Selective extractions to assess the biogeochemically relevant fractionation of inorganic mercury in sediments and soils - ScienceDirect Analytica Chimica Acta …Web
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Tailings dams, community and garden soil, and stream sediments were further investigated for mercury fractions using a five step sequential extraction procedure.Web
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The highest selective extraction of Hg(II) than As(III) and Fe(III) by TOA in a single-module operation of 79% was obtained at the pH of 2.5. However, the pH values reported by Lothongkum et al. for nickel separation from wastewater of the stainless steel industry by HFSLM [21], and Arpa et al. for mercury separation by ion exchange fromWeb
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The development of a sequential extraction method for mercury in solid environmental samples is presented. The scheme recognizes and quantifies four major phase associations of mercury: "Labile mercury species", "Hg bound to humic and fulvic complexes", "elemental Hg and bound to crystalline oxides" and "Hg sulfide and …Web
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Abstract. 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+) …Web
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A solid phase extraction procedure based on speciation of mercury(II) and methyl mercury on Streptococcus pyogenes immobilized on Dowex Optipore SD-2 has been established. Selective and sequential elution with 0.1 mol L −1 HCl for methyl mercury and 2 mol L −1 HCl for mercury(II) were performed at pH 8. The determination …Web
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Sulfide mercury extraction usually constitutes the last step in Hg-specific sequential extraction methods. Due to its extreme insolubility several authors employ aqua regia or derivatives as extracting agent. ... Labile Hg step was effective and selective to extract the most soluble Hg compounds although part of Hg may be readsorbed to the ...Web
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The CIEMAT 4-step SEP as a new method for mercury extraction in recent years was also investigated. The total recovery of 93– was in accord ... Bloom NS, Preus E, Katon J, Hiltner M (2003) Selective extractions to assess the biogeochemically relevant fractionation of inorganic mercury in sediments and soils. Anal Chim Acta …Web
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Mercury was separated into fractions which "make sense" biogeochemically, rather than being identified by specific compounds. Experiments elucidated the effects of extraction time, solids-to-liquid ratio, and alternate solvents in natural samples, reference materials, and pure compounds. ... Selective extraction procedures [11], [12], ...Web
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Selective, simple, robust and low-cost method was improved. ... Ultrasound-assisted extraction for mercury speciation by the flow injection-cold vapor technique. Journal of Analytical Atomic Spectrometry, 14 (1999), pp. 263-268, 10.1039/A806154H. View in Scopus Google Scholar.Web
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(87.2 to 111%) and good reproducibility (1.1 – 6.5%) were obtained. Such a method is sensitive, selective and accurate, which can be applied to the quantification of mercury species in water samples. Keywords Mercury, speciation analysis, water, high-performance liquid chromatography–atomic fluorescence spectrometry, solid-phase extractionWeb
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Selective extraction of mercury(II) from water samples using mercapto functionalised-MCM-41 and regeneration of the sorbent using microwave digestionWeb
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Trace mercury ion (Hg2+) detection is important for environmental monitoring and water safety. In this work, we study the electrochemical strategy to detect trace Hg2+ based on the preconcentration of temperature-controlled N-octylpyridinium tetrafluoroborate ([OPy][BF4]) dispersive liquid–liquid microextraction. The [OPy][BF4] …Web
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The carrier concentration had marginal effect on extraction as about 91% separation of mercury was achieved without any carrier in the SLM. Even at the most favourable operating condition (viz., 0.3 M NaOH, 4% TOA and pH 1), extraction of mercury was achieved up to 95%. Coconut oil showed better performance in the …Web
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A method for simultaneous preconcentration and determination of mercury species in water and soil samples was established using high-performance liquid chromatography with hydride generation atomic fluorescence spectrometry after ultrasound-assisted dual-cloud point extraction. The extraction process was divided into two steps.Web
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organic mercury fractions may be separated by using a solid-phase extraction procedure. Individual species may be separated and determined by using an HPLC or …Web
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A copolymer of poly (styrene-co-maleic anhydride) was modified with 2-aminobenzimidazole for selective extraction of Hg(II) and CH 3 Hg by ultrasonic-assisted CPE. The extraction was achieved at pH 6.0 for Hg(II) and 4.5 for CH 3 Hg(I). Hg(II) and CH 3 Hg (I) Vinegar samples: UV/Vis: 1–15, and 15–150 μg L −1: 0.31 μg L −1 and 0.30 …Web
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MP-MCM-41 is an extremely efficient and selective sorbent for the removal of mercury (II) from samples of distilled water doped with heavy metal ions and additionally …Web
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@article{osti_932482, title = {Selective extraction of copper, mercury, silver and palladium ionsfrom water using hydrophobic ionic liquids.}, author = {Papaiconomou, Nicolas and Lee, Jong-Min and Salminen, Justin and VonStosch, Moritz and Prausnitz, John M}, abstractNote = {Extraction of dilute metal ions from water was performed near room …Web
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Different techniques have been used for the elimination of mercury from aqueous systems: reverse osmosis [4], coagulation [5], solvent extraction [6], supported liquid membranes (SLM) [7], ion exchange resins [8] and adsorption on solid substrates [9]. Despite the fact that solvent extraction is the most selective method, it is associated …Web
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The extraction of MeHg and inorganic mercury (In-Hg) in fish samples were achieved quantitatively with hydrochloric acid in the presence of thiourea and determined by FI-CCV-AAS. ... The synthesized AuNCs showed high selective for Hg 2+ and the detection limit of Hg 2+ could reach 30 nM in aqueous solution. At the same time, because of its …Web
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Selective recovery of neodymium from oxides by direct extraction method with supercritical Co 2 containing TBP–HNO 3 complex. Separation Science and Technology 2002, 37 (5), 1153-1162.Web
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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 …Web
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This paper presents an assessment of MP-MCM-41 for the selective extraction of Hg (II) in contaminated aqueous solutions. Further, a new method is …Web
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Request PDF | Selective Extraction of Copper, Mercury, Silver, and Palladium Ions from Water Using Hydrophobic Ionic Liquids | Extraction of dilute metal ions from water was performed near room ...Web
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The potential applications of phase (I) for selective extraction of mercury(II) to occur from aqueous solution were successfully accomplished as well as pre-concentration of low concentration of Hg(II) (20 pg ml −1) from natural tap water with a pre-concentration factor of 200 for Hg(II) off-line analysis by cold vapor atomic absorption analysis.Web
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Abstract. We describe a solid phase extractor for selective separation and preconcentration of Hg (II) ion. It was prepared by immobilizing the adduct of …Web
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Selective extraction of copper, mercury, silver, and palladium ions from water using hydrophobic ionic liquids. Industrial & Engineering Chemistry Research, 47 (15) (2007), pp. 5080-5086. Google Scholar [28] S. Dai, Y.H. Ju, C.E. Barnes. Solvent extraction of strontium nitrate by a crown ether using room-temperature ionic liquids …Web
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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 …Web
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Abstract. Silica sorbents, based on mesoporous crystalline material-41 (MCM-41), were functionalised using mercaptopropyl (MP) or diethylenetriamine …Web
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mercury speciation is obvious in these work as well as in a number of applications. In addition to sequential extraction, selective extractions are also used [16-19], especially for methylmercury determination [20]. Furthermore, advanced hyphenated techniques [21] and thermal desorption from the solid phase are used [ 22-26], whichWeb
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The primary purpose of this work is the evaluation of four different selective extraction methods for mercury speciation, namely acid and alkaline leaching followed by solvent extraction and evaporation, microwave-assisted extraction with 2-mercaptoethanol, and acid leaching, solvent extraction and back extraction into …Web
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Mercury extraction from acidic aqueous solutions by the TRUEX process solvent (0.2 M CMPO - 1.4 M TBP in n-dodecane) has not extensively been examined. ... This evaluation resulted in a proposed SBW treatment process which allowed for the concomitant extraction of mercury with the TRUs followed by selective stripping of …Web
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Despite the application of selective for MeHg extraction protocol, partially extracted iHg was also found in the thiosulfate extract. The isotopic equilibrium was achieved not only for MeHg, but also for the iHg, which made possible the quantification of both mercury species with HPLC SS ID ICP-QMS hyphenated techniques.Web
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Relative selective coefficients (k) of the imprinted polymer evaluated from selective binding studies between Hg 2+ and Cu 2+ or Hg 2+ and Cd 2+ were 10 588 and 3 147, respectively. These values ...Web
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Abstract. A procedure is developed for selective extraction of methylmercury (CH 3 Hg +) from heavily Hg-contaminated soils and sediments for …Web
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Selective interaction between phytomediated anionic silver nanoparticles and mercury leading to amalgam formation enables highly sensitive, colorimetric and memristor-based detection of mercuryWeb
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