A thin-layer contactless conductivity cell for detection in flowing liquids

Mika, Jan; Opekar, František; Coufal, Pavel; Štulı́k, Karel

doi:10.1016/j.aca.2009.07.053

Cited by 9 publications

(9 citation statements)

References 27 publications

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“…A simple planar thin‐layer C 4 D cell for conventional HPLC (and flow‐injection analysis (FIA)) applications was developed by Míka et al . 27 and a C 4 D‐cell for conventional 1.6 mm outer diameter polymeric tubing as used in HPLC was described by Gillespie et al . 108.…”

Section: Broadening Of Scope – C4d In Other Flow‐through Methodsmentioning

confidence: 99%

“…The resulting circuitries in both approaches are very simple and inexpensive, but note that the devices have not been used for detection in CE. Štulík and coworkers gave an account of a cell based on two isolated wires as electrodes, which were inserted into the fluid conduit 26, as well as of a contactless planar thin layer cell 27; however, these cells are not suitable for CE. Wee et al .…”

Section: Fundamental Aspects and New Detector Designsmentioning

confidence: 99%

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Capacitively coupled contactless conductivity detection for microseparation techniques – recent developments

2010

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An overview of the developments of capacitively coupled contactless conductivity detection in CE and related techniques over approximately the last 2 years is given. The method has seen strong growth, and diverse new applications are being reported. Besides more advanced techniques on conventional capillaries, these include further developments of detection on lab-on-chip devices as well as in miniaturized chromatographic systems and some methods not involving separations. An increasing number of reports are based on the now readily available commercial detectors, but, while few publications on fundamental studies have appeared recently, interesting new approaches on creating low cost devices have also appeared.

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Section: Broadening Of Scope – C4d In Other Flow‐through Methodsmentioning

confidence: 99%

Section: Fundamental Aspects and New Detector Designsmentioning

confidence: 99%

Capacitively coupled contactless conductivity detection for microseparation techniques – recent developments

2010

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“…Planar electrodes insulated from the solution by a thin plastic foil have also been used in the thin-layer format of the contactless conductivity detector. The detector was applied to the detection of ionic compounds such as benzoic, lactic and octanesulfonic acids, and sodium capronate, after their separation by high performance liquid chromatography (HPLC) [24]. The properties of the thin-layer detector were compared with those obtained by the standard contactless conductivity detector equipped with tubular electrodes [25].…”

Section: Operational Parameters Of Impedance Cellsmentioning

confidence: 99%

“…In addition, it was found that the tubular cell outperformed the thin-layer cell in the main analytical parameters. A survey of other applications of C 4 D in liquid chromatography is given in reference [24]. …”

Section: Operational Parameters Of Impedance Cellsmentioning

confidence: 99%

Contactless Impedance Sensors and Their Application to Flow Measurements

Opekar

Tůma

Štulı́k

2013

Sensors

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The paper provides a critical discussion of the present state of the theory of high-frequency impedance sensors (now mostly called contactless impedance or conductivity sensors), the principal approaches employed in designing impedance flow-through cells and their operational parameters. In addition to characterization of traditional types of impedance sensors, the article is concerned with the use of less common sensors, such as cells with wire electrodes or planar cells. There is a detailed discussion of the effect of the individual operational parameters (width and shape of the electrodes, detection gap, frequency and amplitude of the input signal) on the response of the detector. The most important problems to be resolved in coupling these devices with flow-through measurements in the liquid phase are also discussed. Examples are given of cell designs for continuous flow and flow-injection analyses and of detection systems for miniaturized liquid chromatography and capillary electrophoresis. New directions for the use of these sensors in molecular biology and chemical reactors and some directions for future development are outlined.

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“…At 50 kHz the LOD of K + and Mg 2+ were 6.4 and 5 μmol·L −1 , respectively (around 10 times less sensitive than LOD average to CE or microchip to these cations). Although other conductivity detectors have been recently described [140], it seems like most LODs are stabilized around theμmol·L −1 range. This indicates that new electronic developments are necessary to increase the applicability of this powerful yet simple detection technique.…”

Section: - Instrumentationmentioning

confidence: 99%

Recent developments in instrumentation for capillary electrophoresis and microchip‐capillary electrophoresis

2010

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Over the last years there has been an explosion in the number of developments and applications of capillary electrophoresis (CE) and microchip-CE. In part, this growth has been the direct consequence of recent developments in instrumentation associated with CE. This review, which is focused on contributions published in the last five years, is intended to complement the papers presented in this special issue dedicated to Instrumentation and to provide an overview on the general trend and some of the most remarkable developments published in the areas of high voltage power supplies, detectors, auxiliary components, and compact systems. It also includes few examples of alternative uses of and modifications to traditional CE instruments.

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A thin-layer contactless conductivity cell for detection in flowing liquids

Cited by 9 publications

References 27 publications

Capacitively coupled contactless conductivity detection for microseparation techniques – recent developments

Capacitively coupled contactless conductivity detection for microseparation techniques – recent developments

Contactless Impedance Sensors and Their Application to Flow Measurements

Recent developments in instrumentation for capillary electrophoresis and microchip‐capillary electrophoresis

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