Solvent Extraction Followed

Accelerated solvent extraction followed by on-line solid ...

Benzalkonium chlorides (BACs) were successfully extracted from sediment samples using a new methodology based on accelerated solvent extraction (ASE) followed by an on-line cleanup step. The BACs were detected by liquid chromatography/ion trap mass spectrometry (LC/MS) or tandem mass spectrometry (MS/MS) using an electrospray interface operated in the positive ion mode. This methodology ...

Solvent Extraction - an overview | ScienceDirect Topics

Strictly chemically, the various steps of solvent extraction, quite often followed by GC analysis, lead to the formation of artifacts in the GC chromatograms, with ghost peaks that do not refer to naturally occurring compounds. Also, the addition of solvent implies its successive removal, which is generally achieved through application of moderate temperature: this of course causes the loss of ...

Pressurized solvent extraction followed by gas ...

2010-06-11· Pressurized solvent extraction followed by gas chromatography tandem mass spectrometry for the determination of benzotriazole light stabilizers in indoor dust. Carpinteiro I(1), Abuín B, Rodríguez I, Ramil M, Cela R. Author information: (1)Departamento de Química Analítica, Nutrición y Bromatología, Instituto de Investigación y Análisis Alimentario, Universidad de Santiago de ...

One-step solvent extraction followed by liquid ...

2015-03-01· A fast and simple analytical method based on a single-step solvent extraction followed by LC–APPI-MS/MS has been developed for the determination of the 16 US EPA priority pollutant PAHs in edible vegetable oils. The LODs and LOQs for the 16 PAHs ranged from 0.006 to 0.129 μg/kg and from 0.02 to 0.43 μg/kg, respectively. The recoveries were in the range of 77.8–106.4 %, and the RSDs were ...

Solvent Extraction Process SX: Hydrometallurgical ...

2017-01-31· It is followed by a gradual clearing of both phases where ultra-fine droplets settle out. If this final clearing does not take place within the settler in a counter-current system it does not materially harm the efficiency of the system. However, the final raffinate must have all the fine solvent removed to avoid excessive solvent loss and the loaded solvent should be free of fine aqueous ...

Solvent Extraction - an overview | ScienceDirect Topics

Solvent extraction is a useful and common technique in many solid sample preparations. The frequency of use of LSE and of Soxhlet extraction in particular compared to other sample preparation techniques is considerable, as shown in Figure 1.1.1. Many extractions are done on the initial sample. However, the extraction also can be done on traps ...

Solvent Extraction - SlideShare

2015-08-17· Multi Stage Counter Current S.E. For extraction of metals on Industrial scale, multi stage counter current solvent extraction process is followed. The aqueous raffinate from one extraction unit is fed to the next unit as the aqueous feed, while the organic solvent flows in the opposite direction, thereby picking up more metal ions in successive contacts. Dividing the organic phase into small ...

SX Solvent Extraction Process Principles Theory

2017-02-01· The potential of solvent extraction is well documented by the wide variety of metal-containing solutions which are amenable to recovery, purification, and concentration by solvent extraction. However, much work in both reagent synthesis and process development remains. Henkel plans to continue as an industry leader in this field via its vigorous research and development program. This program ...

Accelerated solvent extraction followed by on-line solid ...

Benzalkonium chlorides (BACs) were successfully extracted from sediment samples using a new methodology based on accelerated solvent extraction (ASE) followed by an on-line cleanup step. The BACs were detected by liquid chromatography/ion trap mass spectrometry (LC/MS) or tandem mass spectrometry (MS/MS) using an electrospray interface operated in the positive ion mode.

One-step solvent extraction followed by liquid ...

2015-03-01· A fast and simple analytical method based on a single-step solvent extraction followed by LC–APPI-MS/MS has been developed for the determination of the 16 US EPA priority pollutant PAHs in edible vegetable oils. The LODs and LOQs for the 16 PAHs ranged from 0.006 to 0.129 μg/kg and from 0.02 to 0.43 μg/kg, respectively. The recoveries were in the range of 77.8–106.4 %, and the RSDs were ...

Solvent Extraction - an overview | ScienceDirect Topics

Strictly chemically, the various steps of solvent extraction, quite often followed by GC analysis, lead to the formation of artifacts in the GC chromatograms, with ghost peaks that do not refer to naturally occurring compounds. Also, the addition of solvent implies its successive removal, which is generally achieved through application of moderate temperature: this of course causes the loss of ...

Solvent Extraction Process SX: Hydrometallurgical ...

2017-01-31· It is followed by a gradual clearing of both phases where ultra-fine droplets settle out. If this final clearing does not take place within the settler in a counter-current system it does not materially harm the efficiency of the system. However, the final raffinate must have all the fine solvent removed to avoid excessive solvent loss and the loaded solvent should be free of fine aqueous ...

Solid-phase extraction followed by deep eutectic solvent ...

2020-05-25· Solid-phase extraction followed by deep eutectic solvent based dispersive liquid–liquid microextraction and GC-MS detection of the estrogenic compounds in wastewater samples Reza Davoodi , a Ramin Nabizadeh Nodehi , ab Noushin Rastkari , b Ali Akbar Zinatizadeh , c Amir Hossein Mahvi * …

Solvent Extraction - SlideShare

2015-08-17· Multi Stage Counter Current S.E. For extraction of metals on Industrial scale, multi stage counter current solvent extraction process is followed. The aqueous raffinate from one extraction unit is fed to the next unit as the aqueous feed, while the organic solvent flows in the opposite direction, thereby picking up more metal ions in successive contacts. Dividing the organic phase into small ...

Deep eutectic solvent extraction of cortisol and cortisone ...

2021-08-01· Thus, we herein report the development of an extraction and enrichment method for cortisol and cortisone from human saliva samples based on the use of a DES followed by LC-UV analysis. To achieve a suitable extraction efficiency, TAC is employed as a hydrogen bond acceptor for DES preparation, and is mixed with pentafluorophenol (Pfp-OH) as a hydrogen bond donor to obtain a more hydrophobic ...

Exp 6 - Extraction

efficient than a single extraction with the same total volume of solvent. 2. Acid/Base Extraction Organic acids and organic bases can be separated from neutral organic compounds via an acid/base extraction. This type of extraction takes advantage of the fact that most organic acids and bases are soluble in organic solvents while their conjugate acid or conjugate base ions are soluble in water ...

Multistage fractionation of pine bark by liquid and ...

1 天前· Accelerated solvent extraction (ASE) Accelerated solvent extractions (ASE) (Dionex ASE 350) were carried out in triplicate; ... 90 min, equivalent to a solvent-to-sample ratio of 200 g CO 2 g-1 o.d. bark, was fixed for the first extraction, followed by six stages of 45 min each. The total solvent-to-sample ratio achieved after the multistage process was equivalent to 800 g CO 2 g-1 o.d. bark ...

Rapid Extraction of Polycyclic Aromatic Hydrocarbons in ...

2019-06-29· To address these difficulties, ultrasound-assisted solvent extraction followed by microextraction by packed sorbent (UAE-MEPS) was investigated as a novel extraction procedure for the recovery of PAHs from apple, a model of solid vegetal food matrix. The most suitable sorbent and the eluting solvent for PAHs recovery through MEPS were determined. The performances of the whole procedure were ...

Accelerated solvent extraction followed by on-line solid ...

Benzalkonium chlorides (BACs) were successfully extracted from sediment samples using a new methodology based on accelerated solvent extraction (ASE) followed by an on-line cleanup step. The BACs were detected by liquid chromatography/ion trap mass spectrometry (LC/MS) or tandem mass spectrometry (MS/MS) using an electrospray interface operated in the positive ion mode.

Solvent extraction followed by ultraviolet detection for ...

Tetramethylthiuram disulfide is a widely used pesticide and a soil treatment agent in the agricultural sector. Consequently, its detection in the environment and investigation of the distribution between the aqueous and soil phases would be of highly importance. In this study, the detection of tetramethylthiuram disulfide in CHCl3 was successfully achieved through absorbance measurements at ...

Ultrasonic or accelerated solvent extraction followed by U ...

2012-01-15· Ultrasonic or accelerated solvent extraction followed by U-HPLC-high mass accuracy MS for screening of pharmaceuticals and fungicides in soil and plant samples. Chitescu CL(1), Oosterink E, de Jong J, Stolker AA. Author information: (1)University Dunarea de Jos Galaţi-Faculty of Food Science and Engineering, Str. Domnească 47, 800008 Galaţi, Romania. [email protected] PMID ...

Analysis of nitrogenous organic compounds from mainstream ...

Analysis of nitrogenous organic compounds from mainstream cigarette smoke using low-temperature solvent extraction followed by comprehensive two-dimensional gas chromatography with high-resolution time-of-flight mass spectrometry. Xiang Z(1), Cai K(1), Zhou S(2), Geng Z(2), Pan W(1). Author information: (1)Guizhou Academy of Tobacco Science, Guiyang, P. R. China. (2)Key Laboratory of Molecular ...

PRIME PubMed | One-step solvent extraction followed by ...

One-step solvent extraction followed by liquid chromatography-atmospheric pressure photoionization tandem mass spectrometry for the determination of polycyclic aromatic hydrocarbons in edible oils. Anal Bioanal Chem. 2015 May; 407(13):3605-16. AB. Abstract. A method for rapid analysis of 16 polycyclic aromatic hydrocarbons (PAHs) in edible oils has been developed on the basis of a simplified ...

Exp 6 - Extraction

efficient than a single extraction with the same total volume of solvent. 2. Acid/Base Extraction Organic acids and organic bases can be separated from neutral organic compounds via an acid/base extraction. This type of extraction takes advantage of the fact that most organic acids and bases are soluble in organic solvents while their conjugate acid or conjugate base ions are soluble in water ...

Multistage fractionation of pine bark by liquid and ...

1 天前· Accelerated solvent extraction (ASE) Accelerated solvent extractions (ASE) (Dionex ASE 350) were carried out in triplicate; ... 90 min, equivalent to a solvent-to-sample ratio of 200 g CO 2 g-1 o.d. bark, was fixed for the first extraction, followed by six stages of 45 min each. The total solvent-to-sample ratio achieved after the multistage process was equivalent to 800 g CO 2 g-1 o.d. bark ...

Extraction and Cleanup of Acrylamide in Complex Matrices ...

Solvent Extraction Followed by Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS) Application Note 358 Introduction Acrylamide is formed during the cooking process of certain plant-based foods which are rich in carbohydrates and low in protein. Specifically, it forms when asparagine reacts with sugars such as glucose at high temperatures. Acryl- amide was detected in fried foods by the ...

(PDF) Solvent Extraction of Oil and It's Economy | IJSRD ...

Oil press consist of a rotating screw shaft (3) Pressing followed by solvent extraction. Pressing is a (Fig. A.1) within a horizontal barrel. This screw shaft very old method which is replaced by the use of solvent transports the seeds through the screw flight, in order to which is more efficient, especially for oilseeds with lower oil increase the pressure on material during the passage, the ...

ESE Enhanced Solvent Extraction - Separeco

High pressure extractions of polar compounds using supercritical CO2 followed by enhanced solvent extraction (ESE) with diverse CO 2 /ethanol/H 2 O solvent mixtures (0–90%, 0.5–100%, 0–95%, v/v/v), at 313 K and 21 MPa, shows that this ESE solvent mixtures has a substantial effect on extracts yield and composition. Sub sequential extraction, CO 2 only followed by CO 2 + EtOH and finally ...

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