End-column electrochemical detection for inorganic and organic species in high-voltage capillary electrophoresis

Lu, Wenzhe; Cassidy, R. M.; Barański, A.

doi:10.1016/0021-9673(93)80213-r

Cited by 97 publications

(59 citation statements)

References 15 publications

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“…have appeared. [14][15][16][17][18][19][20][21][22][23][24][25][26] The applications of these capillaries in the end-column CE-ECD mode are attractive because problems with clogging or bubble entrapment within the detection zone are minimized. However, in most cases, the working electrode still has to be positioned by means of micropositioners and with the aid of a microscope or simply by following a trial and error procedure.…”

Section: Introductionmentioning

confidence: 99%

A Handy Detection Cell for End-Column Electrochemical Detection in Capillary Electrophoresis

2001

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A handy and simple detection cell was constructed using a mixing joint for end-column electrochemical detection in capillary electrophoresis (CE). The cell allows for positioning of the working electrode at the end of the separation capillary without the aid of micropositioners. The design facilitates the exchange of electrodes and capillaries without the need to refabricate the entire capillary-electrode setup. The cell can be assembled in a short period of time. Alignment with the joint screw proved to be reproducible for working electrodes of copper and gold. The advantages of reduced time and low cost make the device very attractive for the routine analysis of electroactive species, such as carbohydrates and their derivatives, purine bases and nucleosides, amino acids, and catecholamines etc. by CE with electrochemical detection.

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Section: Introductionmentioning

confidence: 99%

A Handy Detection Cell for End-Column Electrochemical Detection in Capillary Electrophoresis

2001

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“…Some way to detect the separated metal ions must be available. This problem was solved by indirect photometric detection (1,2). An organic cation is added to the electrolyte which absorbs in the UV spectral region.…”

Section: Resultsmentioning

confidence: 99%

“…The technique was first reported by Terabe (1,2) and continues to receive considerable attention (3).…”

Section: Introductionmentioning

confidence: 99%

New electrolyte systems for capillary zone electrophoresis of metal cations and non-ionic organic compounds

Shi

1995

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“…In this mode, the electrophoretic mobility of the anions and the EOF will be in the same direction and both will be toward the detector [30]. This mode (negative polarity and reversed EOF) has been used in previous reports of the analysis of small inorganic anions by CE [9,14,18,31]. To achieve the reversed EOF, 1 mM DTAB was added to a 25 mM phosphate buffer, pH 7.5.…”

Section: Negative Polarity Separation Of Chloritementioning

confidence: 99%

“…CEEC has mostly been used to determine organic compounds, e.g., phenolic acids [7,8], catecholamines and amino acids [1]. However, Lu et al [9] used CEEC to detect inorganic ions, such as transition metal ions using a mercury-®lm working electrode and nitrite using a carbon ®ber electrode. Salimi-Moosavi and Cassidy demonstrated the use of nonaqueous CE combined with electrochemical detection for the determination of some inorganic anions (SCN À , N 3 À , I À and NO 2 À ) [13].…”

Section: Introductionmentioning

confidence: 98%

Determination of Chlorite in Drinking Water Using Capillary Electrophoresis with Amperometric Detection

Wallenborg¹,

Dorholt²,

Faibushevich³

et al. 1999

Electroanalysis

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Capillary electrophoresis with end-column electrochemical detection (CEEC) was used to determine chlorite (ClO 2 À ) in drinking water. Two CE methods were developed. The ®rst method used a positive CE polarity with a 25 mM Borate buffer, pH 8.9. The second method used a negative CE polarity and a 25 mM phosphate buffer, pH 7.5 with 1 mM dodecyl trimethyl ammonium bromide (DTAB) added to reverse the EOF. The required detection potential was 1.0 V (vs. Ag/AgCl) in the positive polarity mode and 0.90 V (vs. Ag/AgCl) in the negative polarity mode. In both polarity modes, the analysis time for chlorite was less than 6 minutes. Calibration plots ClO 2 À in tap water and in deionized water were found to be linear between 0.1 and 10 mg L À1 (r 5 0.994) with detection limits of 5 mg L À1 (SaN 3) in both modes. The concentration of chlorite found in samples from a water treatment plant was 0.5 to 1.7 mg L À1 . The relative standard deviation (RSD) in peak height for injections of 1.0 mg L À1 chlorite standards were 5.4 % using the positive polarity mode and 2.7 % using the negative polarity mode. The RSD in peak height for injections of samples from the water treatment plant were 5.2 % and 6.6 % for positive and negative polarity, respectively (n 5).

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End-column electrochemical detection for inorganic and organic species in high-voltage capillary electrophoresis

Cited by 97 publications

References 15 publications

A Handy Detection Cell for End-Column Electrochemical Detection in Capillary Electrophoresis

A Handy Detection Cell for End-Column Electrochemical Detection in Capillary Electrophoresis

New electrolyte systems for capillary zone electrophoresis of metal cations and non-ionic organic compounds

Determination of Chlorite in Drinking Water Using Capillary Electrophoresis with Amperometric Detection

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