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Search: capillary and electrochromatography and amperometric

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CAPILLARY	17,391
ELECTROCHROMATOGRAPHY	497
AMPEROMETRIC	2,488
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In-line coupling capillary electrochromatography with amperometric detection for analysis of explosive compounds
Hilmi, A
IN: ELECTROPHORESIS 2000 APR Vol.21 No.7 Pages 1395 - 1404
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Amperometric detection at a bare gold electrode has been in-line coupled with capillary electrochromatography (CEC) for analysis of nitroaromatic and nitroamine explosives in contaminated soils and ground water. The CEC column packed with 3 mu m C18 particles performed best using a mobile phase containing 70-80% methanol, 30 or 20% water, 5 mM sodium dodecyl sulfate (SDS) and 10mM 2-(N-morpholino)ethanesulfonic acid (MES). In contrast, the separation column packed with 1.5 mu m C18 particles exhibited the best separation when only 30% methanol was added to a mobile phase containing 70% water, 7 mM SDS, and 10 mM MES. The detection, based on electrochemical reduction of the explosives (-0.7 or -1 V vs. Ag/AgCl, depending upon the level of methanol in the mobile phase), was compatible with such mobile phases. The detection limits for 13 explosives ranged from 100 to 200 ppb, i.e., about twofold better than those obtained with electrokinetic chromatography (EKC)/amperometric detection. From an operational viewpoint, exhaustive column conditioning was a prerequisite and care should be taken to prevent bubble formation and current breakdown during the course of separation. The CEC column equipped with amperometric detection successfully measured explosives in ground water and extracts prepared from contaminated soils and the results obtained agreed well with those of the U.S. Environmental protection Agency (EPA) method.
CAPILLARY ELECTROCHROMATOGRAPHY
AMPEROMETRIC DETECTION
EXPLOSIVES
ELECTROCHEMICAL DETECTION
LIQUID-CHROMATOGRAPHY
MU-M
ELECTROPHORESIS
SEPARATION
WATER
TNT
COLUMN
Luong, JHT
RN: 6523969

A FLEXIBLE, SIMPLE, INEXPENSIVE AUTOMATED INSTRUMENT FOR CAPILLARY ELECTROPHORESIS, ELECTROCHROMATOGRAPHY, AND RELATED TECHNIQUES/
DASGUPTA PK
IN: LC GC-MAGAZINE OF SEPARATION SCIENCE 1998 JAN Vol.16 No.1 Pages 44 - &
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This article describes a fully automated instrument that is compatible with various injection techniques for capillary electrophoresis, electrochromatography, and related techniques, The system is modular, which allows the use of many detection techniques, including on-column UV-vis absorbance. The instrument is assembled from readily accessible and relatively inexpensive components. The design of the instrument permits both simple and relatively complex automated protocols for sample and buffer changes, capillary washing steps, and other operations. Users of the system can perform unique applications such as gas sampling from a film and exhaustive electromigration from a finite small volume.
FLOW-INJECTION ANALYSIS
ZONE ELECTROPHORESIS
AMPEROMETRIC DETECTION
METAL-IONS
SAMPLE INTRODUCTION
SEPARATION
SYSTEMS
LOOP
SUROWIEC K,
RN: 4374336