Results 81 to 90 of about 2,051 (162)

A novel capillary electrophoretic method for the analysis of dioxins and furans [PDF]

open access: yes, 2005
Micellar electrokinetic chromatography (MEKC) is increasingly popular in the analysis of organic pollutants in the environment due to its high separation efficiency, less solvent usage and shorter analysis time.
Wan Ibrahim, Wan Aini
core  

Achiral and chiral separations using MEKC, polyelectrolyte multilayer coatings, and mixed mode separation techniques with molecular micelles [PDF]

open access: yes, 2010
Mixed mode (MM) separation using a combination of MEKC and polyelectrolyte multilayer (PEM) coatings is herein reported for the separation of achiral and chiral analytes. Many analytes are difficult to separate by MEKC and PEM coatings alone.
Warner, Isiah M., Luces, Candace A.
core   +1 more source

Analysis of hop acids by capillary electrophoresis

open access: yes, 2001
Micellar electrokinetic. chromatography (MEKC) was used to separate components of hop extracts. The separation of a sample of iso-alpha -acids by MEKC was better and faster than by an established HPLC method, giving <0.8 % RSD on migration times and 5-
Gardner, D.S.J.   +7 more
core   +2 more sources

On the utility of simultaneous CO2 and CO observations from GOSAT-2: examining global urban emissions and their socioeconomic characteristics

open access: yesEnvironmental Research Communications
Urban areas are major sources of greenhouse gas (GHG) and air pollutant emissions. Given their substantial potential for mitigation, urban emissions need to be accurately monitored in a timely manner.
Mana Matsuda   +6 more
doaj   +1 more source

MEKC combined with SPE and sample stacking for multiple analysis of pesticides in water samples at the ng/L level

open access: yes, 2007
In this work, a new multiresidue analytical method based on MEKC with UV detection combined with SPE as off-line preconcentration strategy, and reversed-electrode polarity stacking mode (REPSM) as on-line stacking procedure, has been developed for the ...
Ravelo-Pérez, Lidia M.   +3 more
core   +1 more source

A Novel Micellar Electrokinetic Chromatographic Method for Separation of Metal-DDTC Complexes

open access: yesThe Scientific World Journal, 2012
Micellar electrokinetic chromatography (MEKC) was examined for the separation and determination of Mo(VI), Cr(VI), Ni(II), Pd(II), and Co(III) as diethyl dithiocarbamate (DDTC) chelates. The separation was achieved from fused silica capillary (52 cm × 75 
Arfana Mallah   +5 more
doaj   +1 more source

Harnessing electro driven separation technique for the separation of selected agrochemicals

open access: yes, 2008
Electro driven separation techniques offer a different approach to the analysis of complex mixtures than do traditional pressure-driven chromatographic systemit may rely on electrophoresis, the transport of charged species through a medium by an applied ...
Fazril Zayadi
core  

Pesticides Analysis by MEKC ESI/MS and Sulfonamides Analysis by MEKC-CZE ESI/MS

open access: yes, 2013
  氨基甲酸酯類和尿素類農藥因不易帶電,所以大部分文獻常以微胞電層析分離此類中性分析物。然而,當銜接微胞電層析至電灑質譜時,界面活性劑會影響分析物的靈敏度和汙染質譜的離子源。本實驗利用低流速鞘流-液體結合式介面,成功銜接微胞電層析至質譜,藉由控制銜接管的電滲流至小於微胞回退的速度,減少微胞引入質譜而提升農藥分析物的訊號強度(約2~10倍)。搭配質譜/質譜的偵測模式,可成功分離並偵測到十九種農藥分析物。在定量方面,以carbofuran(19種農藥之一)做初步評估,在濃度0.05 ppm到10 ...
Huang, Pei-Chia, 黃珮嘉
core  

On-line preconcentration by analyte focusing micelle collapse in capillary electrophoretic separation of steroids [PDF]

open access: yes, 2014
Analyte focusing by micelle collapse (AFMC) is an on-line sample preconcentration of neutral analyte for capillary electrophoresis (CE). The purpose of this research is to study the separation of six neutral steroids; prednisolone, prednisone ...
Mohamed Khir, Northaqifah Hasna
core  

Analysis of dioxin and furan related compounds and organophosphorous pesticdes using micellar electrokinetic chromatography [PDF]

open access: yes, 2007
Micellar electrokinetic chromatography (MEKC) is increasingly popular in the analysis of organic pollutants in the environment due to its high separation efficiency, less solvent usage and shorter analysis time.
Liew, Sharain Yen Ling
core  

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