Enantiomeric Fraction Determination of 2-Arylpropionic Acids in a Package Plant Membrane Bioreactor

Chirality ◽  
2013 ◽  
Vol 25 (5) ◽  
pp. 301-307 ◽  
Author(s):  
Nor H. Hashim ◽  
Richard M. Stuetz ◽  
Stuart J. Khan
Keyword(s):  
Membrane Bioreactor ◽  
Enantiomeric Fraction ◽  
Fraction Determination

Comparison of peak integration methods for the determination of enantiomeric fraction in environmental samples

Chemosphere ◽  
2009 ◽  
Vol 75 (8) ◽  
pp. 1042-1048 ◽  
Author(s):  
Brian J. Asher ◽  
Lisa A. D’Agostino ◽  
Jenilee D. Way ◽  
Charles S. Wong ◽  
James J. Harynuk
Keyword(s):  
Environmental Samples ◽  
Integration Methods ◽  
Peak Integration ◽  
Enantiomeric Fraction

Volume fraction determination of the annular three-phase flow of gas-oil-water using adaptive neuro-fuzzy inference system

2018 ◽  
Vol 37 (4) ◽  
pp. 4321-4341 ◽  
Author(s):  
Gholam Hossein Roshani ◽  
Alimohammad Karami ◽  
Ehsan Nazemi ◽  
Farzin Shama
Keyword(s):  
Fuzzy Inference ◽  
Volume Fraction ◽  
Gas Oil ◽  
Inference System ◽  
Neuro Fuzzy ◽  
Three Phase ◽  
Three Phase Flow ◽  
Oil Water ◽  
Fraction Determination

scholarly journals Gas Chromatography Multiresidue Method for Enantiomeric Fraction Determination of Psychoactive Substances in Effluents and River Surface Waters

Chemosensors ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 224
Author(s):  
Ivan Langa ◽  
Maria Elizabeth Tiritan ◽  
Diana Silva ◽  
Cláudia Ribeiro
Keyword(s):  
Gas Chromatography ◽  
Surface Waters ◽  
Wastewater Treatment Plants ◽  
Solid Phase ◽  
River Estuary ◽  
Psychoactive Substances ◽  
Amphetamine Derivatives ◽  
First Time ◽  
Fraction Determination

Determination of psychoactive substances (PAS) and/or their metabolites in surface waters is crucial for environmental risk assessment, and disclosure of their enantiomeric fractions (EF) allows discrimination between consumption, direct disposal, and synthesis pathways. The aim of this study was to develop and validate an indirect method by gas chromatography coupled to mass spectrometry (GC–MS) based on derivatization using (R)-(−)-α-methoxy-α-(trifluoromethyl) phenylacetyl chloride as chiral derivatization reagent, for enantiomeric quantification of amphetamine (AMP), methamphetamine (MAMP), 3,4-methylenedioxymethamphetamine (MDMA), norketamine, buphedrone (BPD), butylone, 3,4-dimethylmethcathinone (3,4-DMMC), 3-methylmethcathinone, and quantification of 1-benzylpiperazine and 1-(4-metoxyphenyl)-piperazine. The method allowed to evaluate the occurrence, spatial distribution, and the EF of the target chiral PAS in Portuguese surface waters and in effluents from 2 wastewater treatment plants (WWTP). For that, water samples were pre-concentrated by solid phase extraction using OASIS® MCX cartridges, derivatized and further analyzed by GC–MS. Both enantiomers of AMP, (R)-MDMA, (S)-MAMP, and the first eluted enantiomer of BPD (configuration not assigned) were found in surface waters, while effluent samples showed both enantiomers of MDMA, (S)-MAMP, (R)-AMP, and the first eluted enantiomer of BPD and 3,4-DMMC. According to our knowledge, this is the first multiresidue analytical method by CG–MS enrolling cathinones, amphetamines, and piperazines. The presence of illicit synthetic cathinones in Douro River estuary is here reported for the first time, along with other amphetamine derivatives. The potential of the method to monitor consumption of the target PAS was demonstrated.

A Rapid Fluorescence and Energy Powder Pattern Analysis System

1972 ◽  
Vol 16 ◽  
pp. 298-309
Author(s):  
Wen Lin
Keyword(s):  
Diffraction Pattern ◽  
Elemental Analysis ◽  
Emission Lines ◽  
Powder Pattern ◽  
Phase Identification ◽  
X Rays ◽  
Fluorescent Spectrum ◽  
Analysis System ◽  
Fraction Determination

AbstractReported here is a computer-coupled energy dispersive x-ray system capable of performing rapid elemental analysis and phase identification employing fluorescence and energy powder pattern analyses, The system consists of a Si(Li) detector, commercial diffractometer, vacuum specimen chamber with fluorescsnce geometry and a multichannel analyzer interfaced to a laboratory computer.The continuous radiation is used to excite both fluorescent x-rays and Bragg reflections. The diffractometer spectrum obtained with a fixed 2θ setting gives the crystalline diffraction pattern plus the detectable emission lines. With the fluorescence geometry, the system is capable of detecting the characteristic x-rays of the elements down to Na. The fluorescent spectrum can be used to separate the diffraction peaks from the emission lines in the diffractometer spectrum. Furthermore, the fluorescent spectrum can be used for qualitative or/and quantitative elemental analysis.Software was developed for element recognition, to isolate the diffraction pattern from emission lines, d-spacing calculations, as well as matrix corrections and mass fraction determination of elements in quantitative analysis.

scholarly journals Volume Fraction Determination of Binary Liquid Mixtures by Measurement of the Equalization Wavelength

Sensors ◽  
2010 ◽  
Vol 10 (8) ◽  
pp. 7082-7088 ◽  
Author(s):  
Ivan Martincek ◽  
Dusan Pudis ◽  
Daniel Kacik ◽  
Kay Schuster
Keyword(s):  
Volume Fraction ◽  
Liquid Mixtures ◽  
Binary Liquid Mixtures ◽  
Binary Liquid ◽  
Fraction Determination
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