Determination of cations and anions by capillary electrophoresis combined with suppressed conductivity detection

Avdalović, Nebojša; Pohl, Christopher A.; Rocklin, Roy D.; Stillian, John R.

doi:10.1021/ac00058a027

Cited by 128 publications

(63 citation statements)

References 5 publications

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“…Furthermore, a slow eluter when using IC may be a very fast one when using CE. Avdalovic et al (1993) showed that perchlorate can be eluted by CE at 10 min; meanwhile, bromide, chloride, and iodide all take more than 15 min by their method. Hauser et al (1995) used CE with a micro-ISE to quantitate as little as 10 µM perchlorate.…”

Section: Ion Chromatography and Capillary Electrophoresismentioning

confidence: 99%

Perchlorate Chemistry: Implications for Analysis and Remediation

Urbansky

1998

Bioremediation Journal

475

387

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Abstract:Since the discovery of perchlorate in the ground and surface waters of several western states, there has been increasing interest in the health effects resulting from chronic exposure to low (parts per billion [ppb]) levels. With this concern has come a need to investigate technologies that might be used to remediate contaminated sites or to treat contaminated water to make it safe for drinking. Possible technologies include physical separation (precipitation, anion exchange, reverse osmosis, and electrodialysis), chemical and electrochemical reduction, and biological or biochemical reduction. A fairly unique combination of chemical and physical properties of perchlorate poses challenges to its analysis and reduction in the environment or in drinking water. The implications of these properties are discussed in terms of remediative or treatment strategies. Recent developments are also covered.

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Section: Ion Chromatography and Capillary Electrophoresismentioning

confidence: 99%

Perchlorate Chemistry: Implications for Analysis and Remediation

Urbansky

1998

Bioremediation Journal

475

387

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“…In ion chromatography, very low detection limit at ppb (ng/mL) level can be reached by background depression. Introduction of background depression normally used in ion chromatography was also found effective in CE as demonstrated in the reports [27,28].…”

Section: Capillary Chip Electrophoresis With Conductivity Detectionmentioning

confidence: 97%

On‐column conductivity detection in capillary‐chip electrophoresis

Fang

Josserand

2007

Electrophoresis

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On-column conductivity detection in capillary-chip electrophoresis was achieved by actively coupling the high electric field with two sensing electrodes connected to the main capillary channel through two side detection channels. The principle of this concept was demonstrated by using a glass chip with a separation channel incorporating two double-Ts. One double-T was used for sample introduction, and the other for detection. The two electrophoresis electrodes apply the high voltage and provide the current, and the two sensing electrodes connected to the separation channel through the second double-T and probe a potential difference. This potential difference is directly related to the local resistance or the conductivity of the solution defined by the two side channels on the main separation channel. A detection limit of 15 mM (600 ppb or 900 fg) was achieved for potassium ion in a 2 mM Tris-HCl buffer (pH 8.7) with a linear range of 2 orders of magnitude without any stacking. The proposed detection method avoids integrating the sensing electrodes directly within the separation channel and prevents any direct contact of the electrodes with the sample. The baseline signal can also be used for online monitoring of the electric field strength and electroosmosis mobility characterization in the separation channel.

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“…Similarly to ion-chromatography single-column and the suppressed one, introduction of suppressed conductivity detection to CE allows fot the decrease of the limit of detection for common organic and inorganic ions to the level 1 ± 10 ppb [180,181]. As is shown in Figure 9, the suppressor is made from a short ion-exchange membrane capillary and placed between the separation capillary and the ion-chromatography conductivity detector, with one of the conductivity electrodes being grounded.…”

Section: Conductivity Detection In Cementioning

confidence: 99%

“…Satisfactory functioning of such a detector was shown in the separation of inorganic ions (Fig. 9), carboxylic acids, low mobility of amine cations, and even in partial separation of two isotopes of chlorine [181]. In another approach conductivity detection can be used in a contactless mode.…”

Section: Conductivity Detection In Cementioning

confidence: 99%

“…9. Schematic diagram of suppressed conductivity detector for capillary electrophoresis with suppression made from short ionexchange membrane capillary and electropherogram recorded for mixture of inorgnic ions (10 mM each) [181]. 1) bicarbonate (contaminant), 2) chloride, 3) fluoride, 4) phosphate, 5) chlorate, 6) perchlorate, 7) nitrite, 8) nitrate, 9) sulfate, 10) chloride, 11) iodide, 12) bromide, 13) chromate.…”

Section: Conductivity Detection In Cementioning

confidence: 99%

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Electroanalytical Flow Measurements–Recent Advances

2003

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As general trends in current development of chemical analysis, including electroanalysis, one can indicate a search for methods fast and multianalyte, for miniaturized measuring devices, mechanization and automation of analytical processes. In all these trends a significant role is played by measurements in flow conditions. The major advantage of flow electroanalysis is a possibility of utilizing a kinetic discrimination in potentiometric measurements and enhancement of mass transport in voltammetric techniques. Flow injection techniques provide shortening of time of a single analytical determination due to reproducible use of transient signal from the detector without need of obtaining a steady-state equilibrium signal. Electrochemical detection in HPLC gives often improved selectivity and detection limit for electroactive solutes, whereas in capillary electrophoresis it allows a convenient design of portable, integrated chips for field application. This review presents state-of-the -art of flow electroanalysis based on 226 cited literature references

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Determination of cations and anions by capillary electrophoresis combined with suppressed conductivity detection

Cited by 128 publications

References 5 publications

Perchlorate Chemistry: Implications for Analysis and Remediation

Perchlorate Chemistry: Implications for Analysis and Remediation

On‐column conductivity detection in capillary‐chip electrophoresis

Electroanalytical Flow Measurements–Recent Advances

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