Speciation of some heavy metals in coal fly ash

Chaudhary, Sudesh; Banerjee, Dipanwita

doi:10.3184/095422907x236100

Cited by 26 publications

(12 citation statements)

References 17 publications

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“…The levels of Nickel ranged from 18.85 to 73.70% with an average of 51.58%. This predominance of inactive forms of nickel is in agreement with other studies of contaminated soils (Gupta and Chen 1975;Tessier and Campbell, 1980;Ma and Rao, 1997;Abeh et al, 2007;Chaudhary and Banerjee, 2007;Osakwe, 2010). Norrish, (1975 observed that nickel is commonly occluded by silicate during soil weathering.…”

Section: Okolie Lucky Precioussupporting

confidence: 92%

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Distribution of different fractions of Iron, Zinc, Chromium, lead and Nickel in Soils around Petrol filling stations in selected Areas of Delta State, Nigeria

Osakwe¹,

Okolie²

2016

Journal of Applied Sciences and Environmental Management

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ABSTRACT:The geochemical forms of some heavy metals in soils around selected petrol filling stations were studied in order to assess the mobility and bioavailability of the metals and hence their potential environmental risk. Water soluble fraction (F 1 ) contained an average of 0.97% iron, 1.40% zinc, 2.37% chromium, 2.08% lead and 41.96% nickel with the abundance trend of Ni > Cr > Pb > Zn > Fe. Metal bound to exchangeable phase followed the same abundance trend with an average of 6.46% nickel, 5.48% chromium, 2.64% lead, 2.55% zinc and 0.62% iron. Lead was predominantly associated with carbonate fraction with an average of 52.32% followed by iron with an average of 15.41%. Other metal average levels in the carbonate fractions were 9.66% for nickel, 8.78% for chromium, and 8.73% for zinc giving the abundance trend of Pb > Fe > Ni > Cr > Zn. The most important metal in iron-manganese oxide phase was zinc with an average of 42.49%, followed by iron with an average of 32.82%. The averages of the other metals bound to this phase were 30.39%, 13.24% and 6.46% for chromium, lead and nickel respectively. The organic bound metals were in the abundance trend of Fe > Zn > Cr > Pb > Ni with average of 39.48% for iron, 30.87% for zinc, 23.03% for chromium, 8.54% for lead and 4.94% for nickel. Nickel with an average of 51.58% was predominantly associated with the residual fraction. The other metals bound to this phase in order of their importance to the fraction had the average of 22.75% for chromium, 13.96% for zinc, 12.24% for lead and 10.97% for iron. The mobility factor values of the metals were moderately high with the abundance trend of Pb > Ni > Cr > Fe > Zn. The generally low levels of the metals in the residual fraction coupled with the mobility factor trend suggest potential risk for the metals. ©JASEM

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Section: Okolie Lucky Precioussupporting

confidence: 92%

“…Lead ranged from 9.72 to 14.265% with an average of 12.24%. Many studies reported predominance of lead in this fraction (Chaudhary and Banerjee, 2007;Asagba et al, 2007;Osakwe and Egharevba, 2008;Osakwe et al, 2012). The levels of Nickel ranged from 18.85 to 73.70% with an average of 51.58%.…”

Section: Okolie Lucky Preciousmentioning

confidence: 96%

Distribution of different fractions of Iron, Zinc, Chromium, lead and Nickel in Soils around Petrol filling stations in selected Areas of Delta State, Nigeria

Osakwe¹,

Okolie²

2016

Journal of Applied Sciences and Environmental Management

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“…Although the major constituents of fly ash are similar to those of natural soils and rocks, fly ash tends to be enriched in many trace metals (Guthrie et al, 1982;Eary et al, 1990;Mattigold et al, 1990;Gieré et al, 2003;Chaudhary and Banerjee, 2007). Furthermore, the pH dependent leaching of metal ions (e.g., arsenic, cadmium, chromium, zinc, lead, mercury, selenium) (Baba et al, 2008) raises concern regarding potential for toxic effects if contacted by aquatic receptors (Roy et al, 1981;Carlson and Adriano, 1993;Rowe et al, 2002;Kuzmick et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Geochemical investigations of metals release from submerged coal fly ash using extended elutriate tests

Bednar¹,

Chappell²,

Seiter³

et al. 2010

Chemosphere

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a b s t r a c tA storage pond dike failure occurred at the Tennessee Valley Authority Kingston Fossil Plant that resulted in the release of over 3.8 million cubic meters (5 million cubic yards) of fly ash. Approximately half of this material deposited in the main channel of the Emory River, 3.5 km upstream of the confluence of the Emory and Clinch Rivers, Tennessee, USA. Remediation efforts to date have focused on targeted removal of material from the channel through hydraulic dredging, as well as mechanical excavation in some areas. The agitation of the submerged fly ash during hydraulic dredging introduces river water into the fly ash material, which could alter the redox state of metals present in the fly ash and thereby change their sorption and mobility properties. A series of extended elutriate tests were used to determine the concentration and speciation of metals released from fly ash. Results indicated that arsenic and selenium species released from the fly ash materials during elutriate preparation were redox stable over the course of 10 d, with dissolved arsenic being present as arsenate, and dissolved selenium being present as selenite. Concentrations of certain metals, such as arsenic, selenium, vanadium, and barium, increased in the elutriate waters over the 10 d study, whereas manganese concentrations decreased, likely due to oxidation and precipitation reactions.Published by Elsevier Ltd.

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“…Further, the recovery of silicate from the silicate material is done by acidic treatment. However, fly ash has several acid-soluble elements such as Na, K, P, Mg, Ca, and Fe [18,179], which can be present in the obtained silicate in a minute quantity [20].…”

Section: Silica Extraction From Fly Ash By Chemical Methodsmentioning

confidence: 99%

Advances in Methods for Recovery of Ferrous, Alumina, and Silica Nanoparticles from Fly Ash Waste

Yadav

Fulekar

2020

Ceramics

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Fly ash or coal fly ash causes major global pollution in the form of solid waste and is classified as a “hazardous waste”, which is a by-product of thermal power plants produced during electricity production. Si, Al, Fe Ca, and Mg alone form more than 85% of the chemical compounds and glasses of most fly ashes. Fly ash has a chemical composition of 70–90%, as well as glasses of ferrous, alumina, silica, and CaO. Therefore, fly ash could act as a reliable and alternative source for ferrous, alumina, and silica. The ferrous fractions can be recovered by a simple magnetic separation method, while alumina and silica can be extracted by chemical or biological approaches. Alumina extraction is possible using both alkali- and acid-based methods, while silica is extracted by strong alkali, such as NaOH. Chemical extraction has a higher yield than the biological approaches, but the bio-based approaches are more environmentally friendly. Fly ash can also be used for the synthesis of zeolites by NaOH treatment of variable types, as fly ash is rich in alumino-silicates. The present review work deals with the recent advances in the field of the recovery and synthesis of ferrous, alumina, and silica micro and nanoparticles from fly ash.

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Speciation of some heavy metals in coal fly ash

Cited by 26 publications

References 17 publications

Distribution of different fractions of Iron, Zinc, Chromium, lead and Nickel in Soils around Petrol filling stations in selected Areas of Delta State, Nigeria

Distribution of different fractions of Iron, Zinc, Chromium, lead and Nickel in Soils around Petrol filling stations in selected Areas of Delta State, Nigeria

Geochemical investigations of metals release from submerged coal fly ash using extended elutriate tests

Advances in Methods for Recovery of Ferrous, Alumina, and Silica Nanoparticles from Fly Ash Waste

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