP-MS) require pre concentration step, especially for elements like (Lu).…”