Valence properties of tellurium in different chemical systems and its determination in refractory environmental samples using hydride generation – Atomic fluorescence spectroscopy

Chen, Yuwei; AlZahrani, Abdullah A.; Deng, Tianlong; Belzile, Nelson

doi:10.1016/j.aca.2015.11.035

Cited by 30 publications

(26 citation statements)

References 26 publications

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“…On the other hand, in mixed acidic systems (HNO 3 , HF with HCl), HCl seemingly does no harm, even on protracted heating. No losses were observed following digestions with HNO 3 -HF-HClO 4 mixtures (Chen et al 2016), an observation made earlier by Nicolas (1976) and Nazarenko and Ermakov (1972). Similarly, in the older literature, evaporation to dryness with concentrated HNO 3 is often used for the preparation of standards or sample digestions (Watterson and Neuerburg 1975), apparently without loss.…”

Section: Digestion Of Solid Matricessupporting

confidence: 77%

“…working at sub-boiling temperatures) are issued in classical analytical texts (Cooper 1971). A recent study by Chen et al (2016) concludes that, on the one hand, losses become inevitable in 3.0 mol L À1 HCl, and that these losses increase with temperature. Similarly, sample treatments with HF lead to losses (Nicolas 1976), which might be due to the formation of gaseous TeF 6 .…”

Section: Digestion Of Solid Matricesmentioning

confidence: 99%

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Tellurium in the environment: current knowledge and identification of gaps

Filella¹,

Reimann²,

Biver³

et al. 2019

Environ. Chem.

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Environmental contextTellurium, a chemical element increasingly being used in new technologies, is an emerging contaminant. Our understanding of tellurium’s environmental behaviour, however, is poor, with critical knowledge gaps such as its distribution in the various environmental compartments and the environmental fluxes associated with mining, usage and disposal. Significant progress in these areas requires the development of robust analytical methods that are sufficiently sensitive to provide data at environmentally relevant concentrations. AbstractTellurium has recently become a ‘technology-critical element’ increasingly used in new applications. Thus, potential environmental impacts need to be evaluated. This, in turn, requires knowledge of its typical concentrations in the environment along with better understanding of the chemical processes governing its environmental behaviour. We evaluate the current situation of our understanding of tellurium in the environment and identify the areas where improvements in measurement technology are most needed. The comprehensive evaluation of published data described in this study shows that values for tellurium concentrations in the different environmental compartments are scarce, particularly in the case of natural waters where reliable estimates of tellurium concentrations in seawater and freshwater cannot even be produced. Data in air are even less abundant than for natural water. Concentration data do exist for soils suggesting a predominant geological origin. Some urban soil surveys and lake sediment data close to tellurium contamination sources point to possible effects on the element’s distribution as a result of human activity; long-range atmospheric transport remains to be proved. Current knowledge about tellurium behaviour in the environment is strongly hindered by analytical difficulties, with insufficiently low analytical detection limits being the main limitation. For instance, ‘dissolved’ concentrations are well below current analytical capabilities in natural water and often require pre-concentration procedures that, for the moment, do not provide consistent results; solid samples require complex mineralisation procedures that often exclude tellurium from routine multielement studies. In general, the use of available measuring techniques is far from straightforward and needs particular expertise. Overcoming the current analytical limitations is essential to be able to progress in the field.

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Section: Digestion Of Solid Matricessupporting

confidence: 77%

Section: Digestion Of Solid Matricesmentioning

confidence: 99%

Tellurium in the environment: current knowledge and identification of gaps

Filella¹,

Reimann²,

Biver³

et al. 2019

Environ. Chem.

View full text Add to dashboard Cite

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“…Moreover, where certified values by aqua regia and another techniques (4-acid digestion) are available, as is the case for OREAS 603, 600 and 522, the aqua regia values are higher in one case (OREAS 603) and lower in the other two, with the difference not always being significant. Several authors claim that HCl never leads to Te losses when combined with some other acid (Chen et al 2016 and references cited therein). Yet, our results show that there is considerable variation between samples, with the added difficulty that aqua regia digestions can give divergent results depending on the precise protocol chosen, particularly at low concentrations, a point well illustrated by the samples OREAS 522, 135 and 903.…”

Section: Extraction Efficiencies Of the Individual Digestion Proceduresmentioning

confidence: 99%

A general strategy for the voltammetric trace determination of tellurium in geochemical and environmental matrices after arsenic coprecipitation and critical assessment of digestion schemes

Biver

Filella

2020

Environ. Chem.

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Environmental contextAmong chemical elements classified as elements of strategic importance, tellurium is rapidly becoming an emergent contaminant. There is, however, no accurate and sensitive method for measuring tellurium concentrations in environmental and geological samples (e.g., soils, sediments), and thus it is not possible to determine whether an ecosystem is being polluted by human activities. This study provides a reliable answer to this problem. AbstractA general method is proposed for the determination of tellurium in environmental and geochemical samples. Samples may be digested by any technique (acid or fusion digestion). The tellurium in the resulting solution is reductively coprecipitated with added arsenite by hypophosphorous acid, and the precipitate is redissolved and analysed by catalytic anodic stripping voltammetry. Several sample digestion techniques (acid and fusion digestions) are critically assessed. The method is applied to ore certified reference materials, with tellurium concentrations spanning three orders of magnitude, and sediment certified reference materials (ocean, lake and estuarine). An overall limit of detection (LOD) of 5 ppb is achieved. Acid digestion by H2SO4 and by HClO4 or sintering with Na2O2 in glassy carbon crucibles are shown to be the most adequate sample digestion techniques.

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“…minerals, rocks) with tellurium content 0.0-100 mg g -1 , [24], coal, [25], in lead and lead alloys [26], in the environment (water, plants, biological materials) [27][28][29]. Such techniques as atomic emission spectrometry (AES) with inductively coupled (ICP) or microwave (MP) plasma, in conjunction with mass spectrometry, [30][31][32][33], atomic fluorescence spectrometry, [34][35][36], the optical emission spectrometry [37] are used for the tellurium and tellurium trace analysis in various objects. In most of these works, tellurium is converted to the hydride before the spectrometric measurements to increase the sensitivity of the method.…”

Section: Procedures For the Decomposition Of Tellurium-containing Orgmentioning

confidence: 99%

Determination of Tellurium in Tellurium-Containing Organic Compounds by Microwave Plasma-Atomic Emission Spectrometry

Av¹,

Vp²,

Ma³

et al. 2017

Mod Chem Appl

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AbstractА method for determining tellurium in tellurium-containing organic compounds (TOC) by a microwave plasmaatomic emission spectrometer Agilent 4100 has been suggested. One of the sample decomposition methods -the oxygen flask combustion or the acid decomposition in a heating block-can be applied. Telluradiazole derivatives and some other TOC with 20 to 58% tellurium content have been analyzed. Elements such as nitrogen, sulfur, potassium, selenium present in the TOC do not prevent from determining tellurium. The relative error of the analysis is 1-5%.

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Valence properties of tellurium in different chemical systems and its determination in refractory environmental samples using hydride generation – Atomic fluorescence spectroscopy

Cited by 30 publications

References 26 publications

Tellurium in the environment: current knowledge and identification of gaps

Tellurium in the environment: current knowledge and identification of gaps

A general strategy for the voltammetric trace determination of tellurium in geochemical and environmental matrices after arsenic coprecipitation and critical assessment of digestion schemes

Determination of Tellurium in Tellurium-Containing Organic Compounds by Microwave Plasma-Atomic Emission Spectrometry

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