Global ETD Search
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Showing 1 to 12 of 12 for “"Sequential Extraction Procedure"”.
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Investigation of the assessment and remediation of land contaminated with heavy metals
… soils were used to assessth e three-stageB CR sequential extraction procedure and recent recommended modifications to this procedure. In general the modifications to the procedure were found to increase levels of copper, lead and iron extracted by the reductant used in the procedure. The …
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Effect of Organic Amendments on Heavy Metal Distribution and Uptake in Vegetable Gardens in Senegal
… metals, carbon content, nutrients, and pH. A sequential extraction procedure was conducted to determine heavy metal sinks. Results showed that sites were sandy in nature, low to medium in organic carbon content (8300 to 36600 mg kg-1), and had pH ranging from 5 to 7.9. The sequential …
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Evaluation of Metal Concentration in Water and Soil in the Southern Region of Lake Nacogdoches
… mobility of the element. A modified Tessier soil sequential extraction procedure was used to determine the speciation of metals in soil samples. Thus, elements in soils are present in various physicochemical forms, which in turn influences its bioavailability. In this study, soil samples were …
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ΜΕΛΕΤΗ ΚΑΤΑΝΟΜΗΣ ΚΑΙ ΕΠΑΝΑΔΙΑΛΥΣΗΣ ΒΑΡΕΩΝ ΜΕΤΑΛΛΩΝ ΣΕ ΝΕΡΑ ΚΑΙ ΙΖΗΜΑΤΑ ΠΟΤΑΜΩΝ ΤΗΣ ΒΟΡΕΙΑΣ ΕΛΛΑΔΑΣ
… AND ALIAKMON IN NORTHERN GREECE. A FIVE STEP SEQUENTIAL EXTRACTION PROCEDURE WAS FOLLOWED IN ORDER TO STUDY THE PARTITIONING OF HEAVY METALS IN CATION-EXCHANGE SITES, CARBONATES FE-MN OXIDES, ORGANIC MATTER-SULPHIDER AND CRYSTAL LATTICE. THE VERTICAL DISTRIBUTION OF HEAVYMETALS IN RIVER …
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Measurement and behaviour of heavy metals in the marine environment of Singapore
… sites was determined using a modified BCR-sequential extraction procedure. In addition, concentrations of heavy metals in the SML and subsurface water, sediments and biota were measured in two mangrove habitats in Singapore located in the West (Sungei Buloh) and East Johore Strait (Sungei …
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Controls on arsenic mobility in contaminated wetland and riverbed streams
… contaminated wetland and riverbed sediments. A sequential extraction procedure was designed and tested to differentiate solid phase arsenic speciation, including adsorbed As and As coprecipitated with amorphous and crystalline oxides and sulfides. The sequential extraction was performed on Wells …
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Evaluation of Leachate Chemistry from Coal Refuse Blended and Layered with Fly Ash
… focus on the oxyanions of As, Cr, Mo, and Se. A sequential extraction procedure revealed a significant portion of the elements in the residual fraction for the refuse/spoil substrates and in metal-oxide bound fractions for the ashes prior to leaching, and a general trend for a greater proportion …
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Microwave-assisted sequential extraction of polyclic aromatic hydrocarbons and potentially toxic elements from urban environmental solids
A method has been developed for the sequential extraction and determination of polycyclic aromatic hydrocarbons (PAHs) and potentially toxic elements (PTEs) from urban substrates using microwave-assisted micellar extraction, the BCR sequential extraction procedure (BCR-SEP) and microwave-assisted …
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An Investigation into Selenium Geochemistry in Phosphate Mine Soils
… for Se speciation and geochemical phases using a sequential extraction procedure (SEP). Additionally, speciation, SEP results, and Se bioavailability in the hyperaccumulator, western aster (Symphyotrichum ascendens (Lindl.)), were related using simple linear regression. Soil speciation and the …
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Total arsenic and arsenic speciation in indigenous food stuffs
… peroxide, trypsin and cellulase enzymatic extraction procedures. The extracted arsenic species were then quantified using HPLC-ICP-MS. A dilute nitric acid (1 % (v/v)) digestion procedure was also used to extract arsenic species from rice and the different parts (root, skin, stem, leaf and …
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Isotopic studies of selenium in environmental samples.
… number of samples which could be processed. A sequential extraction procedure was used to determine the soil fractions with which Se was associated. The four soils and the sewage sludge examined were all found to have less than 5% of the total Se available for plant uptake. The uptake of Se by …
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Aspects of the chemistry of lead in multiphase soil model systems and the environment
… redistribution of Pb in both the three-stage sequential extraction procedure proposed by the Commission of the European Communities Bureau of Reference (BCR, now Standards, Measurements and Testing Programme) (1993) and the commonly-applied procedure of Tessier et al. (1979). Redistribution of …