scholarly journals Porous membrane phase separator in solvent extraction.

1987 ◽  
Vol 3 (6) ◽  
pp. 583-584 ◽  
Author(s):  
Kousaburo OHASHI ◽  
Syozo KOKUBO ◽  
Shohei TAMURA ◽  
Katsumi YAMAMOTO
Keyword(s):  
Solvent Extraction ◽  
Porous Membrane ◽  
Membrane Phase ◽  
Phase Separator

Use of peak height for quantification in solvent extraction/flow injection analysis

1985 ◽  
Vol 63 (9) ◽  
pp. 2559-2563 ◽  
Author(s):  
Jamal A. Sweileh ◽  
Frederick F. Cantwell
Keyword(s):  
Solvent Extraction ◽  
Flow Rate ◽  
Flow Injection Analysis ◽  
Peak Height ◽  
Membrane Phase ◽  
Flow Rates ◽  
Organic Extract ◽  
Sample Concentration ◽  
Band Dispersion ◽  
Phase Separator

The following equation is derived which expresses peak height (P.H.) in terms of sample concentration injected (CSAMP), detector sensitivity (SF), dilution due to band dispersion (Rv), fraction extracted [Formula: see text], flow rates of carrier (FCarrier), organic phase (Fo), and compensating solvent (Fc), and flow rate of organic extract through the membrane phase separator (FM):[Formula: see text]Each term in the equation is evaluated experimentally to validate the equation.

Measurement of self-association and ion-pair dissociation constants by solvent extraction using a membrane phase separator

1982 ◽  
Vol 60 (11) ◽  
pp. 1286-1290 ◽  
Author(s):  
Murray Carmichael ◽  
Frederick F. Cantwell
Keyword(s):  
Solvent Extraction ◽  
Methylene Chloride ◽  
Dissociation Constants ◽  
Extraction Constant ◽  
Ion Pair ◽  
Membrane Phase ◽  
Dimerization Constant ◽  
Self Association ◽  
Phase Separator ◽  
Extraction Isotherms

The "filter-probe" membrane phase separator is used with a gravimetric buret to obtain the following constants at 25 °C by measuring solvent-extraction isotherms: dimerization constant of benzoic acid in chloroform (log K2,HBz = 2.12 ± 0.01); "self-ion-pair extraction" constant of Naloxone into chloroform [Formula: see text]; and ion-pair dissociation constant of tetraethylammonium picrate in methylene chloride (log Kdiss = −4.52 ± 0.09).

scholarly journals Ultrasound-Assisted Solvent Extraction of a Porous Membrane Packed Sample for the Determination of Tobacco-Specific Nitrosamines in the Replacement Liquids for E-Cigarettes

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4618 ◽  
Author(s):  
Paweł Kubica
Keyword(s):  
Solvent Extraction ◽  
Sample Preparation ◽  
Electronic Cigarettes ◽  
Multiple Reaction Monitoring ◽  
Porous Membrane ◽  
Liquid Chromatography Tandem Mass ◽  
Multiple Reaction Monitoring Mode ◽  
Ultrasound Assisted ◽  
Tobacco Specific Nitrosamines

The content of tobacco-specific nitrosamines (TSNAs) possessing carcinogenic properties has been an important area of research since replacement liquids were introduced for e-cigarettes. A method for determining N′-nitrosonornicotine (NNN), 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), N′-nitrosoanatabine (NAT), and N′-nitrosoanabasine (NAB) in replacement liquids for electronic cigarettes was developed using liquid chromatography–tandem mass spectrometry with electrospray ionisation (HPLC-ESI-MS/MS) in the multiple reaction monitoring mode. The sample preparation of replacement liquids was accomplished via the ultrasound-assisted solvent extraction of a porous membrane packed sample. The sample preparation proved to be successful in extracting the analytes, with recoveries from 87% to 105%, with coefficients of variation < 4.9%. Moreover, the linearity and limits of detection and quantitation (LOD, LOQ), together with repeatability and accuracy, were determined for the developed method. The proposed sample preparation and developed chromatographic method were successfully applied to the determination of TSNAs in 9 replacement liquid samples. The NNK and NNN were found to be most frequently detected (89 and 67%, respectively), with concentration ranges from 1.2–54.3 ng/mL and 4.1–30.2 ng/mL, respectively, while NAT was detected with frequency of 22% with range 1.7–2.5 ng/mL and NAB were found to be below the LOD in all samples.

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