Modes of Occurrence of Trace Elements (Na, K, Fe, Si) in Coal Used for COREX Process

2011 ◽  
Vol 391-392 ◽  
pp. 81-85
Author(s):  
Li Hua Zhang ◽  
Jia Xin Fan ◽  
Sheng Li Wu
Keyword(s):  
Trace Elements ◽  
Sequential Extraction ◽  
Iron Oxides ◽  
Manganese Oxides ◽  
Extraction Procedure ◽  
Sequential Extraction Procedure ◽  
Icp Oes ◽  
Digestion Method ◽  
Modes Of Occurrence ◽  
Wet Digestion

In this paper, the modes of occurrence of the trace elements of Na, K, Fe and Si in SX-Coal and SD-Coal, which were used for COREX process, were analyzed. The coal was treated by wet digestion method and then the content of trace elements was analyzed. After that, the modes of occurrence of the elements were studied by sequential extraction procedure method and analyzed by ICP-OES. The results showed that the content of Na element is the highest and the content of K and Si elements is very low among the four elements in both kinds of coal. Na and K elements mainly exist in the mode of residue in SX-Coal and SD-Coal, and they are tends to enriched in the residue during the pyrolysis. Fe and Si elements mainly exist in the mode of carbonate, iron oxides and manganese oxides in SD-Coal. Fe and Si are tends to be decomposed from the compounds during the pyrolysis.

Mobility of important toxic analytes in urban dust and simulated air filters determined by sequential extraction and GFAAS/ICP-OES methods

2007 ◽  
Vol 61 (4) ◽  
Author(s):  
J. Sysalová ◽  
J. Száková
Keyword(s):  
Trace Elements ◽  
Sequential Extraction ◽  
Extraction Procedure ◽  
Urban Dust ◽  
Icp Oes ◽  
Reliability Of Results ◽  
Air Filters ◽  
Factors Influencing ◽  
Triton X ◽  
The Impact

AbstractThe modified BCR three-step sequential extraction procedure has been applied to homogenized urban dust samples and to simulated air filters loaded with the prepared urban dust via the wet deposition procedure. This work has been focused on comparative study of the distribution of trace elements in both samples and evaluation of the factors influencing the reliability of results with respect to the proposed extraction procedure. Extracted chemical fractions were analyzed by ICP-OES and GFAAS depending on the concentration levels of investigated trace elements As, Cd, Cr, Mn, Ni, and Pb, selected according to their adverse effect on the human health. Statistically evaluated results indicate significant differences between the extracted portions of analytes in urban dust and simulated air filters, where the mobility of some analytes in simulated air filters was higher than that in urban dust samples. The impact of surfactant Triton X-100 (0.05 vol. %) on the extraction procedure was also investigated.

scholarly journals Sequential extraction studies on the river Tisa sediments for the assessment of the metal pollution

2020 ◽  
pp. 89-98
Author(s):  
Snezana Strbac ◽  
Milica Kasanin-Grubin ◽  
Gordana Gajica ◽  
Jelena Mutic ◽  
Nebojsa Vasic
Keyword(s):  
High Risk ◽  
Sequential Extraction ◽  
Sampling Site ◽  
River Sediments ◽  
Extraction Procedure ◽  
Sequential Extraction Procedure ◽  
Icp Oes ◽  
Bcr Sequential Extraction ◽  
Anthropogenic Origin ◽  
Medium Risk

The sequential extraction procedure was applied for partitioning of metals in river sediments collected along the course of the river Tisa (Serbia). Eight elements (Sb, Sn, As, Cd, Cu, Hg, Pb and Zn) from twenty-one sampling site were analyzed using the modified BCR sequential extraction procedure in combination with ICP-OES. The results of sequential extraction, statistical analyses and calculation of EF and lithogenic and anthro?pogenic ratio of metals are similar. In the river Tisa sediments Sn, Cd, Hg, Pb and Zn are of anthropogenic origin, while As, Cu and Sb are of lithogenic and anthropogenic origin. The sediments from the river Tisa show high risk for Cd, medium risk for Hg and Zn, low risk for Sn, As, Cu and Pb, whereas Sb does not show the risk for the aquatic environment.

scholarly journals Total and extractable forms of Cu, Zn, Ni, Cr, and Fe in vineyard soil (Valandovo valley, Macedonia) determined by a sequential extraction procedure

2012 ◽  
Vol 31 (2) ◽  
pp. 271 ◽  
Author(s):  
Elizabeta Karakaseva ◽  
Blazo Boev ◽  
Vesna Zajkova
Keyword(s):  
Sequential Extraction ◽  
Manganese Oxides ◽  
Agricultural Soils ◽  
Dominant Role ◽  
Extraction Procedure ◽  
Exchange Capacity ◽  
Sequential Extraction Procedure ◽  
Residual Fraction ◽  
Chemical Conditions ◽  
Almost All

The total and extractable forms of Cu, Zn, Pb, Ni, Cr, and Fe in vineyard soils from Valandovo valley were analyzed in order to understand the existence of metals in soils and their potential availability to the flora and fauna. The metals (Cu, Zn, Ni, Pb, Cr, and Fe) in soil was determined by by ICP-EAS and sequential extraction procedure [5]. Other chemical and physical properties such as pH, CEC (cation exchange capacity), organic matter, carbonate and particle size of soils collected from vineyards plots were also analyzed. The total concentrations of Cu, Zn, Pb, Ni, Cr, and Fe in almost all soil samples does not exceed the maximum permissible concentrations (MPC) of trace elements in agricultural soils proposed by Kabata-Pendias and Pendias (2001). The only exception was the soil sample R (3), where higher concentrations were measured especially for Fe, Ni and Cr, and to a lesser extent Cu and Zn. Sequence extraction shows that the distribution of metals increase in order: oxidisable (e.g., organic substance and sulphides) > fraction bound in the crystal lattice of silicate minerals (residual fraction) > reducible (e.g., iron/manganese oxides) > exchangeable, water and acid soluble (e.g., carbonates). The prevalence of metals in oxidisable fraction in the soil shows that this fraction has a dominant role in controlling the behavior and transport of these metals in soil. The low levels of metals in exchangeable and carbonate bound fraction (Ni (7,5%)>Pb (3,5%)> Cu (2,6%)> Zn (2,2%)> Cr (0,2%)) indicates a low rate of activity and mobility of these metals in soil solution caused by the current physico-chemical conditions in soil.

scholarly journals Sequential extraction procedure to obtain the composition of terrigenous detritus in marine sediments

MethodsX ◽  
2020 ◽  
Vol 7 ◽  
pp. 100888
Author(s):  
Margit H. Simon ◽  
Daniel P. Babin ◽  
Steven L. Goldstein ◽  
Merry Yue Cai ◽  
Tanzhuo Liu ◽  
...  
Keyword(s):  
Sequential Extraction ◽  
Marine Sediments ◽  
Extraction Procedure ◽  
Sequential Extraction Procedure
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