Chemical Speciation of Vanadium in Coal Bottom Ash

Aydın, Fırat; Saydut, Abdurrahman; Gündüz, Beniz; Aydın, Işıl; Hamamcı, Candan

doi:10.1002/clen.201100195

Cited by 20 publications

(15 citation statements)

References 32 publications

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“…In coal bottom ash, total vanadium concentrations can go up to 0.7 g per kg of dry weight. 2 The occurrence of ''fossil'' vanadium poses potential environmental and health problems, in as far as burning coal and oil produces vanadium oxides that become absorbed to dust particles. As detailed below, vanadium oxides can cause health hazards; furthermore, vanadium oxides are powerful catalysts in the oxidation of, for example, SO 2 to SO 3 (and hence sulfuric acid).…”

Section: General and Backgroundmentioning

confidence: 99%

The role of vanadium in biology

2015

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Vanadium is special in at least two respects: on the one hand, the tetrahedral anion vanadate(v) is similar to the phosphate anion; vanadate can thus interact with various physiological substrates that are otherwise functionalized by phosphate. On the other hand, the transition metal vanadium can easily expand its sphere beyond tetrahedral coordination, and switch between the oxidation states +v, +iv and +iii in a physiological environment. The similarity between vanadate and phosphate may account for the antidiabetic potential of vanadium compounds with carrier ligands such as maltolate and picolinate, and also for vanadium's mediation in cardiovascular and neuronal defects. Other potential medicinal applications of more complex vanadium coordination compounds, for example in the treatment of parasitic tropical diseases, may also be rooted in the specific properties of the ligand sphere. The ease of the change in the oxidation state of vanadium is employed by prokarya (bacteria and cyanobacteria) as well as by eukarya (algae and fungi) in respiratory and enzymatic functions. Macroalgae (seaweeds), fungi, lichens and Streptomyces bacteria have available haloperoxidases, and hence enzymes that enable the 2-electron oxidation of halide X(-) with peroxide, catalyzed by a Lewis-acidic V(V) center. The X(+) species thus formed can be employed to oxidatively halogenate organic substrates, a fact with implications also for the chemical processes in the atmosphere. Vanadium-dependent nitrogenases in bacteria (Azotobacter) and cyanobacteria (Anabaena) convert N2 + H(+) to NH4(+) + H2, but are also receptive for alternative substrates such as CO and C2H2. Among the enigmas to be solved with respect to the utilization of vanadium in nature is the accumulation of V(III) by some sea squirts and fan worms, as well as the purport of the nonoxido V(IV) compound amavadin in the fly agaric.

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Section: General and Backgroundmentioning

confidence: 99%

The role of vanadium in biology

2015

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“…The methodology for fractionation is lacking since only total nickel in the bottom ash is determined. However, a variety of nickel chemical forms should be considered, some being complete carcinogens whereas others lack carcinogenic activity (Aydin et al, 2011;2012). Although the total concentration of trace elements is still useful in many areas, the knowledge of speciation is of primary importance because the toxicity, mobility, bioavailability, and bioaccumulation depend on the chemical species.…”

Section: Resultsmentioning

confidence: 99%

“…The extracts were centrifuged and the supernatants were filtered through a 0.45-μm GF/C filter membrane (Aydin et al, 2011;Gunduz et al, 2011;Aydin et al, 2012). The soluble Ni in each sample was determined.…”

Section: Digestion Procedures and Measurementmentioning

confidence: 99%

Chemical fractionation of nickel in asphaltite based bottom ash

Aydın

Kılınç

et al. 2013

Chemical Speciation & Bioavailability

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Asphaltite, originating from petroleum, contains many kinds of mineral elements derived from its generation. These elements exist in different forms which may change throughout the asphaltite combustion process. Chemical fractionation of nickel (Ni) is necessary for risk assessment of asphaltite based bottom ash (ABBA). This study presents the concentration and fractionation of Ni in bottom ash of asphaltite (Sirnak, SE Anatolia, Turkey). Determination of total Ni in ash was performed in two stage microwave-acid digestion followed by inductively coupled plasma optical emission spectrometry (ICP-OES). Dry ashing is used for the almost complete elimination of organic materials prior to analyte determination. A seven-step sequential extraction process to fractionation of Ni from ABBA was investigated. Total Ni concentration in the ABBA was found to be 568.15 mg kg -1 .

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“…To date, Community Bureau of Reference (BCR) is the most popular SE schemes (Ure et al, 1993;Tessier et al, 1979). Some other SE schemes are also available with various combinations of extraction steps and sequences (Wang et al, 1999;Wenzel et al, 2001;Rao et al, 2008;Chang et al, 2009;Huang and Kretzschmar, 2010;Teng et al, 2011a;Aydin et al, 2012;Shaheen and Rinklebe, 2014). Since the first SE scheme was developed in late 1970s, there are already numerous SE schemes being proposed (Bacon and Davidson, 2008;Rao et al, 2008;Hass and Fine, 2010;Zimmerman and Weindorf, 2010;Okoro et al, 2012;Shaheen and Rinklebe, 2014), which first focusing on cadmium, chromium, copper, iron, lead, manganese, nickel and zinc, and thereafter on arsenic, mercury, selenium and radionuclides (Bacon and Davidson, 2008;Pueyo et al, 2008;Hass and Fine, 2010;Okoro et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

An optimised sequential extraction scheme for the evaluation of vanadium mobility in soils

Huang

Brandl

2017

Journal of Environmental Sciences

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Reviewing the current state of knowledge about sequential extraction applied for soil vanadium (V) fractionation, we identified an urgent requirement of an sequential extraction (SE) specified for V. Namely, almost all previous SE extracted only 8.4%-48% of total V in soils (excluding residue). Thus, we proposed an eight-step SE for V fractionation in soils according to the knowledge gained from literature and our own dissolution experiments with model minerals. After extracting the mobilisable and adsorbed V with de-ionised water and 5mmol/L phosphate, 1mol/L pyrophosphate was applied to gather organic matter bound V which minimised the artefact dissolving Al and Fe (hydr)oxides occurred when using HNO-HO for extraction. Extraction with 0.4mol/L NHOH⋅HCl was highly selective toward manganese oxides. Fractionation of different crystalline Al and Fe (hydr)oxides associated V with 1mol/L HCl, 0.2mol/L oxalate buffer and 4mol/L HCl at 95°C especially improved the extractability of V incorporated with crystalline phase associated V. The suitability of our new SE scheme was confirmed by its higher selectivity against the target phases and higher extraction efficiencies (55%-77% of total V) with model minerals and 6 soils of different properties than previous SE.

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Chemical Speciation of Vanadium in Coal Bottom Ash

Cited by 20 publications

References 32 publications

The role of vanadium in biology

The role of vanadium in biology

Chemical fractionation of nickel in asphaltite based bottom ash

An optimised sequential extraction scheme for the evaluation of vanadium mobility in soils

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