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Showing 1 to 20 of 64 for “"Sequential extraction"”.
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Assessment of Arsenic Mobility Using Sequential Extraction and Microscopic Methods
… the activity of microorganisms. In this study, sequential extraction and microscopic methods were used to evaluate arsenic partitioning in different phases in sediments and host rock at the Brinton arsenic mine (BAM) site. Results demonstrate spatial variability of arsenic in sediments, although …
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Sequential extraction of Cu from soil components and Cu-amended soils
… surfaces. Release of Cu from organics after Pb extraction was evaluated using 0.1 M K₄P₂O₇, 5% acetyl acetone, and 5% NaOCl. The former reagent was shown to be most effective, but also to have a solubilizing effect on Mn oxides. In a sequential scheme, therefore, removal of Mn oxideoccluded Cu …
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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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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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Internal Cycling in an Urban Drinking Water Reservoir
… reducible iron, and reducible manganese, using a sequential extraction technique. The results from the study showed moisture contents ranged from 16 to 76% and organic matter contents ranged from 2 to 12 wt%. The dry bulk densities were determined to be between 0.27 and 1.68 g cm3. The average …
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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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Sediment Phosphorus Cycling in a Managed System Irondequoit Bay, N.Y.
… of the sediment cores was determined through sequential extraction. Phosphorus water column data collected during the summer of 2003 and 2004 yielded an average release rate of 8.15 mg P/m2/day. Sediment core incubation experiments yielded an average release rate of 2.89 mg P/m2/day. …
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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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The partitioning and mobility of metals in the Blesbokspruit
… metals are partitioned within the sediment. A sequential extraction was performed on sediment samples from the Blesbokspruit as a method of determining metal partitioning and mobility under various possible environmental conditions. The sequential extraction extracted metals from the following …
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Influence of Biosolids upon the uptake of Mn and Cd by Radish (Raphanus sativus L.)
… through the characterization of biosolids, sequential extraction of the biosolids, and the determination of the metal content in the root, shoot and leaves of radish (<em>Raphanus sativus L</em>.).The biosolid samples from Nacogdoches Wastewater Sludge (NWWS), Lufkin Wastewater Sludge …
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Determination and speciation of mercury in sediment and related samples from Greece and Scotland
… be related to sediment organic matter content. Sequential extraction indicated that Hg speciation - hence mobility - varied between sites. No Hg was detected in the fish Mugil Cephalus indicating no threat to humans from consumption. Total sediment Hg concentrations in the Union Canal ranged …
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An investigation of the distribution, fractionation and bioaccessibility of potentially toxic elements in urban soils of Lagos, Nigeria
… aqua regia digestion, the revised BCR sequential extraction, and the simplified bioaccessibility extraction test (SBET) were applied to the soils. The analytes Cr, Cu, Fe, Mn, Ni, Pb and Zn were determined in soil extracts and digests by ICP-MS.Mean pseudototal PTE concentrations at …
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AQUEOUS EXTRACTION OF OLEOSOMES FROM ISOLATED HULL-ENRICHED AND KERNEL-ENRICHED FRACTIONS OF CANOLA SEED
… This research investigated the aqueous extraction and characterization of oleosomes from whole seed (WS) mechanically separated hull-enriched fractions (HEF) and kernel-enriched fractions (KEF) of InVigor L340PC canola. The work comprised two complementary studies. The first study …
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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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Phosphate-mineral interactions and potential consequences for nutrient cycling
… in the upper sediments to the water column. Sequential Extraction (SEDEX) of the solid-phase associated PO4-3 yielded reservoir profiles of phosphate at three sites off of the Massachusetts coast. These extractions found Fe-associated PO4 to be the dominant phase associated with rapid …
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Phosphate-mineral interactions and potential consequences for nutrient cycling
… in the upper sediments to the water column. Sequential Extraction (SEDEX) of the solid-phase associated P04-3 yielded reservoir profiles of phosphate at three sites off of the Massachusetts coast. These extractions found Fe-associated P04 to be the dominant phase associated with rapid …
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Quantification of complex phosphorus removal reactions occurring within wetland filtration treatment systems
… the various forms of phosphorus in the media, sequential extraction tests were considered to be most relevant and useful for this research. Batch testing and flow cell testing along with sequential extraction tests were conducted to predict the sorption capacity and performance of the media for …
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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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Physical and geochemical characterisation of canal sediments in the Black Country, West Midlands.
… and imaging. The British Geological Survey (BGS) sequential extraction method was used to investigate the different phases in the sediments. pH remained near neutral for all three sites and Redox remained anoxic. Organic contents for all three sites were around 30% and contained most of the …
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The Chemical Forms and Plant Availability of Copper in Composting Organic Wastes
A seven-step sequential extraction scheme was used to track changes in operationally defined copper speciation during the composting of a mixture of grass clippings and sawdust originating from tanalised timber. Starting materials were either unamended or treated with differing amounts of soluble …
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