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Sorption, desorption and extraction of uranium from

2006-12-1 · Sorption, desorption and extraction behavior of uranium in various fluvial sands of domestic origin were investigated in continuous dynamic column experiments. For the sorption of U(VI) an aqueous 10 -4 M UO 2 (NO 3 ) 2 solution was used at a flow rate of about 0,3 cm 3 /min. Desorption was carried out with demineralized water, and the extraction with 10-2M

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Fiber depth, column coating and extraction time are

2017-11-9 · The aims of this research were to systematically study how extraction, desorption and gas chromatography (GC) parameters affect the volatiles composition o Fiber depth, column coating and extraction time are major contributors in the headspace solid-phase microextraction–gas chromatography analysis of Nordic wild mushrooms | SpringerLink

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Column chromatographic extraction and preparation

2009-7-15 · We have developed a new column chromatographic extraction (CCE) method for the extraction of cordycepin from this waste and a preparation method for further separation and purification. Dried waste material was imbibed in four times its volume of water for 6 h, transferred to columns and eluted with water.

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Desorption - an overview | ScienceDirect Topics

Desorption of Analytes and Conditioning of the SPME Fiber. The desorption process in SPME can be done in the injection port of a GC system or less frequently in a solvent (e.g., for HPLC analysis). The use of SPME for the direct transfer of the adsorbed compounds into the GC injection port and the selective adsorption capacity of the fiber coating that prevents oxygen and moisture from getting into the GC column

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A New Approach for Atrazine Desorption, Extraction

2014-3-6 · A New Approach for Atrazine Desorption, Extraction and Detection from a Clay-Silty Soil Sample. This paper reports an alternative method for extraction, detection and quantification of atrazine from a clay-silty soil. Atrazine adsorption isotherm for this kind of soil fits to a Freundlich adsorption isotherm with a correlation coefficient of 0.994, ...

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Separation and extraction of antimicrobial

2010-4-8 · Dynamic adsorption and desorption experiments were performed using a column packed with X-5 resin to obtain optimal conditions, with 30 g/L resin concentration, 0.5 BV/h feed flow rate, 80% aqueous ethanol at 1 BV/h elute flow rate as eluant agent, the total content of lipopeptides in final product was 79.5% (surfactin content was 33.2% while fengycin content was 23.4%), which had been

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Extraction and purification of ustiloxin A from rice

2020-12-8 · The MR column saturated by UstA was used for dynamic desorption. The column was first washed with 1 BV of 5% methanol solution to remove water-soluble impurities. The eluting solvent (40% aqueous methanol) was then pumped into the MR column at a flow rate of 2.0 BV/h, and the eluting solution was fractionally collected and analyzed by HPLC.

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Modeling of the static batch desorption and dynamic

The pore diffusion model (PDM) considering counter ion was established to describe the desorption/elution kinetics in the batch/column experiment. By the least square fitting method, the superficial desorption rate constant K d of GSA/HCl reaction on the ion-exchange sites of porous resin was fitted to 0.116 L/(mol s). Subsequently, this value was sequentially applied in the simulation of the

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Difference Between Adsorption and Desorption |

2020-2-2 · In chromatography, the desorption is the process that aids the movement of the mobile phase. After desorption occurs, the desorbed substance remains on the substrate nearly indefinitely if the temperature remains low. However, when the temperature rises, desorption is likely to occur. The general equation for the rate of desorption is as follows.

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Sorption, desorption and extraction of uranium from

Sorption, desorption and extraction behavior of uranium in various fluvial sands of domestic origin were investigated in continuous dynamic column experiments. For the sorption of U(VI) an aqueous 10 -4 M UO 2 (NO 3 ) 2 solution was used at a flow rate of about 0,3 cm 3 /min. Desorption was carried out with demineralized water, and the extraction with 10-2M Na2CO3 ...

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Sorption, desorption and extraction of uranium from

2006-6-13 · Sorption, desorption and extraction behavior of uranium in various fluvial sands of domestic origin were investigated in continuous dynamic column experiments. For the sorption of U(VI) an aqueous 10−4M UO2(NO3)2 solution was used at a flow rate of about 0,3 cm3/min. Desorption was carried out with demineralized water, and the extraction with 10−2M Na2CO3 solution following desorption. The ...

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Extraction Combined with Thermal Desorption-GC/MS

2021-7-20 · thermal desorption, direct thermal extraction and Stir ... To achieve more mass on column and better sensitivity, the Multi-Desorption Mode feature within the GERSTEL Maestro software was used, desorbing and concentrating analytes from multiple Twisters for each GC/MS run.

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Extraction and purification of ustiloxin A from rice

2020-12-8 · The MR column saturated by UstA was used for dynamic desorption. The column was first washed with 1 BV of 5% methanol solution to remove water-soluble impurities. The eluting solvent (40% aqueous methanol) was then pumped into the MR column at a flow rate of 2.0 BV/h, and the eluting solution was fractionally collected and analyzed by HPLC.

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Application of stir bar sorptive extraction in

2001-6-1 · The new technique of stir bar sorptive extraction (SBSE) using stirrers 10 mm long coated with 55 μl polydimethylsiloxane (PDMS) was used to determine polycyclic aromatic hydrocarbons (PAHs) from water samples.The desorption of the extracted analytes was performed with ultrasonic treatment in autosampler vials with glass flat bottom inserts using 150 μl of acetonitrile (ACN) or an ACN ...

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Mining Equipment For Cyanide Leaching Process

Mining Equipment For Cyanide Leaching Process Desorption Copper Silver Gold Desorption Column , Find Complete Details about Mining Equipment For Cyanide Leaching Process Desorption Copper Silver Gold Desorption Column,Electrowinning And Desorption,Desorption Column,Copper Silver Gold Electrowinning Machine from Other Mining Machines Supplier or Manufacturer-Yantai Jinpeng Mining

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Examples for the Design of Packed Columns

2015-6-28 · Thus the column diameter can be calculated from the operating parameters V [kmol/h], uv [m/s], T [K], and p [bar], i. e. ds = 5.4 • 1(T3 \l V — — (14-28) 17 p Uy Fig. 14.3 illustrates liquid-liquid extraction in which the specific gravity of the continuous phase (Subscript C) is greater than that of the dispersed phase (Subscript D). In ...

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Separation and extraction of antimicrobial

2010-4-8 · A new method for separation and extraction of antibiotic lipopeptides produced by Bacillus amyloliquefaciens ES-2 with macroporous resin was carried out in this study. Among widely used twelve macroporous resins, X-5 resin had the highest adsorption capacity in static and dynamic tests, its non-polarity and configuration were suited for the lipopeptides (surfactin and fengycin). Dynamic ...

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Direct Thermal Extraction Analysis of Solid and Liquid ...

2021-7-14 · Direct thermal extraction (DTE) is a thermal desorption technique in which a small amount of sample, typically 10-50 mg, is placed in an empty fritted thermal desorption tube or into a small vial (μ-vial) within an empty thermal desorption tube. The sample is then heated in a thermal desorption

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Difference Between Adsorption and Desorption |

2020-2-2 · The key difference between adsorption and desorption is that adsorption refers to the process by which some solids hold the molecules of a gas or liquid or solute as a thin film, whereas desorption refers to the release of an adsorbed substance from a surface.. Adsorption and desorption are chemical processes that are opposite to each other. We can observe these processes in many biological ...

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Sorption, desorption and extraction of uranium from

2006-6-13 · Sorption, desorption and extraction behavior of uranium in various fluvial sands of domestic origin were investigated in continuous dynamic column experiments. For the sorption of U(VI) an aqueous 10−4M UO2(NO3)2 solution was used at a flow rate of about 0,3 cm3/min. Desorption was carried out with demineralized water, and the extraction with 10−2M Na2CO3 solution following desorption. The ...

Read More
Extraction Combined with Thermal Desorption-GC/MS

2021-7-20 · thermal desorption, direct thermal extraction and Stir ... To achieve more mass on column and better sensitivity, the Multi-Desorption Mode feature within the GERSTEL Maestro software was used, desorbing and concentrating analytes from multiple Twisters for each GC/MS run.

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Resins for Reverse-Phase Chromatography, Adsorption

2021-3-31 · If the column conditions favour adsorption of a molecule, then the molecule will adhere to the stationary phase and be separated from the other sample chemicals. When the conditions favour desorption, the opposite will happen — and the chemicals will be released into the mobile phase. Solid phase extraction is an extractive technique by which

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Thermal Desorption Unit TDU 2 - SRA Instruments

The Thermal Desorption Unit (TDU 2) is a flexible automated solution for thermal desorption and thermal extraction. The TDU 2 fits on top of any modern GC without the need for additional bench space and it is perfectly suited for the analysis of gaseous, liquid and solid samples. The TDU 2 incorporates the latest advances in thermal desorption ...

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Examples for the Design of Packed Columns

2015-6-28 · Thus the column diameter can be calculated from the operating parameters V [kmol/h], uv [m/s], T [K], and p [bar], i. e. ds = 5.4 • 1(T3 \l V — — (14-28) 17 p Uy Fig. 14.3 illustrates liquid-liquid extraction in which the specific gravity of the continuous phase (Subscript C) is greater than that of the dispersed phase (Subscript D). In ...

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Mining Equipment For Cyanide Leaching Process

Mining Equipment For Cyanide Leaching Process Desorption Copper Silver Gold Desorption Column , Find Complete Details about Mining Equipment For Cyanide Leaching Process Desorption Copper Silver Gold Desorption Column,Electrowinning And Desorption,Desorption Column,Copper Silver Gold Electrowinning Machine from Other Mining Machines Supplier or Manufacturer-Yantai Jinpeng Mining

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Separations | Free Full-Text | Development,

Contrary to one-stage desorption, in two-stage TD, after the first stage desorbs all volatile and semi-volatile compounds from the extraction phase, the second stage is used to pre-focus analytes before their introduction into the analytical column.

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Direct Thermal Extraction Analysis of Solid and Liquid ...

2021-7-14 · Direct thermal extraction (DTE) is a thermal desorption technique in which a small amount of sample, typically 10-50 mg, is placed in an empty fritted thermal desorption tube or into a small vial (μ-vial) within an empty thermal desorption tube. The sample is then heated in a thermal desorption

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A breakthrough in automated sample extraction and ...

2020-9-10 · sample extraction & enrichment platform lets you Discover more and Deliver more. HiSorb™ high-capacity sorptive extraction Fully automated immersive or headspace sampling of liquids and solids. 1 SPME–trap Fast and sensitive sample extraction, with a range of selective fiber types. 2 Thermal desorption and direct thermal extraction

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Method And Principle Of Solid Phase Extraction Column

2020-4-8 · The adsorbents used in normal solid phase extraction are polar and are used to extract (retain) polar substances.Target when positive phase extraction using c18 solid phase extraction small column compound how to keep on the adsorbent, depend on

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