Determination of rare-earth elements in environmental samples

Smakhtin, L. A.; Mekhryusheva, L.I.; Filippova, N. V.; Miglina, N. V.; Sinitsyna, T.S.

doi:10.1007/bf02165052

Cited by 11 publications

(3 citation statements)

References 14 publications

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“…Most REEs are obtained by hydrometallurgical methods. Moreover, the REEs in environmental samples also need to be determined precisely because they are important indicative elements for geochemical and geological research to solve the problems of genesis of ore deposits [91]. Hence, separation and purification of REEs from aqueous solutions is an important issue.…”

Section: Rare Earth Elementsmentioning

confidence: 99%

Recovery and Separation of Metal Ions from Aqueous Solutions by Solvent‐Impregnated Resins

et al. 2016

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The recovery and separation of metals from aqueous solutions is one of the research hotspots in hydrometallurgy, environment protection, analytical chemistry, etc. Much attention has been paid to solvent-impregnated resins (SIRs) since these were firstly proposed for the extraction of metals. SIRs are characterized by high efficiency and selectivity, convenient preparation, and easy operation because they combine the unique advantages of solvent extraction and ion exchange. The preparation and features of SIRs are summarized and their applications in the extraction of various metals from solutions are reviewed. In addition, the equilibrium, thermodynamics, and sorption kinetics of the metals onto SIRs are elucidated in detail.

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Section: Rare Earth Elementsmentioning

confidence: 99%

Recovery and Separation of Metal Ions from Aqueous Solutions by Solvent‐Impregnated Resins

et al. 2016

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“…It was added in the manufacturing of steel to improve its properties like ductility and malleability [2] . High purity La is used as catalyst in nuclear and in automobile industries [3]. An excessive amount of La in soil acted as pollutants .It can cause biological concentration , environmental enrichment, and accumulation in the liver [4].…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Determination of Lanthanum (III) With Bromopyrogallol Red And Cetylpridinium Chloride -Applications in Natural Waters and Urine

Saber¹,

Mohammed²

2022

Journal of Pharmaceutical Negative Results

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A highly sensitive spectrophotometric procedure for the estimation of lanthanum in aqueous medium has been established. The method was involved the reaction of lanthanum with bromopyrogallol as chelating agent in the presence of cetylpyridinium chloride at pH4.61 to produce a soluble blue colour ternary complex exhibited maximum absorption at 661nm. The method adheres to Beer's low over the concentration range 0.125 –5.0 μg/ml with coefficient determination (r2= 0.9987). The molar absorptivity(ℇ) of the ternary complex (La(III)-BPR-CPC) is 5.39x104 M-1cm-1 which corresponds to Sandell's sensitivity index of 0.00258 μg.cm-2. The stoichiometric composition of the ternary complex was estimated and found to be (1:2:4) (La:BPR:CPC), respectively. The values of detection limit (DL) and quantitation limit (QL) were calculated and found to be 0.0630 and 0.0817 μg.ml-1, respectively. A recovery% was found in the range 95.3% to 103.5%, while the precision (RSD) was estimated in the range 0.126 to 1.705. The proposed procedure has been applied successfully for the determination of lanthanum in natural waters and urine sample.

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“…The analysis of environmental samples, like monazite sand, for rare earth elements is an important topic for geochemical and geological research, which allows solving the problems of genesis of ore deposits. 19 Cerium is the major element present in monazite sands associated with lanthanum, thorium and uranium. Generally monazite sand is treated with an alkali followed by acid digestion and extraction with tetra butyl phosphate for the separation of lanthanides.…”

Section: Introductionmentioning

confidence: 99%

Octafunctionalized calix[4]resorcinarene-N-fenil-acetohydroxamic acid for the separation, preconcentration and transport studies of cerium(IV)

Jain¹,

Pillai²,

Kanaiya³

2006

J. Braz. Chem. Soc.

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Um novo método para extração líquido-líquido, separação e pré-concentração de cério(IV) com um derivado ácido do calix [4]resorcinareno [C4RAHA] é descrito. Cério foi extraído em pH 9 com etilacetato, e recuperado de areias monazíticas, na presença de tório, urânio, lantânio e um grande número de cátions e ânions. Cério(IV) forma um complexo colorido, amarelo, λ max 381 nm, absortividade molar de 1,06 × 10 4 L mol -1 cm -1 e obedece a lei de Beer no intervalo entre 0,4 e 15 mg mL -1 . A razão metal-ligante encontrada para cério(IV) foi de 4:1 (M:L). Estudos de transporte foram realizados em um sistema de três fases, através de uma membrana líquida contendo C4RAHA. Para medidas por ICP OES, o extrato pode ser diretamente aspirado, o que aperfeiçoa a sensibilidade em 25 vezes e os limites de estimativa são 5-150 μg L -1 de cério. O método foi aplicado para a determinação de cério em materiais geológicos de referência, areia monazítica e amostras de água de mar.A new method for liquid-liquid extraction, separation and preconcentration of cerium(IV) with a calix[4]resorcinarene acid derivative [C4RAHA] is reported. Cerium was extracted at pH 9 in ethyl acetate and recovered from monazite sands in the presence of thorium, uranium, lanthanum and large number of cations and anions. Cerium(IV) forms yellow coloured complex, λ max 381 nm, molar absorptivity 1.06 × 10 4 L mol -1 cm -1 and obeys Beer's law over the range 0.4-15 mg mL -1 . The metal ligand ratio for cerium (IV) was found to be 4:1 (M:L). Transport studies were carried out in a three phase system across a liquid membrane containing C4RAHA. For ICP OES measurements, the extract can be directly aspirated, which enhances the sensitivity 25-fold and the limits for estimation are 5-150 μg L -1 of cerium. The method was applied for the determination of cerium in standard geological samples, monazite sand and sea water samples.Keywords: cerium(IV), calix [4]resorcinarene-N-fenil-acetohydroxamic acid(C4RAHA), transport studies, spectrophotometry IntroductionThe chemistry of bowl shaped macrocyclic compounds that can complex organic and inorganic guests has been receiving significant attention in the field of supramolecular chemistry. 1 Among the different macrocyclic compounds, calix[4]resorcinarenes and calixarenes 2 have been widely employed as changeable units with a well defined structure and easy accessibility. The calixresorcinarenes are unique three-dimensional cyclic tetramer and hexamer that belong to a class of metacyclophanes in which resorcinol units are linked by methylene bridges. 3 The interest towards this class of compounds which are capable of forming host guest complexes is stimulated by the development of supramolecular chemistry which uses them for the possible creation of synthetic receptors and carriers of cations, anions and neutral molecules. 4 The host properties of calix[4]resorcinarenes continue to draw research interests due to its potential application as macrocyclic receptors, 5 as dendrimers in biological systems, 6 nano-capsule, 7 na...

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Determination of rare-earth elements in environmental samples

Cited by 11 publications

References 14 publications

Recovery and Separation of Metal Ions from Aqueous Solutions by Solvent‐Impregnated Resins

Recovery and Separation of Metal Ions from Aqueous Solutions by Solvent‐Impregnated Resins

Spectrophotometric Determination of Lanthanum (III) With Bromopyrogallol Red And Cetylpridinium Chloride -Applications in Natural Waters and Urine

Octafunctionalized calix[4]resorcinarene-N-fenil-acetohydroxamic acid for the separation, preconcentration and transport studies of cerium(IV)

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