Tìm thấy 13+ kết quả cho từ khóa "Liquid–liquid extraction"
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Spectrophotometric determination of molybdenum using surfactant-mediated liquid–liquid extraction. Abstract: A new spectrophotometric method has been developed for determination of molybdenum using surfactant- mediated liquid–liquid extraction.
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Separation and recovery of gallium(III) ions from aqueous phase by liquid–liquid extraction using a novel extractant, Cyphos IL 101. Abstract: The present study describes the extraction behavior of gallium(III) using a novel ionic liquid trihexyl(tetradecyl) phosphonium chloride (Cyphos IL 101) diluted with kerosene from acidic chloride medium.
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Ion-pair based liquid–liquid extraction of gold(III) from malonate media using 2-octylaminopyridine as an extractant: analysis of alloys, minerals, and drug. Abstract: Liquid–liquid extraction of Au(III) from aqueous sodium malonate medium using 2-octylaminopyridine (2-OAP) as an extractant in xylene was achieved.
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Ultrasonic energy has been used as a powerful assistant in the acceleration of processes such as homog- enization, formation of emulsion, and mass transfer between immiscible phases in separation and extraction procedures. 32,33 Ultrasound-assisted liquid–liquid extraction and ultrasound-assisted emulsification extraction procedures have been successfully used as the substitute of liquid–liquid extraction and in these methods the extraction equilibrium is attained in a short time.
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The proposed green analytical extraction method was applied to the analysis of tetracycline antibiotics in milk and honey samples with recovery of 50%–110% and 68%–117%, respectively.. 6 − 8 Before chro- matographic analysis, separation and preconcentration of tetracyclines in food samples have been accomplished by different extraction techniques like liquid–liquid extraction 9 and solid-phase extraction.
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In the present discussion we will emphasize two methods used most often in most HPLC laboratories: liquid–liquid extraction (Section 16.5) and liquid–solid or solid–phase extraction (Section 16.6).. 16.5 LIQUID–LIQUID EXTRACTION. analytes extracted into the aqueous phase often can be injected directly onto a RPC column. similar approaches can be used when the analyte is extracted into the aqueous phase.. Figure 16.1 Summary of the steps involved in liquid-liquid extraction (LLE)..
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An example of the use of SDME is the RPC analysis of hypercins in plasma and urine [18]. 16.5.4.3 Solid-Supported Liquid–Liquid Extraction (SLE). Because there is no vigorous shaking of the sample and extraction solvent, as in conventional LLE, there is no possibility of emulsion formation. 16.5.4.4 Immobilized Liquid Extraction (ILE). The polymeric film can be applied to the cap of a vial, the inner walls of a 96-well plate, or inside a micropipette tip.
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LLE Liquid–liquid extraction
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Our study focused on selective and effective extraction of heavy metals and precious metals from solution and determining the extraction behavior of macrocycles in liquid–liquid medium. The thermodynamic parameters for the extracted complex compositions in liquid–liquid extraction are also investigated.. The N-pivot lariat ether 2 and macrobicyclic ligand 3 containing nitrogen, sulfur, and oxygen donors were pre- pared by the route shown in the Scheme.
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LGC Laboratory of the Government Chemist LLE liquid–liquid extraction. To be aware of the information required for a desk-top study (in a contam- inated land situation).. To be aware of the different types of contaminant distribution on a site.. To be aware of the different analytical techniques available to analyse organic compounds.. To be aware of the approaches and limitations for sample pre-concentration in the analysis of organic compounds..
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capability of TXRF, 10 recent precon- centration strategies used in combination with TXRF have focused on the use of nanomaterials as well as liquid phase microextraction (LPME) procedures. 11 LPME is a solvent-miniaturized sample pretreatment procedure of the conventional liquid–liquid extraction (LLE) in which only several microliters of solvent are required to concentrate analytes rather than hundreds of milliliters needed in traditional LLE. 12 Since its development in the mid-to-late 1990s,
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For example, the determination of drugs in plasma often involves solid-phase or liquid–liquid extraction with variable volume recovery, evaporation to dryness, and reconstitution in the injection solvent. calculations of analyte concentration are based on the ratio of areas for the analyte and IS. Aliquots of the calibration standards (e.g., 200 μL of spiked plasma) are then mixed with an IS solution (e.g., 10 μL), as are all samples—standards and samples are then processed in the same way.
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Extraction studies were carried out using an aqueous solution of Na 2 Cr 2 O M) and the calixarene derivative M solution of 3 in CH 2 Cl 2 for liquid–liquid extraction, 25 mg of MN-DiNoPy-Calix (4) for solid–liquid extraction). A mixture of Na 2 Cr 2 O 7 (10 mL M) and the calixarene derivative (10 mL M solution in CH 2 Cl 2 for liquid–liquid extraction, 25 mg of MN-DiNoPy-Calix (4) for solid–liquid extraction) was shaken in a stoppered flask at 175 rpm at 25 ◦ C for 1 h.
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Multiple objective optimization of air assisted liquid-liquid microextraction combined with solidified floating organic drop microextraction for simultaneous determination of. The preconcentration and determination of metal ions in aqueous solutions have been evaluated by several techniques such as solid phase extraction (SPE), liquid-liquid extraction (LLE) and micelle mediated cloud point extraction (CPE) [7,8].
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Liquid–Liquid Extraction (SLE), 770. 16.5.4.4 Immobilized Liquid Extraction (ILE), 770. 16.6 Solid-Phase Extraction (SPE), 771. 16.6.1 SPE and HPLC Compared Uses of SPE, 772. 16.6.2.1 Interference Removal Analyte Enrichment Desalting, 774. 16.6.2.4 Other Applications SPE Devices, 774. 16.6.3.1 Cartridges Disks, 775. 16.6.3.3 Other SPE Formats SPE Apparatus, 777. 16.6.5 SPE Method Development SPE Steps SPE Packings, 781. 16.6.6 Example of SPE Method Development:. 16.6.7 Special Topics in SPE, 785
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For this reason, a great many articles devoted to dispersive liquid–liquid microextraction and dispersive liquid–phase microextraction as well as their modalities for the determination of both organic and inorganic analytes have recently published. dispersive liquid–liquid microextraction (DLLME), 15,16 ionic liquid–based dispersive liquid–liquid microextrac- tion (IL–DLLME), 17 dispersive liquid–liquid microextraction based on solidification of floating organic drop (DLLME–SFO), 18 surfactant–assisted
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Dispersive liquid-liquid microextraction of parabens from pharmaceuticals and personal care products prior to their determination using HPLC-DAD. Abstract: Dispersive liquid–liquid microextraction followed by a back-extraction step was combined with HPLC-DAD for the determination of four parabens (i.e. Optimum extraction conditions were found as follows: 225 µ L of chloroform, 0.75 mL of ethanol, 7.5 mL of aqueous solution and within an extraction time of 15 s.
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Ultra-trace determination of Sudan I, II, III, and IV in wastewater by solid-phase microextraction (SPME) and on-line solid-phase extraction (SPE) with high-performance liquid chromatography (HPLC). Extraction and determination of synthetic food dyes using tetraalkylammonium based liquid- liquid extraction. Dispersive liquid-liquid microextraction combined with high-performance liquid chromatography for the enrichment and sensitive determination of Sudan Red pollutants in water samples.
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Speciation of chromium by the combination of dispersive liquid–liquid. Abstract: A microextraction procedure was established for the speciation of total Cr, Cr(III), and Cr(VI). Sudan blue II was used as a ligand for speciation works. Some factors affecting the recoveries of chromium species, including type of extraction and dispersive solvents, pH, ligand amount, extraction time, and matrix ions, were examined.
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An initial solid-liquid extraction (SLE) was carried out by weighing g of the sample and extracting it with 50.0 mL of 50/50. A portion of 5.0 mL of the sample solution was mixed with 2.0 mL of saturated sodium chloride solution. Out of the 1.2 mL of acetonitrile that salted out, 1.0 mL was used in DLLME.. A portion of the aqueous extract (i.e. Type and volume of the extraction solvent. Volume of the selected solvent can significantly influence the extraction efficiency [21].