Selective Subcritical Water Extraction of Aromatic and Aliphatic Organic Pollutants from Petroleum Industry Soils and Sludges Summary The unique properties of subcritical water were investigated in a laboratory study for their ability to selectively remove different organic compound classes from petroleum wastes and petroleum products.
Selective Extraction of Organic Contaminants from Soil Using Pressurised Liquid Extraction Table 2 Amount of silica used to perform selective extraction of PAHs and sterols from soil samples.
Determination of selected organic contaminants in soil by pressurized liquid extraction and gas chromatography tandem mass spectrometry with in situ derivatization. Beatriz Albero Departamento de Medio Ambiente, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Ctra. de la Coruña, Km 7, 28040 Madrid, Spain.
The developed extraction procedures were validated using certified reference material (CRM 041 soil) and applied for analysis of contaminated soil samples. The studies showed that the physical state of waste, initial form and oxidation state of chromium and soil properties influenced the final chromium species and their mobility in soil, which ...
This increases the separation selectivity and facilitated the more accurate determination of speciation forms concentration. By adequate selection of extraction conditions can be realized the selective separation of organic-mineral complexes, which will permit to perform detailed studies about the structure and chemical composition of these.
The observed recycling soil washing effluent method by selective sorption using resins (e.g., SP850) as the adsorbents would be helpful for the application of SER in remediating contaminated soils ...
contaminated soil sites. Size selective membranes could potentially be used to isolate the pesticide solution from the soil particles. Here, micellar capillary electrophoresis was used to separate the pesticide from the soil matrix and quantify its level in the aqueous extraction …
The selective sequential extraction method of analysis is used in this study to determine the distribution of heavy metals in some clay soils, to assist in evaluation of the role of the various clay soil solids (clay minerals, organics, amorphous materials, and carbonates) in heavy-metal retention capability as a function of acidity of the leachate.
Soil organic matter is generally rich in humic acid and fluvic acid. Humic acid is an important ingredient for the extraction of biosurfactant producing actinomycetes. In the present study, humic acid substances used for screening of biosurfactant producing Actinomycetes were extracted by using soil organic …
Extraction of soil and sediment samples was conducted using an orbital shaker (Model DS-500, VWR International, West Chester, PA). Digestion of soils and sediments for total metal analysis was performed using a closed vessel microwave digestion system (CEM Mars5, CEM Co., Mathews, NC). The digestion procedure followed the EPA standard method 3051.
77% into theiron/manganese fraction for soil preparation C, with 22% in organic phase and the balance in the carbonate fraction. Plutonium and americium were extracted from the INEEL soil samples using a Jigand-assisted supercritical fluid extraction technique. ' Initial supercritical fluid extraction- runs produced plutonium
SELECTIVE EXTRACTION OF POLYCYCLIC AROMATIC HYDROCARBONS (PAHs) FROM CONTAMINATED SEDIMENTS USING A HIGH MOLECULAR WEIGHT SURFACTANT. Mickaël Barthe, Émilien Pelletier, Institut des Sciences de la Mer de Rimouski, Université du Québec à ... soil-borne nonpolar organic contaminants and, once fully tested and understood, may provide a ...
that the strains isolated from a highly contaminated soil maintained the capacity to use organic contaminants as metabolic carbon in aqueous extracts from the same soil. The greater biodegradation efficiency of the fungal strain in comparison to M. populi VP2 may be caused by a modification of the A. sydowii VP4 cell surface that increases cell
the extraction efficiency of organic contaminants from solid samples. This technique also uses elevated pressure to keep solvents in a liquid state above their boiling point in order to achieve rapid and reproducible extractions. Recent advances using Accelerated Solvent Extraction Systems include procedures for selective removal of ...
This study focuses on the application of sorbents in Pressurised Liquid Extraction (PLE) cell to establish a selective extraction of a variety of organic contaminants (polycyclic aromatic...
cies from mineral soil, whereas for organic soil, the procedure based on extraction with Na 2CO 3 at room temperature was recommended. The developed extrac-tion procedures were validated using certified reference material (CRM 041 soil) and applied for analysis of contaminated soil samples. The studies showed that
Selective Extraction of Organic Contaminants from Soil Using Pressurised Liquid Extraction Table 4 PAH concentration found in the reference soil CRM1944 (NIST, New York/New Jersey Waterway Sediment), using selective PLE (0.5 g of soil, 5.0 g of silica packed inside the extraction cell, solvent: 𝑛 -hexane, 125°C, 1400 psi, 10 min static ...
removal of organic contaminants from soil at the pilot (20 to 40 kg) scale. Lab-scale studies will be performed to determine the optimum temperature, contact time, and flow rates for removal of the organic contaminants. Initial investigations into using carbon sorbents to clean the extractant water
Abstract. This study focuses on the application of sorbents in pressurised liquid extraction (PLE) cell to establish a selective extraction of a variety of organic contaminants (polycyclic aromatic hydrocarbons (PAHs), chlorpyrifos, phenol, pentachlorophenol, and sterols) from soil.
Mercury Speciation in Contaminated Soils from Old Mining Activities in Mexico Using a Chemical Selective Extraction Irma Gavilán-García,*1,3 Elvira Santos-Santos,1 Luis R. Tovar-Gálvez,3 Arturo Gavilán-García,2 Sara Suárez,1 and Jesús Olmos1 1 Unidad de Gestión Ambiental, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria 04510,
Selective Extraction of Organic Contaminants from Soil Using Pressurised Liquid Extraction Table 1 Effect of various sorbent types on the multiresidual extraction of PAHs, chlorpyrifos, phenol, pentachlorophenol, and sterols from spiked soil.
A procedure is developed for selective extraction of methylmercury (CH 3 Hg +) from heavily Hg-contaminated soils and sediments for determination by chemical vapor generation inductively coupled plasma mass spectrometry (CVG-ICP-MS).Soils artificially contaminated with 40 μg g-1 inorganic mercury (Hg 2+) or methylmercury chloride (CH 3 HgCl) were agitated by shaking or exposing to …
Quantitative and qualitative analyses were done using a dual column gas chromatography-electron capture detection system (GC-ECD) and a GC equipped with a mass spectrometer (MS), respectively. The main contaminants identified comprised of previously used persistent organic pollutants (POPs) and currently used insecticides.
@article{osti_460032, title = {Class-selective extraction of polar, moderately polar, and nonpolar organics from hydrocarbon wastes using subcritical water}, author = {Yang, Y and Hawthorne, S,B. and Miller, D J}, abstractNote = {The polarity of water drops dramatically when heated under enough pressure to maintain the liquid state. For example, the dielectric constant ({epsilon}) of …
The analysis of contaminated soil and sludge samples for semi-volatile organic compounds (SVOC) has traditionally been performed using gas chromatography/mass spectrome-try (GC/MS) (EPA SW-846, Method 8270). This method relies on the extraction of contaminants from the samples utilizing a variety of organic and chlorinated solvents.
Selective extraction of Polycyclic Aromatic Hydrocarbons (PAH) without structural modification of the Natural Organic Matter (NOM) from a heavily contaminated sediment was investigated using various solvents mixtures. Structural modification of the NOM was monitored after extraction using 3D-fluorescence spectroscopy.
Solid-phase extraction (SPE) procedures are used not only to extract traces of organic compounds from environmental samples but also to remove the interfering components of the complex matrices in order to obtain a cleaner extract containing the analytes of interest.
1 Introduction The extraction and recovery of metals from soils and waters is important if the metal is toxic and of commercial value. In some cases metals can simply be recovered by precipitation, but such methods result in problematic separation steps.A solution phase approach that employs either selective complexant hosts or bioremediation is preferable, especially for ions that are present ...
Factors that affect the selective extraction of Pb(II) ions: type of organic solvent and its volume, type of used ligand, counter-ion concentration in the feed solution, pH value of the feed and stripping solution and equilibrium time of extraction, were analyzed.
Field Determination of Organics from Soil and Sludge using Sub-critical Water Extraction Coupled with Solid Phase Extraction EPA Grant Number: R825368 Title: Field Determination of Organics from Soil and Sludge using Sub-critical Water Extraction Coupled with Solid Phase Extraction Investigators: Hawthorne, Steven B. Institution: University of North Dakota
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نشانی: شماره 1688، جاده شرقی گاوک، منطقه جدید پودونگ، شانگهای، چین.
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