Speciation and Fractionation of Less-Studied
Technology-Critical Elements (Nb, Ta, Ga, In, Ge,
Tl, Te): A Review

Jabłońska‐Czapla, Magdalena; Grygoyć, Katarzyna

doi:10.15244/pjoes/127281

Cited by 19 publications

(8 citation statements)

References 63 publications

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“…Information on environmental concentrations of Te is scarce and often misleading due to inadequate analytical methods. Recent known values in surface water indicate concentrations of a few to low tens of ng/kg [ 4 , 5 ]. There are unknown data about elemental Te concentrations in crust [ 5 ], and values for soil concentrations differ with a broad range from 0.008 mg/kg to 0.03 mg/kg [ 5 ], and in some localities that are naturally anthropologically enriched with Te, compounds can reach from 0.166 mg/kg [ 6 ] even up to 0.5 mg/kg [ 7 ].…”

Section: Tellurium and Its Occurrencementioning

confidence: 99%

Tellurium: A Rare Element with Influence on Prokaryotic and Eukaryotic Biological Systems

Vávrová

Struhárňanská

Turña

et al. 2021

IJMS

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Metalloid tellurium is characterized as a chemical element belonging to the chalcogen group without known biological function. However, its compounds, especially the oxyanions, exert numerous negative effects on both prokaryotic and eukaryotic organisms. Recent evidence suggests that increasing environmental pollution with tellurium has a causal link to autoimmune, neurodegenerative and oncological diseases. In this review, we provide an overview about the current knowledge on the mechanisms of tellurium compounds’ toxicity in bacteria and humans and we summarise the various ways organisms cope and detoxify these compounds. Over the last decades, several gene clusters conferring resistance to tellurium compounds have been identified in a variety of bacterial species and strains. These genetic determinants exhibit great genetic and functional diversity. Besides the existence of specific resistance mechanisms, tellurium and its toxic compounds interact with molecular systems, mediating general detoxification and mitigation of oxidative stress. We also discuss the similarity of tellurium and selenium biochemistry and the impact of their compounds on humans.

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Section: Tellurium and Its Occurrencementioning

confidence: 99%

Tellurium: A Rare Element with Influence on Prokaryotic and Eukaryotic Biological Systems

Vávrová

Struhárňanská

Turña

et al. 2021

IJMS

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“…Due to modernization, there is a high demand of niobium and tantalum globally in superalloy materials applied in superconductors, energy, electronics, cell phones, and energy-related fields. − These two elements along with tellurium, indium, silver, dysprosium, neodymium, and molybdenum are declared as critical metals by the European Union (EU) due to their potential strategic and sustainable energy applications including nuclear, solar, wind, carbon capture and storage. , Due to high melting point and other metallurgical properties, Nb is being used in steel to improve the latter’s mechanical strength, corrosion resistance, reduction in grain boundary, and brittleness. , The high-strength low alloy steel is largely applied in the manufacturing of vehicle bodies, railway tracks, ship hulls, and oil and gas pipelines. Due to the nontoxicity and physiological inertness, Nb and its compounds exhibit large biomedical applications related to medical implantations, pacemakers, etc. − Nb-Ta-based alloy materials have largely been utilized in the manufacturing of superconducting and magnetic materials. , The biocompatibility of the Ta-based compounds have also been explored for the production of surgical clips, metal plates, screw, and support for bone growth and joining. , …”

Section: Introductionmentioning

confidence: 99%

Evaluation of a Phosphinate Functionalized Ionic Liquid for the Separation of Nb and Ta from Nitric Acid Feed Conditions

Goyal,

Sengupta,

Mohapatra

2023

ACS Omega

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A 'green' single-step separation process, involving a phosphonium phosphinate functionalized ionic liquid (FIL) in C 8 mim•NTf 2 , has been developed for highly encouraging improvements in the mutual separation of Nb and Ta with a maximum separation factor of ∼48 at 2 M nitric acid. The separation factor in C 4 mim•NTf 2 was found to be somewhat lower compared to that seen in C 8 mim•NTf 2 . In C 8 mim•NTf 2 , the extraction proceeded via the neutral NbOF 3 (R 4 P + )(R 2 POO − ) and TaOF 3 (R 4 P + )(R 2 POO − ) species predominated by a 'solvation' mechanism at 2 M HNO 3 , where both the cationic and anionic parts of the FIL took part in the metal ion extraction. However, in the case of C 4 mim•NTf 2 , the extraction proceeded via a cation exchange mechanism involving the mono-positive species viz.Only the phosphinate group of the FIL was directly involved in the binding to the metal ion. The charge neutrality was maintained by the exchange of the C 4 mim + ion from the ionic liquid phase to the aqueous phase. The processes were spontaneous, exothermic involving outer sphere complexation. The radiolytic stabilities of the C 8 mim•NTf 2 -based solvent systems were poorer than those of the solvents based on C 4 mim•NTf 2 . Aqueous solutions of EDTA-guanidine carbonate or DTPA-guanidine carbonate showed promising back extraction ability though three contacts of these organic phases were required for more than 99.99% stripping of the metal ion. The reusability of these solvent systems was evaluated. After four consecutive cycles, a maximum of only 8% reduction in the extraction efficiency of Ta was noticed, while for Nb it was less than 4% for Nb.

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“…Thanks to this, it is possible to combine analytical techniques in tellurium speciation studies using ICP-MS, with excellent sensitivity and ultratrace amounts of tellurium detection [ 29 , 30 , 31 , 32 , 33 ], for example 0.56 ng/L when analyzing Te(IV) in water [ 27 ]. There are very few publications on the speciation of tellurium in soils [ 8 ], and in the available literature, many authors have only studied the total content of tellurium in soils, or only one of the species [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Development of a Tellurium Speciation Study Using IC-ICP-MS on Soil Samples Taken from an Area Associated with the Storage, Processing, and Recovery of Electrowaste

Jabłońska‐Czapla

Grygoyć

2021

Molecules

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The optimization and validation of a methodology for determining and extracting inorganic ionic Te(VI) and Te(IV) forms in easily-leached fractions of soil by Ion Chromatography-Inductively Coupled Plasma-Mass Spectrometry (IC-ICP-MS) were studied. In this paper, the total concentration of Te, pH, and red-ox potential were determined. Ions were successfully separated in 4 min on a Hamilton PRPX100 column with 0.002 mg/kg and 0.004 mg/kg limits of detection for Te(VI) and Te(IV), respectively. Soil samples were collected from areas subjected to the influence of an electrowaste processing and sorting plant. Sequential chemical extraction of soils showed that tellurium was bound mainly with sulphides, organic matter, and silicates. Optimization of soil extraction allowed 20% average extraction efficiency to be obtained, using 100 mM citric acid as the extractant. In the tested soil samples, both tellurium species were present. In most cases, the soils contained a reduced Te form, or the concentrations of both species were similar.

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Speciation and Fractionation of Less-Studied Technology-Critical Elements (Nb, Ta, Ga, In, Ge, Tl, Te): A Review

Cited by 19 publications

References 63 publications

Tellurium: A Rare Element with Influence on Prokaryotic and Eukaryotic Biological Systems

Tellurium: A Rare Element with Influence on Prokaryotic and Eukaryotic Biological Systems

Evaluation of a Phosphinate Functionalized Ionic Liquid for the Separation of Nb and Ta from Nitric Acid Feed Conditions

Development of a Tellurium Speciation Study Using IC-ICP-MS on Soil Samples Taken from an Area Associated with the Storage, Processing, and Recovery of Electrowaste

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